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  Subjects -> ENGINEERING (Total: 2270 journals)
    - CHEMICAL ENGINEERING (191 journals)
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    - ELECTRICAL ENGINEERING (99 journals)
    - ENGINEERING (1199 journals)
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ENGINEERING (1199 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 216)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 19)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 8)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 38)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 177)
Composites Part B : Engineering     Hybrid Journal   (Followers: 222)
Composites Science and Technology     Hybrid Journal   (Followers: 165)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 41)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  

        1 2 3 4 5 6 | Last

Journal Cover Applied Catalysis B: Environmental
  [SJR: 2.322]   [H-I: 158]   [8 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0926-3373
   Published by Elsevier Homepage  [3031 journals]
  • High hexitols selectivity in cellulose hydrolytic hydrogenation over
           platinum (Pt) vs. ruthenium (Ru) catalysts supported on micro/mesoporous
           carbon
    • Authors: P.A. Lazaridis; S.A. Karakoulia; C. Teodorescu; N. Apostol; D. Macovei; A. Panteli; A. Delimitis; S.M. Coman; V.I. Parvulescu; K.S. Triantafyllidis
      Pages: 1 - 14
      Abstract: Publication date: 5 October 2017
      Source:Applied Catalysis B: Environmental, Volume 214
      Author(s): P.A. Lazaridis, S.A. Karakoulia, C. Teodorescu, N. Apostol, D. Macovei, A. Panteli, A. Delimitis, S.M. Coman, V.I. Parvulescu, K.S. Triantafyllidis
      The “one-pot” hydrolyltic hydrogenation of cellulose towards C2-C6 sugar alcohols has been recognized as one of the most promising biomass valorization routes for the production of high added-value chemicals. In this work, we studied the performance of Ru and Pt catalysts supported on micro/mesoporous activated carbon, in the hydrolytic hydrogenation of microcrystalline and ball-milled cellulose, in neat water, at 180°C and at relatively low hydrogen pressure of 2MPa. The impact of metal loading (1–5wt.%), metal reduction method (H2 at 350°C or NaBH4) and acidification (sulfonation) of the AC support on cellulose conversion and selectivity to the various products were systematically addressed. It was shown that Pt is significantly more selective towards hexitols (sorbitol and mannitol) compared to Ru, in glucose-rich reaction media, such as those offered by the easily hydrolyzed ball-milled cellulose. For example, the 5wt%Pt/AC-SO3H catalyst afforded hexitols yield of 69.5wt.% (at 96.1% conversion) compared to 10.9wt.% (at 95.2% wt.% conversion) obtained by the corresponding Ru catalyst, the latter being also selective towards glycerol and propane-1,2-diol (propylene glycol). A relatively moderate metal loading, such as in 3wt.%Ru/AC-SO3H, was more favorable for hexitols production (44.5wt.% yield, at 94.8wt.% conversion) with Ru catalysts. These results were also verified by glucose hydrogenation experiments that were conducted at the same experimental conditions. Both Pt and Ru exhibited relatively high glucose hydrogenation activity towards hexitols, versus retro-aldol reactions that lead directly to smaller C2–C4 compounds, while the difference in the final product yields between the two metals was attributed to the higher hexitols hydrogenolysis (CC cleavage) reactivity of Ru. HRTEM data showed the formation of metallic crystalline Pt and Ru nanoparticles (≤4nm, depending on loading) as well as of amorphous oxygen-rich M(O)x δ+ phases, which were also confirmed by the XPS data. The presence of these phases which may be a source of acidity, as well as the bacisity of the parent AC used in this study, were mainly responsible for inducing isomerization, retro-aldol and dehydration reactions leading eventually to increased glycerol and propylene glycol selectivity, as was observed for both low-metal catalysts, i.e. 1wt.% Pt or Ru/AC.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.031
      Issue No: Vol. 214 (2017)
       
  • Size-dependent plasmonic effects of M and M@SiO2 (M=Au or Ag) deposited on
           TiO2 in photocatalytic oxidation reactions
    • Authors: Ji Eun Lee; Sandipan Bera; Young Sik Choi; Wan In Lee
      Pages: 15 - 22
      Abstract: Publication date: 5 October 2017
      Source:Applied Catalysis B: Environmental, Volume 214
      Author(s): Ji Eun Lee, Sandipan Bera, Young Sik Choi, Wan In Lee
      Monodispersed Au nanoparticles (NPs) with sizes of 18, 26 and 34nm and Ag NPs with sizes of 17, 25 and 33nm, as well as their corresponding M@SiO2 core-shell NPs (M=Au or Ag), were selectively synthesized. The prepared individual plasmonic NPs were then loaded onto TiO2 and their size-dependent plasmonic effects in photocatalytic oxidation reactions were systematically analyzed. In the removal reactions of the organic compounds, aqueous salicylic acid (SA) and aniline, under UV–vis light irradiation, both the Au and Ag NPs significantly enhanced the catalytic activity of TiO2, while the smaller NPs were more effective. Although the Ag NPs show stronger LSPR effect than the Au NPs, the overall catalytic activity of the Ag/TiO2 systems was not higher than Au/TiO2, and their catalytic activity variation according to the size of plasmonic NPs was more sensitive for Ag/TiO2. The observed results seem to be due to the LSPR sensitization effect. It was also found that the M@SiO2 NPs were significantly more effective than the bare M NPs in enhancing the photocatalytic activity of TiO2 and the size-dependent plasmonic effects of the M@SiO2 NPs were quite different from those of the bare M NPs. In regrading to catalytic activity enhancement, the optimum sizes of the Au and Ag NPs for the Au@SiO2 and Ag@SiO2 NPs were determined to be 26 and 25nm, respectively. Moreover, the Ag@SiO2 NPs, which generate stronger LSPR, were more effective than the Au@SiO2 NPs. Consequently, Ag25@SiO2/TiO2 demonstrates the highest activity in decomposing SA and aniline, which is 3.8 and 2.5 times, respectively, that of the bare TiO2.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.025
      Issue No: Vol. 214 (2017)
       
  • Photogeneration of reactive oxygen species from biochar suspension for
           diethyl phthalate degradation
    • Authors: Guodong Fang; Cun Liu; Yujun Wang; Dionysios D. Dionysiou; Dongmei Zhou
      Pages: 34 - 45
      Abstract: Publication date: 5 October 2017
      Source:Applied Catalysis B: Environmental, Volume 214
      Author(s): Guodong Fang, Cun Liu, Yujun Wang, Dionysios D. Dionysiou, Dongmei Zhou
      In this study, the photogeneration of reactive oxygen species (ROS) from biochar suspension was investigated. The characterizations of biochar particles before and after photochemical reactions were analyzed by using FTIR, Raman, XPS and electron paramagnetic resonance (EPR) techniques. It was found that the model pollutant diethyl phthalate (DEP) was efficiently degraded and partially mineralized under UV and simulated solar lights in biochar suspension, with hydroxyl radicals (OH) and singlet oxygen (1O2) as the dominant ROS. EPR coupled with chemical probe methods and free radical quenching studies were used to quantify and elucidate the formation mechanism of OH and 1O2. The results indicated that biochar carbon matrix (BCM) accounted for 63.6%–74.6% of OH and 10%–44.7% of 1O2 formation, while dissolved organic matter (DOM) derived from biochar generated 46.7%–86.3% of 1O2 and 3.7%–12.5% of OH. BCM-bound persistent free radicals (BCM-PFRs) and quinone-like structure of BCM (BCM-Q) were the predominant factors affecting OH and 1O2 formation from BCM under light. Detailed ROS generation pathways are proposed as: (i) DOM from biochar particles contributes to OH and 1O2 formation via light-induced energy and electron transfer processes; (ii) BCM-Q forms excited triplet states (3[BCM-Q]*) under light irradiation and induces the formation 1O2; (iii) UV promotes the formation of BCM-PFRs, which transfer electrons to oxygen to form superoxide anion radical (O2 −), further yielding H2O2; and (iv) H2O2-dependent pathways including BCM-PFRs activation and photo-Fenton reaction are primarily responsible for OH production. Furthermore, BCM exhibits the excellent reusability towards DEP degradation during the three cycles under light.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.036
      Issue No: Vol. 214 (2017)
       
  • Switching of semiconducting behavior from n-type to p-type induced high
           photocatalytic NO removal activity in g-C3N4
    • Authors: Jianmin Luo; Guohui Dong; Yunqing Zhu; Zhong Yang; Chuanyi Wang
      Pages: 46 - 56
      Abstract: Publication date: 5 October 2017
      Source:Applied Catalysis B: Environmental, Volume 214
      Author(s): Jianmin Luo, Guohui Dong, Yunqing Zhu, Zhong Yang, Chuanyi Wang
      The utilization of photocatalytic technology to remove air pollutants has attracted global interest. However, it still suffers from low removal activities under visible light irradiation. In this study, we demonstrated that the switching of the semiconducting behavior from n-type to p-type can efficiently improve the photocatalytic activity of g-C3N4 for nitric oxide (NO) removal about 3.5 times. This is due to that such switching could change the majority of carriers in g-C3N4 from electrons to holes. Interestingly, the photocatalytic removal of NO in both n-type and p-type g-C3N4 is proceeded via hole oxidation. More importantly, p-type g-C3N4 displays strong stability in both photocatalytic performance and crystal structures. This study provides a new strategy to improve the photocatalytic activity of semiconductors for air pollution removal.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.016
      Issue No: Vol. 214 (2017)
       
  • Efficient direct formic acid fuel cell (DFAFC) anode of nano-sized
           palladium complex: High durability and activity origin
    • Authors: Gumaa A. El-Nagar; Kamal M. Dawood; Mohamed S. El-Deab; Bahgat E. Al-Andouli
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Gumaa A. El-Nagar, Kamal M. Dawood, Mohamed S. El-Deab, Bahgat E. Al-Andouli
      The low stability of Pd-based catalysts extremely obstructs their applied application in the direct formic acid fuel cells (DFAFCs). Herein, a novel nano-sized palladium-complex (nano-Pd complex ) with outstanding performance (activity and durability) for DFAFCs anodic reaction (Formic acid oxidation; FAO) compared to the commercial Pd-based catalysts is introduced. Morphologically, nano-sized Pd-complex shows an intersected nano-rod like structure with an average particle size ca. 17nm. Electrochemically, nano-Pd complex modified GC electrode (Nano-Pdcomplex/GC) has 12 times higher electrocatalytic activity, 8.0 times higher electrochemical active surface area, 3.0 times higher catalyst utilization, and ca., 16 times higher stability after 5.0h than that of traditional Pd nanoparticles modified GC electrode (PdNPs/GC) with the same Pd loading. This significant enhancement in both activity and stability is attributed to nano-Pd complex bulky structure hindering the agglomeration of the Pd active sites and inhibiting the adsorption of poisoning CO-like intermediate species. DFT studies shows that nano-Pd complex has two different geometries: (a) cis-structure which has a square planar geometry and it is inactive for FAO, and (b) trans-structure with a tetrahedral geometry and it is highly active for FAO. This study introduces a new promising category of Pd-based catalyst with high activity, catalyst utilization and durability for DFAFCs applications.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.006
      Issue No: Vol. 213 (2017)
       
