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  Subjects -> ENGINEERING (Total: 2267 journals)
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ENGINEERING (1196 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: 1)
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: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
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: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
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: 13)
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  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
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: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
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 Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
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: 8)
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: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
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: 4)
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: 5)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
Composites Part B : Engineering     Hybrid Journal   (Followers: 224)
Composites Science and Technology     Hybrid Journal   (Followers: 164)
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: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
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  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | Last

Journal Cover Chinese Journal of Catalysis
  [SJR: 0.6]   [H-I: 29]   [2 followers]  Follow
    
   Full-text available via subscription Subscription journal  (Not entitled to full-text)
   ISSN (Print) 1872-2067
   Published by Elsevier Homepage  [3032 journals]
  • Preface to Special Column on Novel Catalysts for Energy and Environmental
           Issues
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Atsushi Fukuoka


      PubDate: 2017-04-10T02:08:53Z
       
  • Conversion of glycerol to acrolein by mesoporous sulfated zirconia-silica
           catalyst
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Hirokazu Kobayashi, Shogo Ito, Kenji Hara, Atsushi Fukuoka
      A mesoporous sulfated zirconia-silica catalyst bearing only Brønsted acid sites converted glycerol to acrolein in 81% yield with 82% selectivity. Space time yield as high as 9.0 mmol h−1 gcat −1 was achieved even at a low reaction temperature of 523 K. The catalytic activity and selectivity were higher than those of typical sulfated zirconia. It is proposed that the milder acidity due to dilution of zirconium species by silica and large pore size for faster diffusion contributed towards the better catalytic performance.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Preparation of Sn-β-zeolite via immobilization of Sn/choline chloride
           complex for glucose-fructose isomerization reaction
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Asep Bayu, Surachai Karnjanakom, Katsuki Kusakabe, Abuliti Abudula, Guoqing Guan
      Well dispersion of tin species in an isolated form is a quite challenge since tin salts are easily hydrolyzed into (hydr)oxides during aqueous stannation of β-zeolite. In this study, immobilization of tin species on high silica commercial β-zeolite by using SnCl2/Choline chloride (ChCl) complex followed with calcination provided a convenient way to get well dispersed Sn in β-zeolite in the aqueous condition, which was observed based on electron microscopy images, UV visible spectra and X-ray diffraction pattern. The existence of ChCl facilitated tin species to incorporate into zeolite. (1−2) wt% of Sn loaded β-zeolites exhibited good catalytic activity and high selectivity for glucose-fructose isomerization reaction.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Reductive transformation of CO2: Fluoride-catalyzed reactions with waste
           silicon-based reducing agents
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Ken Motokura, Masaki Naijo, Sho Yamaguchi, Akimitsu Miyaji, Toshihide Baba
      CO2 is one of the most important “renewable” carbon sources. To transform CO2 to useful organic compounds, we examined the reactivity of two model silicon-based “waste” materials, disilanes and metallic Si powder, as reducing agents. In these reactions, fluoride salts were found to be active catalysts: CO2 was converted to formic acid at atmospheric pressure in the presence of H2O as a proton source and the silicon-based reducing reagents. Based on in-situ NMR and kinetics analyses, a hydrosilane and penta-coordinate Si species are proposed as the reaction intermediate and active species, respectively.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Photocatalytic aerobic oxidation of toluene and its derivatives to
           aldehydes on Pd/Bi2WO6
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Bo Yuan, Bao Zhang, Zhiliang Wang, Shengmei Lu, Jun Li, Yan Liu, Can Li