  • Preparation of g-C3N4 nanorod/InVO4 hollow sphere composite with enhanced
           visible-light photocatalytic activities
    • Authors: Zengyu You; Yuxuan Su; Yang Yu; Hui Wang; Tian Qin; Fang Zhang; Qianhong Shen; Hui Yang
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Zengyu You, Yuxuan Su, Yang Yu, Hui Wang, Tian Qin, Fang Zhang, Qianhong Shen, Hui Yang
      A novel g-C3N4 nanorod/InVO4 hollow sphere composite was fabricated through a facile template-free method. The structure-property relationship was analyzed, and the formation mechanism of such structure and morphology was also proposed based on the observation from time-dependent morphology evolvement. The results show that InVO4 hollow spheres uniformly load on the surface of g-C3N4 nanorod and thus forming the heterojunction with an intimate interface. The bulk g-C3N4 experiences a possible peeling process to form the rod-like structure, during which the mass ratio of InVO4 and ultraphonic process play a key role. Moreover, bubble-template is believed to determine the formation of InVO4 hollow sphere. Owing to this unique structure and morphology, the enhanced visible-light photocatalytic activities are achieved because of the synergistic effect of light harvesting, high transfer efficiency and enhanced separation efficiency of photo-generated carriers. And more importantly, this fabrication method combines heterojunction constructing with morphology controlling of g-C3N4 in one step, and thus may supply a new idea for the preparation of other g-C3N4 based composites.
      Graphical abstract image

      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.015
      Issue No: Vol. 213 (2017)
       
  • Utilization of MoS2 and graphene to enhance the photocatalytic activity of
           Cu2O for oxidative CC bond formation
    • Authors: Zhen Li; Yuxi Pi; Danyun Xu; Yang Li; Wenchao Peng; Guoliang Zhang; Fengbao Zhang; Xiaobin Fan
      Pages: 1 - 8
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Zhen Li, Yuxi Pi, Danyun Xu, Yang Li, Wenchao Peng, Guoliang Zhang, Fengbao Zhang, Xiaobin Fan
      Visible light driven photoredox catalysis has considered as a sustainable and promising strategy for organic synthesis. Here we report a new composite material consisting of cuprous oxide (Cu2O) nanoparticles grown on layered molybdenum disulfide (MoS2) and graphene hybrids as a high-performance photocatalyst for CC bond formation reaction. This composite material shows superior stability and reusability. The enhanced photocatalytic activity of the novel catalyst is attributed to the synergetic effects of MoS2 and graphene as cocatalysts in the composite, in which graphene serves as an excellent electron transporter, and MoS2 nanosheets provide a source of active sites. This work would open a promising way to design and fabricate the efficient composite photocatalysts for organic synthesis.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.010
      Issue No: Vol. 213 (2017)
       
  • A C3N4 surface passivated highly photoactive Au-TiO2 tubular nanostructure
           for the efficient H2 production from water under sunlight irradiation
    • Authors: Rayees Ahmad Rather; Satnam Singh; Bonamali Pal
      Pages: 9 - 17
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Rayees Ahmad Rather, Satnam Singh, Bonamali Pal
      In context to the recent advances in the development of sunlight active nanocomposites for the renewable H2 production from water, a C3N4 passivated Au-TiO2 tubular nanocomposite (CTA) has been prepared by a facile one pot hydrothermal method. Structural and morphological studies revealed the elongated anatase TiO2 nanotubes (200–250nm long, d=12nm) embedded in a thin layer of graphitic C3N4 (1–3nm) and dispersed Au (7–12nm) nanoparticles. The bulk C3N4 turned into monolayer due to the self exfoliation process confirmed by Raman (G band=1545cm−1). The potential voltage (I–V) characteristics revealed the non ohmic properties of the heterojunction with a good current response (1.385×10−4 A). The nanocomposite showed efficient photocatalytic activity with the production of ∼88μmolh−1 (calculated =2933μmolh−1g−1) of H2 gas under direct sunlight irradiation using methanol as hole scavenger. The C3N4 is activated under sunlight and simultaneously sensitized by Au due to its plasmonic effect. The band potential of C3N4 (-1.21eV vs NHE for ECB) is more negative than TiO2 (ECB =−0.29Vs NHE) enabling photo induced electrons to easily pass the interface into the ECB of TiO2 which promotes the charge carrier separation and enhance the photocatalytic activity for H2 production.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.002
      Issue No: Vol. 213 (2017)
       
  • Hydrothermal synthesis of novel heterostructured Fe2O3/Bi2S3 nanorods with
           enhanced photocatalytic activity under visible light
    • Authors: Ahmed Helal; Farid A. Harraz; Adel A. Ismail; Tarek M. Sami; I.A. Ibrahim
      Pages: 18 - 27
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Ahmed Helal, Farid A. Harraz, Adel A. Ismail, Tarek M. Sami, I.A. Ibrahim
      The development of efficient visible-light photocatalyst heterostructures remains a major concern for obtaining desirable material properties and effective carrier transformation. Here, we demonstrate, for the first time, the synthesis of novel heterostructures of Fe2O3/Bi2S3 nanorods via a one-step hydrothermal route and employed effectively as visible-light-driven photocatalysts for the degradation of organic pollutants of methylene blue dye (MB) and phenol. TEM and FE-SEM images displayed that Fe2O3/Bi2S3 heterostructure is nanorods with ∼30–60nm diameter and 0.5–1μm length. The newly prepared Fe2O3/Bi2S3 nanorods exhibit greatly enhanced photocatalytic activity toward both MB and phenol compared to pure Bi2S3 and the heterostructure with low molar ratio of 0.06 Fe2O3/Bi2S3 exhibits the best photocatalytic activity under visible light irradiation. A maximum degradation efficiency of MB and phenol ∼90% and 96% was accomplished using Fe2O3/Bi2S3 nanorods compared to only 60% and 69% using pure Bi2S3, respectively. The photodegradation rates for MB and phenol are promoted respectively as ∼2.6 and 3 times using Fe2O3/Bi2S3 heterostructure higher than pure Bi2S3. Photoluminescence spectra measurement along with the calculation of relative band alignment indicated that Fe2O3/Bi2S3 heterostructure significantly suppress the recombination of photogenerated charge carriers, which is beneficial to improve the photocatalytic activity. The facile synthesis approach, unique photocatalytic activity and excellent reusability of the current Fe2O3 modified Bi2S3 nanostructure make it a promising photocatalyst for the environmental remediation related fields.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.009
      Issue No: Vol. 213 (2017)
       
  • NiMo catalysts supported on Mn-Al2O3 for dibenzothiophene
           hydrodesulfurization application
    • Authors: A. López-Benítez; G. Berhault; A. Guevara-Lara
      Pages: 28 - 41
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): A. López-Benítez, G. Berhault, A. Guevara-Lara
      Modification of the traditional Al2O3 support through addition of manganese to Al2O3 mixed Mn-Al oxides was herein envisaged to obtain highly active NiMo catalysts for hydrodesulfurization application. The effect of adding manganese was determined considering different Mn-Al2O3 supports synthetized using a sol–gel approach. The manganese-containing supports were furthermore impregnated with Ni(NO3)2 +(NH4)6Mo7O24 aqueous solutions at pH=9 and characterized at their oxide state using UV–vis diffuse reflectance and Raman spectroscopies after drying and calcination steps. NiMo/Mn-Al2O3 catalysts were also characterized at the sulfide state mainly by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Finally, the sulfide catalysts were evaluated in the hydrodesulfurization of dibenzothiophene. Results show that the oxidation state of manganese species directly influences the nature of the Mo oxide species and their interaction with the Al2O3 support. At low Mn content (up to 0.5mol% Mn as MnO), Mn2+ species leads to weaker interaction with the support and a higher intrinsic activity of the NiMoS species. However, these promoted sites are also formed in a lower amount than without adding Mn to the support. At too high manganese content (≥2mol% Mn as MnO), Mn3+ species are formed and react with Ni to form a spinel phase decreasing the proportion of promoted phase to be formed after sulfidation. The highest activity is therefore observed at an intermediate Mn content of 1mol% for which a higher intrinsic activity resulting from weaker support interaction and higher sulfidation rate combine together to achieve highly active NiMo HDS catalysts.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.04.058
      Issue No: Vol. 213 (2017)
       
  • Microwave-assisted etherification of glycerol with tert-butyl alcohol over
           amorphous organosilica-aluminum phosphates
    • Authors: R. Estevez; S. Lopez-Pedrajas; D. Luna; F.M. Bautista
      Pages: 42 - 52
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): R. Estevez, S. Lopez-Pedrajas, D. Luna, F.M. Bautista
      The synthesis of organosilica-aluminum phosphates by a simple and cheap sol-gel method was carried out with varying amounts of two different silica precursors, 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane (C) and (3-mercaptopropyl)trimethoxysilane (MPTMS); and several Al/P molar ratios. The solids were calcined in air, at different temperatures. The etherification of glycerol with tert-butyl alcohol was carried out in the liquid-phase under microwave irradiation and also by conventional heating. The incorporation of organosilica in the final solids took place in a 50–60%, as verified by TGA, ICP-MS, XPS and 1H–29Si CP MAS NMR. The highest yield to h-GTBE (21%) was obtained at autogenous pressure, 85°C and 15min of reaction time under microwave, on the solid prepared with 10mmol of C; Al/P=1.5 and calcined at 250°C. This material, with a balanced percentage of mesopores and macropores, also exhibited the highest number of acid sites determined by acid-base titration, as well as by results from TGA and by elemental analysis. The acidity and the hydrophilic character of the solids have been found to be key parameters for the catalytic activity, whereas porosity seems to be advantageous for the reusability of the solids, avoiding deactivation.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.007
      Issue No: Vol. 213 (2017)
       
  • Study of synergetic effect, catalytic poisoning and regeneration using
           dielectric barrier discharge and photocatalysis in a continuous reactor:
           Abatement of pollutants in air mixture system
    • Authors: Wala Abou Saoud; Aymen Amine Assadi; Monia Guiza; Abdelkrim Bouzaza; Wael Aboussaoud; Abdelmottaleb Ouederni; Isabelle Soutrel; Dominique Wolbert; Sami Rtimi
      Pages: 53 - 61
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Wala Abou Saoud, Aymen Amine Assadi, Monia Guiza, Abdelkrim Bouzaza, Wael Aboussaoud, Abdelmottaleb Ouederni, Isabelle Soutrel, Dominique Wolbert, Sami Rtimi
      In the present work the abatement of butyraldehyde (BUTY), dimethyl disulfide (DMDS) and their mixtures in gas phase was studied in continuous reactor at three different configurations: photocatalysis (TiO2 +UV), dielectric barrier discharge (DBD) plasma and their association in the same system (DBD+ TiO2 +UV). The effect of some operating parameters such as inlet concentration of pollutant and flowrate on planar reactor performance in term of (i) BUTY removal (ii) selectivity of CO and CO2, selectivity of byproducts has been also investigated. Moreover, ozone formation has been studied to evaluate the performance of the combined process. A synergetic effect was observed by combining (DBD) plasma and photocatalysis on BUTY removal but has not been present when it was in air mixture with dimethyl disulfide (DMDS) due to the poisoning of the catalyst. Additionally, degradation was observed as a consequence of by-products accumulation on the surface of the catalyst. Moreover, the regeneration/recovery of the initial photocatalytic activity was explored in details. A significant regeneration has been occurred by combining photocatalysis and nonthermal plasma. This trend of nonthermal plasma on catalytic surface can explain the synergetic effect during the pollutant degradation time. Moreover, the catalyst was concomitant with the time required for the hydrophobic to hydrophilic transition on the catalyst surface as followed by contact angle measurement (CA). Redox catalysis was detected by X-ray Photoelectron Spectroscopy (XPS) showing Ti4+/Ti3+ switching during the degradation, poisoning and regeneration times.
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      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.012
      Issue No: Vol. 213 (2017)
       
  • Bactericide effects of transparent polyethylene photocatalytic films
           coated by oxides under visible light
    • Authors: Sami Rtimi; John Kiwi
      Pages: 62 - 73
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Sami Rtimi, John Kiwi
      This review addresses catalytic/photocatalytic films under visible light inducing fast bacterial inactivation. These films present uniform, stable and adhesive surfaces able to inactivate bacteria within minutes. Uniform sputtered polyethylene-TiO2 (PE-TiO2) films absorbing mainly in the UV-region were later followed by studies on PE-FeOx and PE-FeOx-TiO2 absorbing light in the visible region. The amount of TiO2 sputtered on PE was significantly increased by RF-plasma pre-treatment due to the additional polar binding sites introduced on the PE-film. The hydrophobic to hydrophilic conversion of the PE-TiO2 films under light irradiation was observed to be concomitant with the bacterial inactivation time. The TiO2 diffuse reflectance spectra (DRS) of TiO2-PE-films were extensively modified by the sputtering of FeOx. The structure of the sputtered layers revealed a random deposition of FeOx-TiO2 on PE. The oxidative radical species generated on semiconductor surfaces were identified by appropriate scavenging experiments. By photoelectron spectroscopy (XPS), the redox processes occurring on the photocatalysts were evaluated. Repetitive bactericide cycling was possible for the three films discussed in this review. Bacterial inactivation mechanisms were suggested for the different films presented in this review.
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      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.05.004
      Issue No: Vol. 213 (2017)
       
  • Aligned α-FeOOH nanorods anchored on a graphene oxide-carbon nanotubes
           aerogel can serve as an effective Fenton-like oxidation catalyst
    • Authors: Yuyang Liu; Xuemin Liu; Yaping Zhao; Dionysios D. Dionysiou
      Pages: 74 - 86
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Yuyang Liu, Xuemin Liu, Yaping Zhao, Dionysios D. Dionysiou
      The self-assembled synthesis of a hierarchical graphene oxide (GO)-carbon nanotubes (CNTs)-α-FeOOH decorated composite aerogel (α-FeOOH@GCA) through a facile in-situ hydrolysis route is reported for the first time and the materials was tested for its performance as Fenton-like catalyst. The introduction of GO-CNTs clearly mediated the morphology to aligned α-FeOOH nanorods (ca. 100nm) within aerogel matrix comparing with pristine urchin-like α-FeOOH three-dimensional microstructures (ca. 1μm). This three dimensional porous aerogel network provided efficient charge/mass-transfer leading to great enhancement of the catalytic activity of α-FeOOH. The outstanding catalytic performance of this composite in degradation of organics with different charge and structure, i.e. Orange II (OII), rhodamine B (RhB), methylene blue (MB), phenol and endocrine disruptor bisphenol A (BPA) was demonstrated. For example, the discoloration of OII with pseudo first-order rate constant of 0.10min−1 significantly exceeded that of pristine α-FeOOH. At relatively low concentration of α-FeOOH@GCA catalyst (125mgL−1) and H2O2 (0.55mM) showed excellent catalytic activity for efficient (∼99%) discoloration of OII (40mgL−1) under a 60min UV365 irradiation in the pH range 3–10. The different charge of five target contaminats greatly determined the surface-catalyzed degradation kinetics at natural solution pH in the order of cationic>neutral>anionic organics due to the negatively charged carbon-based aerogel matrix. The new identified desulfonation intermediates elucidated through UPLC–MS analysis indicated two reaction pathways: 1) hydroxylation and 2) desulfonation by-products followed by cleavage of the azo bond as the predominant degradation pathway of OII. The elimination of the acute toxicity of the parent contaminant to luminescent bacterium Q67 was consistent with the formation of less toxic degradation by-products identified. Free radical quenching studies accessed the role of hydroxyl radical (OH), superoxide anion radical (O2 −) and singlet oxygen (1O2) as the dominating reactive oxygen species (ROS). The quantitative studies to measure radical concentrations using relative molecular probes showed the effective activation of H2O2 led to high rate production of ROS accounted for OII degradation. The greatly enhanced photocatalytic property of this hybrid was correlated with the efficient conversion between Fe2+/Fe3+ and synergistic coupling between α-FeOOH and carbon-based aerogel matrix evidenced through the formation of FeOC chemical bonds was verified by X-ray photoelectron (XPS) analysis. Based on its simple and scalable preparation route as well as its excellent UV365 or visible light-responsive catalytic performance, this hybrid exhibits a high potential to be used as an efficient and environmental-friendly catalyst for water remediation.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.019
      Issue No: Vol. 213 (2017)
       
  • Enhanced photocatalytic mechanism of the Nd-Er co-doped tetragonal BiVO4
           photocatalysts
    • Authors: Ting Liu; Guoqiang Tan; Chengcheng Zhao; Chi Xu; Yuning Su; Ying Wang; Huijun Ren; Ao Xia; Dan Shao; Shemin Yan
      Pages: 87 - 96
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Ting Liu, Guoqiang Tan, Chengcheng Zhao, Chi Xu, Yuning Su, Ying Wang, Huijun Ren, Ao Xia, Dan Shao, Shemin Yan
      The Nd/Er co-doped tetragonal BiVO4 photocatalysts are synthesized by a microwave hydrothermal method, and the crystal structures, morphologies and optical properties are characterized. The substitution of Nd3+ and Er3+ for Bi3+ sites leads to distortion of the [VO4] tetrahedron chains and induces the monoclinic structure transforming into the tetragonal structure, with the morphology evolving from nano particle agglomerations to disorganized regular rods agglomerations. The impurity energy levels induced by Nd3+ and Er3+ in the energy band of BiVO4 act as electron traps and have further energy transfer in the up-conversion processes to facilitate the photocarriers’ separation. The more positive VB positions in the co-doped BiVO4 band structures can also effectively enhance oxidation capacity. Based on the above synergetic effect, the degradation rate the degradation rate of co-doped tetragonal BiVO4 photocatalyst can reach the highest 96% within 150min under simulated sunlight and 20min under the NIR irradiation.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.018
      Issue No: Vol. 213 (2017)
       
  • Enhanced performance for plasma-catalytic oxidation of ethyl acetate over
           La1-xCexCoO3+δ catalysts
    • Authors: Xinbo Zhu; Shuo Zhang; Yang Yang; Chenghang Zheng; Jinsong Zhou; Xiang Gao; Xin Tu
      Pages: 97 - 105
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Xinbo Zhu, Shuo Zhang, Yang Yang, Chenghang Zheng, Jinsong Zhou, Xiang Gao, Xin Tu
      In this work, plasma-catalytic oxidation of low concentration ethyl acetate (100ppm) over La1-xCexCoO3+δ (x=0, 0.05, 0.1, 0.3 and 0.5) perovskite catalysts was carried out in a coaxial dielectric barrier discharge (DBD) reactor. The effects of Ce-doping on the removal of ethyl acetate and COx (x=1 and 2) selectivity in the plasma-catalytic oxidation process were investigated as a function of specific energy density (SED). Compared to the plasma reaction without a catalyst, the presence of the LaCoO3 catalyst in the plasma enhanced the removal of ethyl acetate and COx selectivity. The use of the Ce-doped catalysts further enhanced the performance of the plasma-catalytic oxidation process. The highest removal efficiency of ethyl acetate (100%) and COx selectivity (91.8%) were achieved in the plasma-catalytic oxidation of ethyl acetate over the La0.9Ce0.1CoO3+δ catalyst at a SED of 558JL−1. The interactions between Ce and LaCoO3 resulted in an increased specific surface area (by 17.1%–68.6%) and a reduced crystallite size (by 13.5%–68.2%) of the Ce-doped LaCoO3 catalysts compared to pure LaCoO3, which favours the oxidation of ethyl acetate in the plasma process. Compared to the LaCoO3 catalyst, the Ce-doped perovskite catalysts showed higher content (maximum 54.9%) of surface adsorbed oxygen (Oads) and better reducibility, both of which significantly contributed to the enhanced oxidation of ethyl acetate and intermediates in the plasma-assisted surface reactions. The coupling of plasma with the Ce-doped catalysts also reduced the formation of by-products including NO2 and N2O. The possible reaction pathways involved in the plasma oxidation process have been discussed.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.04.066
      Issue No: Vol. 213 (2017)
       
  • Upgrading HDS activity of MoS2 catalysts by chelating thioglycolic acid to
           MoOx supported on alumina
    • Authors: José A. Toledo-Antonio; M.A. Cortes-Jacome; J. Escobar-Aguilar; C. Angeles-Chavez; J. Navarrete-Bolaños; E. López-Salinas
      Pages: 106 - 117
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): José A. Toledo-Antonio, M.A. Cortes-Jacome, J. Escobar-Aguilar, C. Angeles-Chavez, J. Navarrete-Bolaños, E. López-Salinas
      Alumina-supported Mo-based hydrodesulfurization catalysts (14wt% nominal Mo loading) were modified by thioglycolic acid (TGA, TGA/Mo=1mol ratio), as a chelating agent containing a thiol group. To that end, two series of catalyst were prepared: the first one by using ammonium heptamolybdate as a precursor and, in the second one, in situ obtained phosphomolybdates from MoO3 digestion in diluted H3PO4. Oxidic phases were characterized by N2 physisorption, Raman and UV–vis spectroscopies, electron microscopy and XPS. As well, the corresponding sulfided phases were studied by XPS, HR-TEM-STEM techniques, and chemical composition was determined by STEM-EDX. Formation of ligand-to-metal charge transfer (LMCT) complexes between the S-bearing TGA and Mo atoms, resulted in reduced Mo5+ species, as indicated by XPS, and was correlated to electronic transitions bands in the UV–visible spectra. On the other hand, the catalysts prepared from phosphomolybdates impregnation and TGA addition resulted in two-fold amount of Mo4+ sulfided species, as indicated by XPS. TGA impregnation redissolve and disperse the MoO3 resulting in materials particles in materials with increased stacking of MoS2 slabs on which slabs length remained essentially unaltered. Highly active (as tested in liquid-phase dibenzothiophene hydrodesulfurization) Type II sites were favored mainly in sulfided TGA-modified formulations.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.011
      Issue No: Vol. 213 (2017)
       