      The selective oxidation of toluene and its derivatives is extremely important in the chemical industry. The use of photocatalysis in organic synthesis has attracted considerable attention among synthetic chemists because of its “green” environmental characteristics. In this study, nanoscale Bi2WO6 with a flower-like morphology was found to be a highly efficient photocatalyst in the catalytic oxidation of toluene and its derivatives using O2 as the oxidant. The loading of Pd nanoparticles as a cocatalyst onto the flower-like Bi2WO6 was found to produce a significant enhancement in the catalytic activity. Mechanistic investigation showed that the superior performance of Pd/Bi2WO6 could be attributed to the improvement of both the reductive and oxidative abilities of Bi2WO6 by the loading of the cocatalyst.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Preparation and characterization of ternary magnetic g-C3N4 composite
           photocatalysts for removal of tetracycline under visible light
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Xu Tang, Liang Ni, Juan Han, Yun Wang
      A stable PNIPAM/Fe3O4/g-C3N4 composite photocatalyst was designed and prepared by a thermal photoinitiation technology. The structure and properties of the materials were characterized and the composite photocatalyst was found to show good stability for tetracycline degradation. The sample not only retained the magnetic properties of Fe3O4, allowing it to be recycled, but its photocatalytic properties could also be changed by controlling the temperature of the reaction system. The degradation intermediate products of tetracycline were further investigated by MS. This work provides a new facile strategy for the development of intelligent and recyclable photocatalytic materials.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Synthesis and characterization of PMoV/Fe3O4/g-C3N4 from melamine: An
           industrial green nanocatalyst for deep oxidative desulfurization
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Ezzat Rafiee, Maryam Khodayari
      A facile approach to the preparation of a novel magnetically separable H5PMo10V2O40/Fe3O4/g-C3N4 (PMoV/Fe3O4/g-C3N4) nanocomposite by chemical impregnation is demonstrated. The prepared nanocomposite was characterized and its acidity was measured by potentiometric titration. PMoV/Fe3O4/g-C3N4 showed high catalytic activity in the selective oxidative desulfurization of sulfides to their corresponding sulfoxides or sulfones. The catalytic oxidation of a dibenzothiophene (DBT)-containing model oil and that of real oil were also studied under optimized conditions. In addition, the effects of various nitrogen compounds, as well as the use of one- and two-ring aromatic hydrocarbons as co-solvents, on the catalytic removal of sulfur from DBT were investigated. The catalyst was easily separated and could be recovered from the reaction mixture by using an external magnetic field. Additionally, the remaining reactants could be separated from the products by simple decantation if an appropriate solvent was chosen for the extraction. The advantages of this nanocatalyst are its high catalytic activity and reusability; it can be used at least four times without considerable loss of activity.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Synthesis of biaryls using palladium nanoparticles immobilized on peptide
           nanofibers as catalyst and hydroxybenzotriazole as novel phenylating
           reagent
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Arash Ghorbani-Choghamarani, Zahra Taherinia
      Peptide nanofibers decorated with palladium nanoparticles catalyzed direct coupling of aryl halides with hydroxybenzotriazole to afford the corresponding biaryls in good to excellent yields. The coupling reactions proceeded under simple, green, and mild conditions. The peptide nanofibers were used as recyclable supports in the coupling reactions. This approach is the first to use hydroxybenzotriazole as a phenylating agent.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Pt-CeO2/SiO2 catalyst for CO oxidation in humid air at ambient temperature
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Shirish S. Punde, Bruce J. Tatarchuk
      CO self-poisoning and slow surface kinetics pose major challenges to a CO oxidation catalyst that should work at ambient temperature. Furthermore, the presence of moisture would cause passivation of the catalyst. A highly active ceria promoted Pt catalyst (4%Pt-12%CeO2/SiO2; conversion ≥ 99% at low (< 500 ppm) and high (> 2500 ppm) CO concentrations was developed for CO oxidation at ambient temperature in humid air. Catalyst preparation variables such as Pt and CeO2 loading, ceria deposition method, drying and calcination conditions for the ceria and Pt precursors were optimized experimentally. The activity was correlated with surface properties using CO/H2 chemisorption, O2-H2 titration, X-ray diffraction and BET surface area analysis. The method of CeO2 deposition had a significant impact on the catalytic activity. CeO2 deposition by impregnation resulted in a catalyst that was three times more active than that prepared by deposition precipitation or CeO2 grafting. O2-H2 titration results revealed that the close association of ceria and Pt in the case of CeO2 deposition by impregnation resulted in higher activity. The catalyst support used was also crucial as a silica supported catalyst was five times more active than an alumina supported catalyst. The particle size and pore structure of the catalyst support were also crucial as the reaction was diffusion controlled. The drying and calcination conditions of the ceria and Pt precursors also played a crucial role in determining the catalytic activity. The Pt-CeO2/SiO2 catalysts with Pt > 2.5 wt% and CeO2 > 15 wt% were highly active (TOF > 0.02 s−1) and stable (conversion ≥ 99% after 15 h) at ambient conditions.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Surface treatment effect on the photocatalytic hydrogen generation of