  • Fabrication of hollow mesoporous SiO2-BiOCl@PANI@Pd photocatalysts to
           improve the photocatalytic performance under visible light
    • Authors: Yi Tian; Wei Li; Chenhui Zhao; Yufei Wang; Baoliang Zhang; Qiuyu Zhang
      Pages: 136 - 146
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Yi Tian, Wei Li, Chenhui Zhao, Yufei Wang, Baoliang Zhang, Qiuyu Zhang
      A facile method was developed to synthesize a series of hollow mesoporous SiO2-BiOCl@PANI@Pd (HBPP) photocatalysts with super adsorption performance, plasmonic effect and fast interfacial charge migration. The samples were characterized by XRD, FETEM, FT-IR, XPS, DRS, etc. Photocatalytic degradation of methyl orange (MO) by HBPP composites was investigated. Results showed that the photocatalytic property of HBPP composite was superior to that of hollow mesoporous SiO2-BiOCl@PANI (HBP) composite under visible light irradiation, and the HBPP5wt% photocatalyst synthesized under 140°C exhibits the highest photocatalytic activity. In this photocatalysis system, the orderly mesoporous opening structure of the hollow mesoporous SiO2 sphere could effectively facilitate the transfer of reactant molecules, and the existence of the internal cavities would effectively prolong the action time of the irradiated light for the multiple reflections. Moreover, the formation of interacted interfaces between the semiconductor BiOCl and conducting polymer (polyaniline) could effectively improve the separation of the photogenerated electron-hole pairs, and the palladium nanoparticles (Pd NPs) with strong localized surface plasmon resonance (LSPR) absorption band in the near-UV region could effectively induce the generation of the photoexcited electron-hole pairs in BiOCl, thus the as-obtained photocatalyst exhibits superior photocatalytic activity under visible light irradiation. The work may set foundation for application of the new photocatalyst of HBPP-based LSPR and make an important step forward remedying environmental pollution.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.026
      Issue No: Vol. 213 (2017)
       
  • Metal oxide semiconductor nanomaterial for reductive debromination:
           Visible light degradation of polybrominated diphenyl ethers by Cu2O@Pd
           nanostructures
    • Authors: Edward B. Miller; Elsayed M. Zahran; Marc R. Knecht; Leonidas G. Bachas
      Pages: 147 - 154
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Edward B. Miller, Elsayed M. Zahran, Marc R. Knecht, Leonidas G. Bachas
      Polybrominated diphenyl ethers (PBDEs), which have found extensive use as flame-retarding additives to many polymer materials, are now environmentally ubiquitous and persistent pollutants that present potential health risks to humans and wildlife. Herein, we report for the first time the use of metal oxide semiconductor nanostructures for photocatalytic reductive debromination of PBDEs using visible light. Well-defined cubic Cu2O crystals, surface-decorated with Pd nanoparticles, were prepared via a hydrothermal approach. The Cu2O@Pd demonstrated light-activated tandem photocatalysis, in which Cu2O produces H2 from H2O under visible light irradiation; the evolved H2 is subsequently activated by Pd to achieve the reductive hydrodehalogenation of the PBDE. Cu2O@Pd demonstrated effective debromination of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47), one of the PBDEs of greatest environmental concern, with initial pseudo-first-order rate constant of 0.21 h−1. It is shown that the reaction proceeds via a reductive mechanism with preferential debromination at the para positions. Reaction rates for various monobromo- and dibromo-congeners were evaluated, confirming that the debromination order of preference is para>meta>> ortho, which is opposite to the order reported for direct photolysis. We conclude that Cu2O@Pd is a promising photocatalyst for reductive dehalogenation of halogenated organic compounds.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.020
      Issue No: Vol. 213 (2017)
       
  • Superior photocatalytic properties of carbonized PANI/TiO2 nanocomposites
    • Authors: Marija Radoičić; Gordana Ćirić-Marjanović; Vuk Spasojević; Phil Ahrenkiel; Miodrag Mitrić; Tatjana Novaković; Zoran Šaponjić
      Pages: 155 - 166
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Marija Radoičić, Gordana Ćirić-Marjanović, Vuk Spasojević, Phil Ahrenkiel, Miodrag Mitrić, Tatjana Novaković, Zoran Šaponjić
      A simple bottom–up method for the preparation of novel and very efficient photocatalytic nanocomposite system based on carbonized form of polyaniline (PANI) and colloidal TiO2 nanocrystals has been developed. The carbonized PANI/TiO2 nanocomposites were synthesized in a two-step procedure. Firstly, non-carbonized PANI/TiO2 nanocomposites were synthesized by the chemical oxidative polymerization of aniline (ANI) with ammonium peroxydisulfate, in the presence of colloidal TiO2 nanoparticles (TiO2 NPs) (d∼4.5nm). Initial [TiO2]/[ANI] mole ratios were 20, 50, and 80. In the second step, following the polymerization process, the carbonization of PANI/TiO2 nanocomposites was performed by thermal treatment in an inert atmosphere at 650°C. The morphological and structural properties of the carbonized nanocomposites were studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and Raman spectroscopy. The accomplishment of complete carbonization of PANI in PANI/TiO2 nanocomposites was confirmed by Raman spectroscopy. The appearance of anatase and rutile crystal forms in TiO2 NPs upon carbonization, with mass ratio depending on the initial molar ratio of ANI and TiO2 NPs was revealed by XRD measurements, TEM, SEM and Raman spectroscopy. The photocatalytic activities of carbonized PANI/TiO2 nanocomposites were evaluated following the photocatalytic degradation processes of Rhodamine B and Methylene blue. Carbonized PANI/TiO2 nanocomposites showed higher photocatalytic efficacy compared to bare TiO2 NPs and non-carbonized PANI/TiO2 nanocomposites. The porosity and surface structure of carbonized PANI/TiO2 nanocomposites, as well as crystalline structure of TiO2, affect photocatalytic activity of nanocomposites.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.023
      Issue No: Vol. 213 (2017)
       
  • Support effects of NiW catalysts for highly selective sulfur removal from
           light hydrocarbons
    • Authors: J.N. Díaz de León; L.A. Zavala-Sánchez; V.A. Suárez-Toriello; G. Alonso-Núñez; T.A. Zepeda; R.I. Yocupicio; J.A. de los Reyes; S. Fuentes
      Pages: 167 - 176
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): J.N. Díaz de León, L.A. Zavala-Sánchez, V.A. Suárez-Toriello, G. Alonso-Núñez, T.A. Zepeda, R.I. Yocupicio, J.A. de los Reyes, S. Fuentes
      The intrinsic support effect was explored in the preparation of NiW hydrodesulfurization catalysts through building correlations of catalytic performance to extensive surface characterization results. We found that the catalytic activity on the hydrodesulfurization of 3,methyl-thiophene correlates well with the normalized intensities data of NO adsorbed on Ni active sites. Also, a correlation between the catalytic activity and the number of tungsten edge atoms in the WS2 slabs was observed. The characterization of the NiW catalysts revealed that is possible to modulate the metal-support interaction by substituting the carrier. This specific interaction with each support derived into particular morphological parameters for the sulfide active phase. Optimal values for the slab length and the stacking of the WS2 slabs were proposed.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.014
      Issue No: Vol. 213 (2017)
       
  • In-operando elucidation of bimetallic CoNi nanoparticles during
           high-temperature CH4/CO2 reaction
    • Authors: Bedour AlSabban; Laura Falivene; Sergey M. Kozlov; Antonio Aguilar-Tapia; Samy Ould-Chikh; Jean-Louis Hazemann; Luigi Cavallo; Jean-Marie Basset; Kazuhiro Takanabe
      Pages: 177 - 189
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Bedour AlSabban, Laura Falivene, Sergey M. Kozlov, Antonio Aguilar-Tapia, Samy Ould-Chikh, Jean-Louis Hazemann, Luigi Cavallo, Jean-Marie Basset, Kazuhiro Takanabe
      Dry reforming of methane (DRM) proceeds via CH4 decomposition to leave surface carbon species, followed by their removal with CO2-derived species. Reactivity tuning for stoichiometric CH4/CO2 reactants was attempted by alloying the non-noble metals Co and Ni, which have high affinity with CO2 and high activity for CH4 decomposition, respectively. This study was focused on providing evidence of the capturing surface coverage of the reactive intermediates and the associated structural changes of the metals during DRM at high temperature using in-operando X-ray absorption spectroscopy (XAS). On the Co catalysts, the first-order effects with respect to CH4 pressure and negative-order effects with respect to CO2 pressure on the DRM rate are consistent with the competitive adsorption of the surface oxygen species on the same sites as the CH4 decomposition reaction. The Ni surface provides comparatively higher rates of CH4 decomposition and the resultant DRM than the Co catalyst but leaves some deposited carbon on the catalyst surface. In contrast, the bimetallic CoNi catalyst exhibits reactivity towards the DRM but with kinetic orders resembling Co catalyst, producing negligible carbon deposition by balancing CH4 and CO2 activation. The in-operando X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements confirmed that the Co catalyst was progressively oxidized from the surface to the bulk with reaction time, whereas CoNi and Ni remained relatively reduced during DRM. Density functional theory (DFT) calculation considering the high reaction temperature for DRM confirmed the unselective site arrangement between Co and Ni atoms in both the surface and bulk of the alloy nanoparticle (NP). The calculated heat of oxygen chemisorption became more exothermic in the order of Ni, CoNi, Co, consistent with the catalytic behavior. The comprehensive experimental and theoretical evidence provided herein clearly suggests improvement to the catalyst design protocol by selecting the appropriate composition of Co-Ni alloy.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.04.076
      Issue No: Vol. 213 (2017)
       
  • Removal of pendimethalin from soil washing effluents using electrolytic
           and electro-irradiated technologies based on diamond anodes
    • Authors: Perla T. Almazán-Sánchez; Salvador Cotillas; Cristina Sáez; Marcos J. Solache-Ríos; Verónica Martínez-Miranda; Pablo Cañizares; Ivonne Linares-Hernández; Manuel A. Rodrigo
      Pages: 190 - 197
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Perla T. Almazán-Sánchez, Salvador Cotillas, Cristina Sáez, Marcos J. Solache-Ríos, Verónica Martínez-Miranda, Pablo Cañizares, Ivonne Linares-Hernández, Manuel A. Rodrigo
      This work describes the treatment of soil polluted with the herbicide pendimethalin by the combination of surfactant-aided soil-washing (SASW) and electrochemical advanced oxidation processes. Results show that it is possible to completely extract the herbicide from soil using SDS (sodium dodecyl sulfate) solutions as soil washing fluid (SWF) and ratios SWF/soil higher than 10dm3 kg−1. Soil washing effluents obtained after the application of the SASW consisted of a mixture of surfactant (high concentration) and pesticide (low concentration) and their degradation by electrolysis, photo-assisted electrolysis (photoelectrolysis) and sonoelectrolysis with diamond anodes has been compared with that obtained by the application of single photolysis and sonolysis. Opposite to photolysis and sonolysis, the different electrolytic techniques allow decreasing the concentration of herbicide and surfactant in the effluents. Competition between the surfactant and the herbicide oxidation is important and irradiation of high-frequency ultrasound or UV light do not seem to outperform very importantly the results obtained by single electrolysis in the effluents of the SASW obtained with low SDS/soil ratios. Opposite, photoelectrolysis becomes the most efficient technology for the treatment of SWF obtained at high SDS/soil ratios (those required for an efficient SASW). Catalytic effect of the sulfate released during the degradation of SDS (in particular the formation of sulfate radicals) can help to explain the differences observed. The removal efficiency is higher during sonoelectrolysis, reaching a final removal of the pesticide after 8h of treatment of 86.22%. Photoelectrolysis (57.59%) shows higher efficiencies for the removal of SDS followed by sonoelectrolysis (52.64%) and, finally, electrolysis (48.29%), after 8h of treatment.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.05.008
      Issue No: Vol. 213 (2017)
       
  • Key factors in Sr-doped LaBO3 (B=Co or Mn) perovskites for NO oxidation in
           efficient diesel exhaust purification
    • Authors: Jon A. Onrubia; B. Pereda-Ayo; U. De-La-Torre; Juan R. González-Velasco
      Pages: 198 - 210
      Abstract: Publication date: 15 September 2017
      Source:Applied Catalysis B: Environmental, Volume 213
      Author(s): Jon A. Onrubia, B. Pereda-Ayo, U. De-La-Torre, Juan R. González-Velasco
      Perovskites have attracted attention in recent years as an economic alternative to noble metals in oxidation processes. Synthesis conditions of LaCoO3 and LaMnO3 perovskites have been studied varying citrate to nitrate molar ratio in the starting solution, pH and calcination protocol, with the aim of obtaining high purity perovskites, absence of impurities, and with enhanced textural properties. Once synthesis conditions were established, strontium was incorporated in the perovskite lattice as a textural and structural promoter, by substituting lanthanum with different doping levels, i.e. La0.9Sr0.1BO3, La0.8Sr0.2BO3, La0.7Sr0.3BO3, La0.6Sr0.4BO3 and La0.5Sr0.5BO3 with B=Co or Mn. The prepared solids were characterized in terms of crystalline phase identification (XRD), specific surface area (N2 adsorption–desorption at −196°C), reducibility and oxidation state of transition metal ions (H2-TPR), quantification of adsorbed oxygen species (O2-TPD) and surface elemental composition (XPS). Charge imbalance associated to strontium (Sr2+) incorporation in the perovskite lattice in substitution of lanthanum (La3+) was preferentially balanced by Mn4+ promotion in La1−x Sr x MnO3 perovskites, whereas formation of oxygen vacancies seems to be the mechanism for charge compensation in La1−x Sr x CoO3 perovskites, where Co ions remained as Co3+ ions. Strontium doped perovskites further improved NO conversion compared to the non-substituted formulations. The best NO oxidation performance was obtained with La0.7Sr0.3CoO3 and La0.9Sr0.1MnO3 samples, achieving maximum NO conversion of 83 and 65% at 300 and 325°C, respectively. Higher oxidation capacity of La0.7Sr0.3CoO3 sample was associated to the higher oxygen mobility and exchange capacity between oxygen in the lattice and gas phase oxygen. It is worth noting that prepared perovskites presented far higher NO oxidation capacity than platinum-based NSR model catalysts, confirming perovskites as an economic alternative to catalyze NO oxidation reactions in automotive catalysis.
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      PubDate: 2017-05-18T02:08:24Z
      DOI: 10.1016/j.apcatb.2017.04.068
      Issue No: Vol. 213 (2017)
       
  • Inhibition of photocorrosion of CdS via assembling with thin film TiO2 and
           removing formed oxygen by artificial gill for visible light overall water
           splitting
    • Authors: Xiaofeng Ning; Jian Li; Baojun Yang; Wenlong Zhen; Zhen Li; Bin Tian; Gongxuan Lu
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Xiaofeng Ning, Jian Li, Baojun Yang, Wenlong Zhen, Zhen Li, Bin Tian, Gongxuan Lu
      CdS is a well-known and important visible-light responsive photocatalyst for overall water splitting. However, the serious photocorrosion property limits its application in photocatalysis. Through modification TiO2 thin film over CdS surface, TiO2/CdS photocatalyst exhibited an obviously enhanced photocatalytic stability. The H2 evolution rate (3.074μmolh−1 g−1) of modified Pt-TiO2/CdS under visible light toward overall water splitting was almost 6 times higher than that of CdS sample (0.534μmolh−1 g−1). The application of artificial gill in photocatalytic overall water splitting system removed the newly formed oxygen from catalyst surface mainly inhibiting the hydrogen and oxygen back recombination to water and preventing the oxygen led oxidation or photocorrosion. By these two strategies, we fulfilled visible light induced overall water splitting in CdS dispersion and achieved satisfied stability during reaction.
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      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.074
      Issue No: Vol. 212 (2017)
       
  • Mesoporous TiO2 films coated on carbon foam based on waste polyurethane
           for enhanced photocatalytic oxidation of VOCs
    • Authors: Xufang Qian; Meng Ren; Dongting Yue; Yao Zhu; Yu Han; Zhenfeng Bian; Yixin Zhao
      Pages: 1 - 6
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Xufang Qian, Meng Ren, Dongting Yue, Yao Zhu, Yu Han, Zhenfeng Bian, Yixin Zhao
      Carbon foams (CFs) were prepared by using waste polyurethane foams (PUFs) as hard templates and phenolic resin as a carbon source. The obtained CFs were treated to be hydrophilic with plenty of carboxyle group by a wet oxidization method. Mesoporous TiO2 films were then facilely deposited on hydrophilic carbon foams (hydro-CFs) because the hydrophilic carbon surface facilitates the formation of uniform coating layer. The macroporous hydro-CFs act as not only the supports of TiO2 films but also the adsorbent for enriching the VOCs at the interface of hydro-CF and mesoTiO2 films. The UV–vis and visible light irradiation photocatalytic oxidation of acetone and toluene was evaluated on mesoTiO2/hydro-CF, which is higher than that of pure mesoTiO2 and mesoTiO2/CF. The mesoTiO2/hydro-CF even showed visible light activity for acetone degradation due to the plausible carbon doping due to the strong interaction between the TiO2 precursor and the hydro-CFs.
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.059
      Issue No: Vol. 212 (2017)
       
  • Ultrathin MoS2 layers anchored exfoliated reduced graphene oxide nanosheet
           hybrid as a highly efficient cocatalyst for CdS nanorods towards enhanced
           photocatalytic hydrogen production
    • Authors: D. Praveen Kumar; Sangyeob Hong; D. Amaranatha Reddy; Tae Kyu Kim
      Pages: 7 - 14
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): D. Praveen Kumar, Sangyeob Hong, D. Amaranatha Reddy, Tae Kyu Kim
      The development of novel highly efficient noble metal-free co-catalysts for enhanced photocatalytic hydrogen production is of great importance. Herein, we report the synthesis of novel and highly efficient noble metal-free ultra-thin MoS2 (UM) layers on exfoliated reduced graphene oxide (ERGO) nanosheets as a cocatalyst for CdS nanorods (ERGO/UM/CdS). A simple method different from the usual preparation techniques is used to convert MoS2 to UM layers, graphene oxide (GO) to ERGO nanosheets, based on ultrasonication in the absence of any external reducing agents. The structure, optical properties, chemical states, and dispersion of MoS2 and CdS on ERGO are determined using diverse analytical techniques. The photocatalytic activity of as-synthesized ERGO/UM/CdS composites is assessed by the splitting of water to generate H2 under simulated solar light irradiation in the presence of lactic acid as a hole (h +) scavenger. The observed extraordinary hydrogen production rate of ∼234mmolh−1 g−1 is due to the synergetic effect of the ultrathin MoS2 layers and ERGO, which leads to the effective separation of photogenerated charge carriers and improves the surface shuttling properties for efficient H2 production. Furthermore, the observed H2 evolution rate is much higher than that for individual noble metal (Pt), ERGO and MoS2-assisted CdS photocatalysts. Moreover, to the best of our knowledge, this is the highest H2 production rate achieved by a RGO and MoS2 based CdS photocatalyst for water splitting under solar light irradiation. Considering its low cost and high efficiency, this system has great potential for the development of highly efficient photocatalysts used in various fields
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.065
      Issue No: Vol. 212 (2017)
       
  • The role of water on the selective decarbonylation of
           5-hydroxymethylfurfural over Pd/Al2O3 catalyst: Experimental and DFT
           studies
    • Authors: Qingwei Meng; Dongbo Cao; Guoyan Zhao; Chengwu Qiu; Xingchen Liu; Xiaodong Wen; Yulei Zhu; Yongwang Li
      Pages: 15 - 22
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Qingwei Meng, Dongbo Cao, Guoyan Zhao, Chengwu Qiu, Xingchen Liu, Xiaodong Wen, Yulei Zhu, Yongwang Li
      Highly selective decarbonylation of 5-hydroxymethylfurfural (HMF) to furfuryl alcohol (FOL) was originally realized by adding water to organic solvent. Side reactions such as hydrogenolysis, dehydrogenation and etherification could be effectively suppressed by introducing appropriate amount of water in pure organic solvent. Based on DFT calculations, hydrogen bonds between hydroxymethyl groups and water hinder the dehydrogenation of FOL to furfural (FAL) and furan. On the other hand, in situ water-pyridine-FTIR measurements revealed that the hydrogen bonding interaction between water and the hydroxyl groups on γ-Al2O3 surface decrease the acidity of Pd/Al2O3 and suppresses side reactions such as hydrogenolysis and etherification. Therefore, adding water to organic solvent could be a strategy for the protection of hydroxyl groups.
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.069
      Issue No: Vol. 212 (2017)
       
  • A two-pronged strategy to enhance visible-light-driven overall water
           splitting via visible-to-ultraviolet upconversion coupling with
           hydrogen-oxygen recombination inhibition
    • Authors: Wei Gao; Wenyan Zhang; Gongxuan Lu
      Pages: 23 - 31
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Wei Gao, Wenyan Zhang, Gongxuan Lu
      Visible-light-driven overall splitting water is a potential and sustainable approach for hydrogen generation. Although many photocatalysts have been reported to be active for this reaction, the efficiency of overall splitting water is still quite low. In this work, a two-pronged strategy is adopted to overcome two key restrictions on visible-light-driven photocatalytic overall water splitting by taking advantages of visible-to-ultraviolet upconversion (UC) effect as well as inhibiting hydrogen-oxygen recombination reaction over the photocatalyst. In order to realize that purpose, a composite photocatalyst with high stability was designed by assembling three components consisting of visible-to-ultraviolet UC Pr3+-Y2SiO5, UV-responsive semiconductor photocatalyst CaTiO3 and perfluorodecalin as an oxygen transfer regent. By the first strategy, the visible-to-ultraviolet UC unit is capable of converting visible irradiation to UV light emission, which effectively excites UV-responsive photocatalyst CaTiO3. The photocatalytic activity has been raised up to 200% by regulating the amount of visible-to-ultraviolet UC Pr3+-Y2SiO5 in the designed composite photocatalyst Pr3+-Y2SiO5/CaTiO3. The photocatalyst exhibited high photochemical stability and catalytic stability in four recycle reactions. By the second strategy, hydrogen and oxygen recombination on photocatalyst surface has been effectively inhibited by an oxygen transfer reagent FDC to capture and take away newly generated oxygen from catalyst surface. This two-pronged strategy is not only convenient and efficient, but exhibits potential versatility for the most stable UV-responsive semiconductor photocatalysts to realize overall split water by visible light irradiation.
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.063
      Issue No: Vol. 212 (2017)
       