           CdS/ZnS core-shell microstructures
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Jinzhan Su, Tao Zhang, Lu Wang, Jinwen Shi, Yubin Chen
      CdS/ZnS core-shell microparticles were prepared by a simple two-step method combining ultrasonic spray pyrolysis and chemical bath deposition. The core-shell structures showed enhanced photocatalytic properties compared with those of CdS or ZnS spherical particles. CdS/ZnS photocatalysts with different amount of ZnS loaded as shells were prepared by adjusting the concentrations of Zn and S precursors during synthesis. The optical properties and photocatalytic activity for hydrogen production were investigated and the amount of ZnS loaded as shell was optimized. Thermal annealing and hydrothermal sulfurization treatments were applied to the core-shell structure and both treatments enhanced the material's photocatalytic activity and stability by eliminating crystalline defects and surface states. The result showed that thermal annealing treatment improved the bulk crystallinity and hydrothermal sulfurization improved the surface properties. The sample subjected to both treatments showed the highest photocatalytic activity. These results indicate that CdS/ZnS core-shell microspheres are a simple structure that can be used as efficient photocatalysts. The hydrothermal sulfurization treatment may also be a useful surface treatment for metal sulfide photocatalysts. The simple two-step method provides a promising approach to the large-scale synthesis of core-shell microsphere catalysts.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Fabrication of porous g-C3N4 and supported porous g-C3N4 by a simple
           precursor pretreatment strategy and their efficient visible-light
           photocatalytic activity
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Zhenxing Zeng, Kexin Li, Kai Wei, Yuhua Dai, Liushui Yan, Huiqin Guo, Xubiao Luo
      Porous g-C3N4 and supported porous g-C3N4 were fabricated for the first time by a simple strategy using pretreated melamine as a raw material and pretreated quartz rod as a substrate. The formation of a richly porous microstructure can be attributed to the co-existence of different pore-fabricating units in the preparation system for porous g-C3N4. The richly porous microstructure endowed the as-prepared porous g-C3N4 with an excellent photocatalytic activity. The as-prepared supported porous g-C3N4 exhibited considerable stability because of the existence of chemical interaction between porous g-C3N4 and the quartz rod substrate. The photocatalytic activity of the supported porous g-C3N4 was competitive with that of porous g-C3N4 in powder form because neither the surface migration of photogenerated electrons nor the diffusion of the target organic pollutant were affected by the construction of the quartz rod reactor. The photocatalytic activity of the as-prepared porous g-C3N4 and supported porous g-C3N4 was preliminarily evaluated by the treatment of single-component organic wastewater under visible-light irradiation. Subsequently, the as-prepared porous g-C3N4 was further applied in conventional hydrogen evolution and a new system for simultaneous hydrogen evolution with organic-pollutant degradation. The hydrogen yield and degradation efficiency both increased with increasing photocatalytic activity of the as-prepared materials in the system for simultaneous hydrogen evolution with organic-pollutant degradation.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • Zinc-modified Pt/SAPO-11 for improving the isomerization selectivity to
           dibranched alkanes
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Zhichao Yang, Yunqi Liu, Jinchong Zhao, Jianxia Gou, Kaian Sun, Chenguang Liu
      Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane. Their physicochemical properties were investigated using powder X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption, pyridine-adsorbed infrared spectroscopy, temperature-programmed desorption of NH3, temperature-programmed reduction of hydrogen, temperature-programmed desorption of hydrogen, transmission electron microscopy, and X-ray photoelectron spectroscopy. The addition of zinc resulted in high dispersion of platinum. Zinc acted as a competitive adsorbent, changed the location of platinum. The catalyst with a zinc loading of 0.5% gave the highest selectivity to dimethylhexanes, but the conversion was lower than those achieved with the other catalysts. Dimethylhexanes have large molecular diameters, and therefore their diffusion may be difficult. This weakens the catalytic activity of the zinc-modified catalysts and lowers the n-octane conversion.