  • Oxidative desulfurization of dibenzothiophene over monoclinic VO2
           phase-transition catalysts
    • Authors: Kun Chen; Ni Liu; Minghui Zhang; Danhong Wang
      Pages: 32 - 40
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Kun Chen, Ni Liu, Minghui Zhang, Danhong Wang
      Phase-pure monoclinic VO2 (M) was successfully synthesized by hydrothermal reduction method using oxalic acid as a reductant and solvent-thermal reduction method using methanol as a reductant. Oxidative desulfurization (ODS) activities were investigated and the results revealed that intrinsic ODS activity increased with increasing cell volume for different synthesized VO2 (M) catalysts. DSC measurement gives the evidence that phase transition temperature of monoclinic VO2 (M) to rutile VO2 (R) decreased with increasing cell volume for different VO2 (M) catalysts. Variable-temperature in-situ Raman spectrum also confirmed that phase transition from VO2 (M) to VO2 (R) occurred. Mechanism of ODS reaction on VO2 (M) catalyst was investigated precisely involving temperatures which phase transition occurred. Below the phase-transition temperature VO2 (M) showed higher ODS reaction activation energy, while above the phase-transition temperature VO2 (R) exhibited lower ODS activation energy. This result may be explained by the fact that VO bond length for VO2 (R) (1.93Å) fits more for the five-member ring formed with the oxidant tert-butyl hydroperoxide (TBHP) during ODS reaction compared with V-O bond length for VO2 (M) (about 2.03 or 1.86Å).
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.046
      Issue No: Vol. 212 (2017)
       
  • Removal of bisphenol A over a separation free 3D Ag3PO4-graphene hydrogel
           via an adsorption-photocatalysis synergy
    • Authors: Chenfan Mu; Yu Zhang; Wenquan Cui; Yinghua Liang; Yongfa Zhu
      Pages: 41 - 49
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Chenfan Mu, Yu Zhang, Wenquan Cui, Yinghua Liang, Yongfa Zhu
      Here we reported a silver phosphate/graphene hydrogel (Ag3PO4/rGH) with efficient degradation of bisphenol A (BPA) with the synergy of adsorption and photocatalysis. The Ag3PO4/rGH 3D structure exhibits enriched adsorption-photocatalytic degradation ability for the removal of BPA under visible-light irradiation, and its three-dimensional structure facilitates the rapid recycle and reuse ability of the photocatalyst. The maximum adsorption capacity was 15mg/g which is 2.1 times and 2.4 times than that of Ag3PO4/AC, Ag3PO4/Al2O3. The BPA could be even 100% removed in 12min by the synergy of adsorption and photocatalysis under visible light irradiation. The removal ability was more than 90% after recycling 5 time indicating superiority of separation freely without complicated filter system for 3D structured hydrogel. The Ag3PO4/rGH 3D structure also showed high removal activity and stability in the continuous flow reaction system, and the 100% removal of BPA have been maintained more than 60h. In all, Ag3PO4/rGH 3D structure possesses superiority of separation freely without complicated filter system.
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.018
      Issue No: Vol. 212 (2017)
       
  • Mechanisms for the enhanced photo-Fenton activity of ferrihydrite modified
           with BiVO4 at neutral pH
    • Authors: Tianyuan Xu; Runliang Zhu; Gangqiang Zhu; Jianxi Zhu; Xiaoliang Liang; Yanping Zhu; Hongping He
      Pages: 50 - 58
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Tianyuan Xu, Runliang Zhu, Gangqiang Zhu, Jianxi Zhu, Xiaoliang Liang, Yanping Zhu, Hongping He
      Heterogeneous photo-Fenton catalysts generally show very weak photo-Fenton activity at near-neutral pH because of the relatively low rate of Fe2+ regeneration. The aim of this work is to develop novel heterogeneous photo-Fenton catalysts, which can accelerate the regeneration of Fe2+ and thus have superior photo-Fenton activity at near-neutral pH. In this study, ferrihydrite (Fh) was modified with BiVO4 to synthesize BiVO4/Fh composites, and we expected that the photogenerated electrons from BiVO4 would accelerate the regeneration of Fe2+ on Fh. Mechanistic investigation of H2O2 consumption showed that the introduction of BiVO4 promoted the decomposition of H2O2 into reactive oxygen species (ROS). In addition, the presence of BiVO4 deterred O2 − production and accelerated the formation of OH, according to the results of ROS formation, as shown with EPR spectroscopy and fluorescent probes tools. Furthermore, the Fe2+ concentration on the surface of BiVO4/Fh was higher than that on Fh based on the results of XPS characterization and quantitative measurement with a 1,10-phenanthroline spectrophotometric method. These results demonstrated that the introduction of BiVO4 can accelerate the reduction of Fe3+ to Fe2+ by transferring photogenerated electrons from BiVO4 to Fe3+ on the surface of Fh. Meanwhile, a higher decolorization efficiency of acid red 18 by BiVO4/Fh than by Fh and pure BiVO4 verified that the introduction of BiVO4 can significantly enhance the photo-Fenton catalytic activity of Fh even at near-neutral pH. Overall, our work has important implications for understanding the photo-Fenton mechanisms on semiconductor modified heterogeneous photo-Fenton catalysts and confirms that the introduction of a semiconductor can enhance the photo-Fenton catalytic activity of heterogeneous photo-Fenton catalysts in acidic and neutral pH.
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      PubDate: 2017-05-02T15:13:05Z
      DOI: 10.1016/j.apcatb.2017.04.064
      Issue No: Vol. 212 (2017)
       
  • Cobalt-containing BEA zeolite for catalytic combustion of toluene
    • Authors: Anna Rokicińska; Marek Drozdek; Barbara Dudek; Barbara Gil; Piotr Michorczyk; Dalil Brouri; Stanislaw Dzwigaj; Piotr Kuśtrowski
      Pages: 59 - 67
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Anna Rokicińska, Marek Drozdek, Barbara Dudek, Barbara Gil, Piotr Michorczyk, Dalil Brouri, Stanislaw Dzwigaj, Piotr Kuśtrowski
      Co-containing HAlBEA zeolite was obtained by conventional wet impregnation of HAlBEA zeolite with an aqueous Co(NO3)2 .6H2O solution, whereas Co-containing SiBEA zeolites were prepared by a two-step post-synthesis method. This approach consists of, in the first step, dealumination of parent BEA zeolite to obtain an aluminium-free SiBEA support and then, in the subsequent step, contact of the obtained material with an aqueous solution of cobalt nitrate. As shown by X-ray diffraction and low-temperature N2 adsorption, the dealumination of BEA zeolite and introduction of cobalt ions did not involve destruction of zeolite structure, and only insignificant blocking of pore system was observed after introduction of high amounts of cobalt. Nevertheless, clear changes in acidity were found by FTIR of pre-adsorbed pyridine after dealumination of parent BEA zeolite and introduction of cobalt ions. The presence of Lewis acid sites resulted in enhanced selectivity to CO and benzene formed as by-products in the toluene combustion. Therefore, SiBEA zeolite was chosen as a support for an introduction of various amounts of Co into the zeolite structure (the intended Co contents of 3.0–9.0wt%). Depended on the amount of the introduced Co, cobalt was incorporated into the framework of BEA zeolite as isolated mononuclear Co(II) species, small Co(II) oxide clusters and/or Co3O4 crystallites distributed in the whole zeolite structure. The chemical environment and dispersion of cobalt species were studied by transmission electron microscopy (TEM), FTIR of pre-adsorbed NO, UV–vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy (XPS). Temperature-programmed reduction of hydrogen (H2-TPR) was also performed to determine reducibility of the Co-containing SiBEA zeolites. It was confirmed that siliceous SiBEA zeolite was the excellent support of Co3O4, which was in turn recognized as the main active phase in the total oxidation of toluene. The best catalytic performance was achieved over the catalysts containing at least 0.05mmol of Co in the form of Co3O4 per 1g of SiBEA zeolite.
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      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.067
      Issue No: Vol. 212 (2017)
       
  • Enhanced catalytic activity of Ni on η-Al2O3 and ZSM-5 on addition of
           ceria zirconia for the partial oxidation of methane
    • Authors: Ahmed I. Osman; Jonathan Meudal; Fathima Laffir; Jillian Thompson; David Rooney
      Pages: 68 - 79
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Ahmed I. Osman, Jonathan Meudal, Fathima Laffir, Jillian Thompson, David Rooney
      Nickel supported on η-Al2O3 and ZSM-5(80) catalysts with and without the addition of ceria-zirconia, were prepared by co-precipitation and wet impregnation methods and used for the low temperature catalytic partial oxidation of methane (CPOM). The catalysts were tested under reaction temperatures of between 400 and 700°C with a WHSV of 63,000mLg−1 h−1. The activity of the catalyst was found to be dependent on the support and preparation method. The optimum catalyst composition of those tested was 10% Ni on 25%CeO2-ZrO2/ZSM-5(80), prepared by co-precipitation, where the reaction reached equilibrium conversion at 400°C (T50% <400°C), which is one of the lowest temperatures reported to date. Further increases in temperature led to improved selectivity to CO reaching 60% at 600°C. Although the observed kinetics were found to be controlled by strong adsorption of CO at lower temperature, this was an equilibrium limitation with longer time on stream experiments showing no decrease in the catalyst activity over 25h at 400°C.
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      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2016.12.058
      Issue No: Vol. 212 (2017)
       
  • Construction of dual-channel for optimizing Z-scheme photocatalytic system
    • Authors: Lulu Zhang; Wenhui Feng; Bo Wang; Kaiqiang Wang; Fan Gao; Yan Zhao; Ping Liu
      Pages: 80 - 88
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Lulu Zhang, Wenhui Feng, Bo Wang, Kaiqiang Wang, Fan Gao, Yan Zhao, Ping Liu
      A ternary all-solid-state visible-light Z-scheme photocatalytic system BiVO4/Au@CdS is prepared by means of a two-step route, which is selectively built on the {010} facet of BiVO4 crystals in this system. Vectorial migration of photogenerated charge carriers through two order transmission channels in Z-scheme photocatalytic system further prolongs the mean free path of electrons, realizing effective separation of photogenerated charge carriers and possesses high redox ability. As expected, such BiVO4/Au@CdS Z-scheme photocatalytic system exhibits highly efficient photocatalytic performance. Our current work is expected to offer new insight into construction of dual separation channels for rational design and compound of photocatalyst with high performance.
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      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.049
      Issue No: Vol. 212 (2017)
       
  • Remarkable improvement of the turn–on characteristics of a Fe2O3
           photoanode for photoelectrochemical water splitting with coating a FeCoW
           oxy–hydroxide gel
    • Authors: Jingran Xiao; Huali Huang; Qiuyang Huang; Xiang Li; Xuelan Hou; Le Zhao; Rui Ma; Hong Chen; Yongdan Li
      Pages: 89 - 96
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Jingran Xiao, Huali Huang, Qiuyang Huang, Xiang Li, Xuelan Hou, Le Zhao, Rui Ma, Hong Chen, Yongdan Li
      A FeCoW oxy–hydroxide gel coated Fe2O3 film photoanode has been examined for photoelectrochemical (PEC) water oxidation reaction. The FeCoW coating acts as a hole storage layer, resulting in efficient hole extraction from Fe2O3 for water oxidation. In addition, the surface state of FeCoW/Fe2O3 shifts to higher position, thus allows for a lower turn–on voltage (V on) of the photocurrent. The composite anode exhibits an 84% increase of the photocurrent, at 1.23V versus reversible hydrogen electrode (RHE), over the bare Fe2O3 photoanode. The V on is as low as 0.67V vs. RHE. The applied bias photon–to–current efficiency of the composite is 2.7 times higher than that of the bare Fe2O3. Moreover, an extremely low bias photoresponse of 0.45V vs. RHE and a good stability are observed with the FeCoW/Fe2O3 photoanode. Besides, with changing of the thickness of the FeCoW coating slurry, the PEC performance of the FeCoW/Fe2O3 photoanode can be tuned.
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      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.075
      Issue No: Vol. 212 (2017)
       
  • Synthesis and performance of ceria-zirconia supported Ni-Mo nanoparticles
           for partial oxidation of isooctane
    • Authors: Qusay Bkour; Kai Zhao; Louis Scudiero; Da Jung Han; Chang Won Yoon; Oscar G. Marin-Flores; M. Grant Norton; Su Ha
      Pages: 97 - 105
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Qusay Bkour, Kai Zhao, Louis Scudiero, Da Jung Han, Chang Won Yoon, Oscar G. Marin-Flores, M. Grant Norton, Su Ha
      Catalyst deactivation due to sintering and carbon deposition is one of the main issues associated with electrocatalysis and catalytic hydrocarbon reforming over supported Ni catalysts. We report a Ni-Mo bimetallic catalyst supported on ceria-zirconia (CZ) prepared using co-impregnation as an efficient catalyst for partial oxidation of isooctane at high space velocities. It is also used as a catalytic micro-reforming layer on a conventional Ni/YSZ-based solid oxide fuel cell (SOFC) to form a bi-layer anode. The catalysts were characterized using a number of analytical techniques and catalyst performance for partial oxidation of isooctane was investigated at 750°C; atmospheric pressure; air and fuel flow rates of 100sccm and 3ml/h, respectively; and O2/C ratio of 0.4. The addition of Mo increases the catalytic activity in terms of isooctane conversion and syngas yields. Most significantly, the presence of Mo enhances the long-term stability of the Ni-based catalyst. Molybdenum strengthens the interaction between Ni and the support and improves the overall metal dispersion. We have further demonstrated that the carbon tolerance of Ni can be significantly improved by Mo addition. When applied it as a reforming layer in a SOFC running on isooctane, the cell showed a very slow degradation rate of 4.8mVh−1 during 12h of operation at 750°C. The excellent catalytic activity and stability suggest that Ni-Mo/CZ is an excellent material for a bi-layer anode of SOFC with superior coke tolerance.
      Graphical abstract image

      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.055
      Issue No: Vol. 212 (2017)
       
  • Effect of the calcination temperature on the visible light photocatalytic
           activity of direct contact Z-scheme g-C3N4-TiO2 heterojunction
    • Authors: Juan Li; Min Zhang; Xuan Li; Qiuye Li; Jianjun Yang
      Pages: 106 - 114
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Juan Li, Min Zhang, Xuan Li, Qiuye Li, Jianjun Yang
      Z-scheme g-C3N4-TiO2 heterojunctions containing g-C3N4 nanosheets with different thickness were prepared by sintering the mixture of g-C3N4 and nanotube titanic acid (denoted as NTA) at different temperatures in air. As-prepared Z-scheme g-C3N4-TiO2 heterojunctions were characterized by X-ray diffraction, transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, ultraviolet-visible light diffuse reflectance spectrometry, electron spin resonance, and photoluminescence spectrometry. Findings indicate that the annealing temperature has crucial effects on the visible-light photocatalytic activity (λ ≥420nm) of the as-prepared Z-scheme g-C3N4-TiO2 heterojunctions. The Ti3+ and porous g-C3N4 nanosheets formed upon the calcination at 600°C as well as the low concentration of bulk single-electron trapped oxygen vacancy are favorable to the transport of the photoexcited charge carriers. This, in association with the Z-scheme system, contributes to improving the photocatalytic activity of g-C3N4-TiO2 photocatalysts. As a result, g-C3N4-TiO2 photocatalyst prepared at 600°C exhibits good photocatalytic activity towards the degradation of propylene and hydrogen generation by water-splitting under visible light irradiation.
      Graphical abstract image

      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.061
      Issue No: Vol. 212 (2017)
       
  • Fabrication of ternary g-C3N4/Al2O3/ZnO heterojunctions based on cascade
           electron transfer toward molecular oxygen activation
    • Authors: Shao-jia Liu; Fa-tang Li; Yi-lei Li; Ying-juan Hao; Xiao-jing Wang; Bo Li; Rui-hong Liu
      Pages: 115 - 128
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Shao-jia Liu, Fa-tang Li, Yi-lei Li, Ying-juan Hao, Xiao-jing Wang, Bo Li, Rui-hong Liu
      The mismatches of lattices and energy bands in heterojunction are the dominant factors restricting the generation efficiency of reactive oxygen species (ROS) that are powerful tools for water purification and anti-bacteria. In this paper, the mediated lattice matching role of amorphous Al2O3 is presented for constructing the ternary g-C3N4/Al2O3/ZnO heterojunctions, which exhibit higher molecular oxygen activation performance than binary g-C3N4/ZnO and g-C3N4/Al2O3 heterojunctions. The oxygen activation ability and the ROS generation were testified by the electron paramagnetic resonance (EPR) measurement, transformation of nitroblue tetrazolium (NBT) and degradation of methylene blue (MB). The ROS include superoxide anion radical (O2 −) and consequent product of hydroxyl radical (OH). The superior oxygen activation performance of the ternary heterojunctions can be attributed to the lattices matching of the mediated amorphous Al2O3 and the resultant efficient cascade electron transfer.
      Graphical abstract image

      PubDate: 2017-05-08T01:33:21Z
      DOI: 10.1016/j.apcatb.2017.04.072
      Issue No: Vol. 212 (2017)
       
  • Activation of Pd/SSZ-13 catalyst by hydrothermal aging treatment in
           passive NO adsorption performance at low temperature for cold start
           application
    • Authors: YoungSeok Ryou; Jaeha Lee; Sung June Cho; Hyokyoung Lee; Chang Hwan Kim; Do Heui Kim
      Pages: 140 - 149
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): YoungSeok Ryou, Jaeha Lee, Sung June Cho, Hyokyoung Lee, Chang Hwan Kim, Do Heui Kim
      Pd/SSZ-13 catalysts after hydrothermal aging (HTA) treatment at 750°C for 25h showed enhanced passive NO adsorption performance at temperature below 120°C, which will be suitable for cold start application, although those calcined at 500°C did not possess good NO adsorption capacity irrespective of the preparation methods such as incipient wetness impregnation, wet impregnation, ion-exchange, and solid state ion exchange. NO adsorption ability of HTA treated Pd/SSZ-13 samples increases gradually as a function of the metal content, up to 2wt% Pd loading, and then decreased implying that there is an optimum chemistry between the metal and zeolite support. Combined H2-TPR and Pd XAFS results clearly demonstrate that PdO mainly existed over the fresh samples, whereas HTA treated samples contained ionic Pd2+ species, indicating the redistribution of PdO into highly dispersed Pd2+ species within the SSZ-13 structure arising from HTA treatment. Such phenomenon was visually confirmed by comparative STEM-EDS analysis of fresh and HTA Pd/SSZ-13 samples. DRIFT results display the formation of two nitrosyl complexes adsorbed on Pd2+ ions, which are directly related to two desorption peaks of NOx at 250 and 400°C. All combined results provide the unambiguous evidence about the generation of Pd ions in SSZ-13 zeolite induced by HTA treatment, which play as the active sites for NO adsorption at low temperature.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.04.077
      Issue No: Vol. 212 (2017)
       
  • Synthesis, characterization and application of magnetic carbon materials
           as electron shuttles for the biological and chemical reduction of the azo
           dye Acid Orange 10
    • Authors: L. Pereira; P. Dias; O.S.G.P. Soares; P.S.F. Ramalho; M.F.R. Pereira; M.M. Alves
      Pages: 175 - 184
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): L. Pereira, P. Dias, O.S.G.P. Soares, P.S.F. Ramalho, M.F.R. Pereira, M.M. Alves
      A set of core(ferrite, FeO)-shell(carbon, C) composites, C@FeO, C@MnFeO, C@CoFeO, and carbon nanotubes (CNT) impregnated with 2% of Fe (CNT@2%Fe) were prepared. The different composites were tested as redox mediators (RM) in the biological reduction of the azo dye Acid Orange 10 (AO10). Materials were tested at different concentrations from 0.1 to 1.0gL−1. In the absence of RM, the AO10 decolourisation after 24h of reaction was only 30% at a rate of 0.2d−1. In the presence of the core-shell composites, better results were obtained with C@FeO materials at the amount of 1.0gL−1. The extent of AO10 decolourisation was above 90% and rate improved circa 29-fold. With CNT@2%Fe, the best efficiency (98±3%) was achieved with 0.5gL−1 leading to a 79-fold rate increase. In abiotic controls, though at lower extent, the reduction of the dyes also occurred likely due to the electron transfer from Fe2+ to carbon and then to the dye. To prove this, assays combining single CNT and FeO materials were performed, and FeO had effect in the reaction only when combined with CNT. In the biological assay, the rate was the double and the percentage of decolourisation increased from (88±6)% to (97±1)%, when both materials were present in solution as compared with results in the presence of CNT alone. Under abiotic conditions, decolourisation occurred only in the presence of both materials, with a final percentage of (54±2)%. Owing to their magnetic character, materials were removed from the media and successfully applied in successive cycles.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.04.060
      Issue No: Vol. 212 (2017)
       
  • Efficient enantioselective degradation of the inactive (S)-herbicide
           dichlorprop on chiral molecular-imprinted TiO2
    • Authors: Ya-Nan Zhang; Weiguo Dai; Yuezhong Wen; Guohua Zhao
      Pages: 185 - 192
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Ya-Nan Zhang, Weiguo Dai, Yuezhong Wen, Guohua Zhao
      The chiral compound 2-(2,4-dichlorophenoxy) propionic acid (DCPP) is a widely used herbicide; the active (R)-DCPP enantiomer has been reported to often be preferentially degraded, whereas the inactive (S)-DCPP with greater toxicity remains in the environment. In this study, we achieved efficient enantioselective recognition and controllable degradation of (S)-DCPP on a photoelectrocatalytic (PEC) surface by introducing a molecular imprinting technique. We fabricated an (S)-DCPP-molecular-imprinted single-crystalline TiO2 (S-TiO2 (SC)) photoelectrode in situ by constructing (S)-DCPP molecular imprinting sites on the surface of 1D single-crystalline TiO2 nanorods. The results revealed that the S-TiO2 (SC) exhibited higher PEC oxidation activity (0.500mA/cm2) and electrochemical surface adsorption (4.37×10−12 molcm−2 mg) against the target (S)-DCPP than against the non-target (R)-DCPP. Additionally, the S-TiO2 (SC) achieved excellent enantioselective PEC degradation of (S)-DCPP in both the single component and racemic systems. The k value of (S)-DCPP was 0.156h−1 after 6h, which was 2.6 times greater of (R)-DCPP (0.060h−1). Finally, when (S)-DCPP was present with 100-fold concentration of (R)-DCPP and five other contaminants, a greater anti-interference ability was demonstrated by S-TiO2 (SC). This study highlights the need for further investigations on the enantioselective degradation of a specific enantiomer in chiral enantiomers.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.04.062
      Issue No: Vol. 212 (2017)
       
  • Eco-friendly photocatalysts achieved by zeolite fixing
    • Authors: Runyuan Ma; Liang Wang; Sai Wang; Chengtao Wang; Feng-Shou Xiao
      Pages: 193 - 200
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Runyuan Ma, Liang Wang, Sai Wang, Chengtao Wang, Feng-Shou Xiao
      Photocatalysts for pollutant degradation have been extensively investigated but extremely challenging for practical applications, because the radicals formed on the catalyst surface are pernicious to organisms in the nature. We develop a new concept of eco-friendly photocatalyst to impart shape-selective catalysis for pollutants removal but eco-friendly for organisms. The proof-of-concept design is demonstrated by fixing conventional photocatalysts (e.g. TiO2, Pt/TiO2) inside of zeolite crystals to form a pomegranate-like structure, as confirmed by electron microscopy and FTIR spectroscopy. In the photodegradation with chlorophyll molecules and grasses as model of the organisms, the zeolite-fixed photocatalysts give ideal performances for the selective degradation of pollutants but are harmless to the organisms, outperforming the conventional photocatalysts. This unique phenomenon is reasonably attributed to the shape-selectivity of the zeolite sheath with uniform micropores, where the pollutant molecules with sizes less than zeolite micropores could be diffused but bulky organisms are hindered to access to the radicals on the TiO2 surface.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2017.04.071
      Issue No: Vol. 212 (2017)
       
  • Enhanced photocatalytic conversion of greenhouse gas CO2 into solar fuels
           over g-C3N4 nanotubes with decorated transparent ZIF-8 nanoclusters
    • Authors: Shengwei Liu; Feng Chen; Sitan Li; Xingxing Peng; Ya Xiong
      Pages: 1 - 10
      Abstract: Publication date: 15 August 2017
      Source:Applied Catalysis B: Environmental, Volume 211
      Author(s): Shengwei Liu, Feng Chen, Sitan Li, Xingxing Peng, Ya Xiong
      The atmospheric concentration of CO2 as the dominant greenhouse gas continues to rise and has become a global environmental issue. Photocatalytic CO2 reduction into solar fuels has been regarded as an ideal solution to reduce CO2 emissions and to use solar energy. Graphitic carbon nitride (g-C3N4) is one of the most promising visible-light-driven photocatalysts for CO2 reduction. Unfortunately, the CO2 reduction performance of g-C3N4 based photocatalyst is normally limited by the inferior charge separation ability and limited CO2 adsorption capacity. In this study, two cooperative strategies, that is, combined host nanostructural design and surface guest grafting, are adopted to overcome the aforementioned drawbacks. Specifically, holey graphitic carbon nitride (g-C3N4) nanotubes were firstly fabricated to modify the light-harvesting ability, the redox potential as well as the charge separation efficiency. And then, the as-prepared tubular g-C3N4 was decorated with suitable amount of transparent zeolitic imidazolate framework-8 (ZIF-8) nanoclusters to further increase CO2 capture capacity without sacrifice of light absorption capacity. Because of the cooperative effects of nanostructural design and surface grafting, the optimized ZIF-8 modified tubular g-C3N4 photocatalysts exhibit a great enhancement in photocatalytic CH3OH production efficiency by more than 3 times, relative to the bulk g-C3N4 (BCN) photocatalyst synthesized by conventional pyrolysis of melamine. This work will enlighten a promising strategy to construct efficient photocatalyst for greenhouse gas CO2 resourcing, by taking advantage of the cooperative effects of semiconductor nanostructures and surface metal-organic framework grafters.
      Graphical abstract image

      PubDate: 2017-04-18T03:34:09Z
      DOI: 10.1016/j.apcatb.2017.04.009
      Issue No: Vol. 211 (2017)
       
  • Effect of core@shell (Au@Ag) nanostructure on surface plasmon-induced
           photocatalytic activity under visible light irradiation
    • Authors: Sunao Kamimura; Shinpei Yamashita; Shungo Abe; Toshiki Tsubota; Teruhisa Ohno
      Pages: 11 - 17
      Abstract: Publication date: 15 August 2017
      Source:Applied Catalysis B: Environmental, Volume 211
      Author(s): Sunao Kamimura, Shinpei Yamashita, Shungo Abe, Toshiki Tsubota, Teruhisa Ohno
      We prepared Au-Ag nanoparticles (NPs) with two different morphologies over SrTiO3 to investigate the effect of composite nanostructure on surface plasmon-induced photocatalytic activity; core@shell (Au@Ag) NPs were synthesized by a multi-step citric reduction method, and Au-Ag bimetallic NPs were prepared by a photo-reduction method. (Au@Ag)/SrTiO3 and Au-Ag/SrTiO3 showed strong photoabsorption in the visible light response due to a localized surface plasmon resonance (LSPR) of Ag. Moreover, they could oxidize 2-propanol to acetone and CO2 under visible light irradiation (440<λ<800nm). From a comparison of action spectra for acetone evolution and the Kubelka-Munk function, it was confirmed that photocatalytic activities of (Au@Ag)/SrTiO3 and Au-Ag/SrTiO3 were induced by photoabsorption based on LSPR excitation of Ag. Interestingly, the rate of acetone evolution over (Au@Ag)/SrTiO3 was 1.5-times higher than that of over Au-Ag/SrTiO3, suggesting that the core@shell (Au@Ag) nanostructure contributes to the efficient surface plasmon-induced photocatalytic activity.
      Graphical abstract image

      PubDate: 2017-04-18T03:34:09Z
      DOI: 10.1016/j.apcatb.2017.04.028
      Issue No: Vol. 211 (2017)
       
  • Lignin-derived Pt supported carbon (submicron)fiber electrocatalysts for
           alcohol electro-oxidation
    • Authors: F.J. García-Mateos; T. Cordero-Lanzac; R. Berenguer; E. Morallón; D. Cazorla-Amorós; J. Rodríguez-Mirasol; T. Cordero
      Pages: 18 - 30
      Abstract: Publication date: 15 August 2017
      Source:Applied Catalysis B: Environmental, Volume 211
      Author(s): F.J. García-Mateos, T. Cordero-Lanzac, R. Berenguer, E. Morallón, D. Cazorla-Amorós, J. Rodríguez-Mirasol, T. Cordero
      Lignin fibers, with and without phosphorus, and loaded with platinum have been prepared in a single step by electrospinning of lignin/ethanol/phosphoric acid/platinum acetylacetonate precursor solutions. Thermochemical treatments have been carried out to obtain lignin-based carbon fiber electrocatalysts. The electrospun lignin fibers were thermostabilized in air and carbonized at 900°C. The effect of phosphorus and platinum content on the porous texture, the surface chemistry and the oxidation/electro-oxidation resistance have been studied. Phosphorus-containing carbon fibers develop a higher surface area (c.a. 1200m2 g−1), exhibit a lower Pt particle size (2.1nm) and a better particle distribution than their counterpart without phosphorus (c.a. 750m2 g−1 of surface area and 9.6nm Pt particle size). It has been proved that phosphorus improves the oxidation and electro-oxidation resistance of the fibers, avoiding their oxidation during the preparation thermal stages and is responsible of the generation of a microporous material with an unusual wide operational potential window (1.9V). An important Pt–P synergy has been observed in the oxygen transfer during the oxidation and electro-oxidation of the fibers. The obtained carbon fibers can act directly as electrodes without any binder or conductivity promoter. The fibers with platinum have shown outstanding catalyst performance in the electro-oxidation of methanol and ethanol.
      Graphical abstract image

      PubDate: 2017-04-25T10:53:54Z
      DOI: 10.1016/j.apcatb.2017.04.008
      Issue No: Vol. 211 (2017)
       
  • Hydrated electron (eaq−) generation from p-benzoquinone/UV: Combined
           experimental and theoretical study
    • Authors: Jia Gu; Jun Ma; Jin Jiang; Ling Yang; Jingxin Yang; Jianqiao Zhang; Huizhong Chi; Yang Song; Shaofang Sun; Wei Quan Tian
      Pages: 585 - 593
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Jia Gu, Ling Yang, Jun Ma, Jin Jiang, Jingxin Yang, Jianqiao Zhang, Huizhong Chi, Yang Song, Shaofang Sun, Wei Quan Tian
      A p-benzoquinone (p-BQ)/UV process to induce hydrated electron (eaq −) generation was predicted by quantum chemical calculations and validated by experiment in this work. Theoretically, the photolysis of p-BQ under UV irradiation at 253.7nm could induce water to generate eaq − with a molar ratio of 1:2 via the direct triplet mechanism, in which 1,4-addition reaction of the first triplet state of p-BQ with water was the key step. Experimentally, monochloroacetic acid (MCAA) (the probe of eaq −) was used to detect eaq − generated in the p-BQ/UV process. The generation efficiency showed a positive linear dependence on the p-BQ concentration, which illustrated the crucial role of p-BQ on the generation of eaq −. During the photolysis, p-hydroquinone was the primary intermediate for the generation of eaq −. Kinetically, the energy barriers of the eaq − generation from p-HOC6H4OH, p-HOC6H4O− and p-−OC6H4O− were 100.8kcalmol−1, 46.5kcalmol−1 and 5.6kcalmol−1, respectively. Both the experimental and theoretical results show that the generation of eaq − was much more efficient from the anions than that from p-HOC6H4OH. The findings in the present study may help to understand the mechanism of eaq − generation from natural organic matters (NOM), since quinone-like groups are usually contained in NOM.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
      DOI: 10.1016/j.apcatb.2016.07.034
      Issue No: Vol. 200 (2017)
       
  • Ni/CeO2 based catalysts as oxygen vectors for the chemical looping dry
           reforming of methane for syngas production
    • Authors: Axel Guerrero-Caballero; Tanushree Kane Annick Rubbens Louise Jalowiecki-Duhamel
      Abstract: Publication date: 5 September 2017
      Source:Applied Catalysis B: Environmental, Volume 212
      Author(s): Axel Löfberg, Jesús Guerrero-Caballero, Tanushree Kane, Annick Rubbens, Louise Jalowiecki-Duhamel
      Chemical looping dry reforming of methane (CLDRM) is performed by exposing a Ni/CeO2 solid to CH4 and CO2 in a cyclic way. The solid acts as an oxygen vector producing syngas (CO+H2) during exposure to CH4, and is re-oxidized during exposure to CO2. Absence of CO2 during syngas production allows suppressing reverse water gas shift reaction and reaching high selectivity. Exposure to CO2 restores the oxygen capacity of the support and removes residual carbon formed at the surface, thus fully regenerating the catalyst. Solids were characterized by TPR, XRD, Raman scattering, and XPS. Results show that part of the Ni is reduced and remain in metallic state during the looping process. On the other hand, Ni2+ species in strong interaction with Ce cations are observed even after exposure to methane. Both Ni species play important roles on reactants activation and oxygen supply by the solid. Ni loading is a crucial parameter for controlling the reduction behavior of the support and therefore for CLDRM process optimization.
      Graphical abstract image

      PubDate: 2017-05-12T14:49:41Z
       
 
 
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