      Graphical abstract image

      PubDate: 2017-04-10T02:08:53Z
       
  • One-pot synthesis of ordered mesoporous Cu-KIT-6 and its improved
           catalytic behavior for the epoxidation of styrene: Effects of the pH value
           of the initial gel
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Baitao Li, Xin Luo, Jing Huang, Xiujun Wang, Zhenxing Liang
      The heterogeneously copper-catalyzed oxidative cleavage of styrene was studied using copper-doped mesoporous KIT-6 (Cu-KIT-6 x ) prepared via pH adjustment (where x is the pH: 1.43, 2.27, 3.78, 3.97, 4.24 or 6.62). Variations in the catalyst structure and morphology with pH values were characterized by X-ray power diffraction, nitrogen adsorption-desorption analysis, transmission electron microscopy and X-ray photoelectron spectroscopy. As the pH value applied during the initial synthesis, the resulting Cu-KIT-6 x exhibited different structural, textural and surface characteristics, especially in terms of specific copper species and copper content. At a pH value of 3.78, approximately 4.6 wt% copper(II) was successfully incorporated into the framework of the initial KIT-6, in the form of –Cu–O–Si– groups. The catalytic performance of each catalyst was evaluated by following the epoxidation of styrene, employing tert-butyl hydroperoxide as the oxidant and CH3CN as the solvent. A significant styrene conversion of 43.5% with 86.6% selectivity for the desired styrene epoxide was obtained over the Cu-KIT-63.78. A higher Cu content, an ordered cubic Ia3d mesoporous architecture and various specific textural characteristics all combined to endow the Cu-KIT-63.78 with high catalytic activity and good stability.
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      PubDate: 2017-04-10T02:08:53Z
       
  • PtSnNa/SUZ-4: An efficient catalyst for propane dehydrogenation
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Hualan Zhou, Jingjing Gong, Bolian Xu, Shengcai Deng, Yuanhua Ding, Lei Yu, Yining Fan
      The structure and catalytic properties of PtSn catalysts supported on SUZ-4 and ZSM-5 zeolite have been studied by using various experimental techniques including XRD, nitrogen adsorption, NH3-TPD, TG, H2-TPR and TPO techniques combined with propane dehydrogenation tests. It has been shown that SUZ-4-supported PtSnNa (PtSnNa/SUZ-4) was determined to be a better catalyst for propane dehydrogenation than conventional catalysts supported on ZSM-5, owing to its higher catalytic activity and stability. Dibenzothiophene poisoning experiments were performed to investigate the detailed structures of the two supported catalysts. The characterization of the two catalysts indicates that the distribution of Pt on the porous support affects the activity. In contrast to ZSM-5-supported catalysts, Pt particles on the PtSnNa/SUZ-4 are primarily dispersed over the external surface and are not as readily deactivated by carbon deposition. This is because that the strong acid sites of the SUZ-4 zeolite evidently prevented the impregnation of the Pt precursor H2PtCl6 into the zeolite. In contrast, the weak acid sites of the ZSM-5 zeolite led to more of the precursor entering the zeolite tunnels, followed by transformation to highly dispersed Pt clusters during calcination. In the case of the PtSnNa/ZSM-5, the interactions between Sn oxides and the support were lessened, owing to the weaker acidity of the ZSM-5 zeolite. The dispersed Sn oxides were therefore easier to reduce to the metallic state, thus decreasing the catalytic activity for hydrocarbon dehydrogenation.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Selective glycerol oxidation using platinum nanoparticles supported on
           multi-walled carbon nanotubes and nitrogen-doped graphene hybrid
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Mengyuan Zhang, Yanyan Sun, Juanjuan Shi, Wensheng Ning, Zhaoyin Hou
      Selective oxidation of glycerol is a hot topic. Increased biodiesel production has led to glycerol oxidation over Au- and Pt-based catalysts being widely studied. However, Pt catalysts suffer from deactivation because of weak metal-support interactions. In this study, multi-walled carbon nanotube (MWCNTs)-pillared nitrogen-doped graphene (NG) was prepared by direct pyrolysis of melamine on MWCNTs, and the synthesized NG-MWCNT composite was used as the support for Pt. Characterization results showed that the surface area (173 m2/g) and pore volume of the NG-MWCNT composite were greater than those of bare MWCNTs and the separated melamine pyrolysis product (CN x ). Pt (1.4 ± 0.4 nm) dispersion on the NG-MWCNTs was favorable and the Pt/NG-MWCNT catalyst was highly active and selective in the oxidation of glycerol to glyceric acid (GLYA) in base-free aqueous solution. For example, the conversion of glycerol reached 64.4% with a GLYA selectivity of 81.0%, whereas the conversions of glycerol over Pt/MWCNTs and Pt/CN x were 29.0% and 31.6%, respectively. The unique catalytic activity of the Pt/NG-MWCNTs is attributed to well-dispersed Pt clusters on the NG-MWCNTs and the electron-donating effect of the nitrogen dopant in the NG-MWCNTs.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Gold nanoparticle stabilization within tailored cubic mesoporous silica:
           Optimizing alcohol oxidation activity
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Wei Hong, Xiaoqing Yan, Renhong Li, Jie Fan
      Stabilizing gold nanoparticles (AuNPs) within a desired size range is critical to realize their promising catalytic performance in many important reactions. Herein, we investigate the anti-sintering properties of cubic mesoporous silica (FDU-12) as a function of pore entrance size. Simple adjustments to the type of organic template and reaction temperature enable the successful synthesis of FDU-12 with controllable entrance sizes (< 3, 3–5 and 7 nm). Excellent anti-sintering properties are observed for FDU-12 with a sub-5-nm entrance size (3–5 nm) over a wide loading concentration (1.0–8.3 wt%) and the AuNPs can be stabilized within a 4.5–5.0-nm range after calcination at 550 °C in air for 5 h. Smaller entrance size (< 3 nm) prevents ingress of 3-nm AuNPs to the mesopores and results in low loading capacity and sintering. Conversely, FDU-12 possessing a larger entrance size (7 nm) shows promising anti-sintering properties at high loading concentrations, although catalytic performance is significantly lost at lower concentrations (e.g. 2.1 wt%, 14.2 ± 5.5 nm). Different anti-sintering mechanisms are proposed for each of the different FDU-12 entrance sizes. Additionally, catalytic data indicates that the obtained 4.5-nm AuNPs supported on FDU-12 with a sub-5-nm entrance size exhibit excellent mass-specific activity (1544 mmol gAu –1 h–1) and selectivity (> 99%) at 230 °C for the gas-phase selective oxidation of cyclohexanol.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Promoting effects of Fe2O3 to Pt electrocatalysts toward methanol
           oxidation reaction in alkaline electrolyte
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Guihua Song, Haifang Yang, Yafei Sun, Jingyi Wang, Weidong Qu, Qiang Zhang, Lingjuan Ma, Yuanyuan Feng
      Fe2O3 nanorods and hexagonal nanoplates were synthesized and used as the promoters for Pt electrocatalysts toward the methanol oxidation reaction (MOR) in an alkaline electrolyte. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry and chronoamperometry. The results show that the presence of Fe2O3 in the electrocatalysts can promote the kinetic processes of MOR on Pt, and this promoting effect is related to the morphology of the Fe2O3 promoter. The catalyst with Fe2O3 nanorods as the promoter (Pt-Fe2O3/C-R) exhibits much higher catalytic activity and stability than that with Fe2O3 nanoplates as the promoter (Pt-Fe2O3/C-P). The mass activity and specific activity of Pt in a Pt-Fe2O3/C-R catalyst are 5.32 A/mgPt and 162.7 A/m2 Pt, respectively, which are approximately 1.67 and 2.04 times those of the Pt-Fe2O3/C-P catalyst, and 4.19 and 6.16 times those of a commercial PtRu/C catalyst, respectively. Synergistic effects between Fe2O3 and Pt and the high content of Pt oxides in the catalysts are responsible for the improvement. These findings contribute not only to our understanding of the MOR mechanism but also to the development of advanced electrocatalysts with high catalytic properties for direct methanol fuel cells.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Catalytic performance of Ag/Co-Ce composite oxides during soot combustion
           in O2 and NOx: Insights into the effects of silver
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Guchu Zou, Zeyun Fan, Xin Yao, Yi Zhang, Zhixiang Zhang, Mingxia Chen, Wenfeng Shangguan
      The composite oxides xAg/Co0.93Ce0.07 (x = Ag/(Co+Ce) molar ratio), intended for use as high performance catalytic materials, were successfully prepared via citric acid complexation. The effects of silver on the performance of these substances during soot combustion were subsequently investigated. Under O2, the 0.3Ag/Co0.93Ce0.07 catalyst resulted in the lowest ignition temperature, T 10, of 197 °C, while the minimum light-off temperature was obtained from both 0.2Ag/Co0.93Ce0.07 and 0.3Ag/Co0.93Ce0.07 in the NO x atmosphere. These materials were also characterized by various techniques, including H2, soot and NO x temperature programmed reduction, X-ray diffraction, and electron paramagnetic resonance, Raman, X-ray photoelectron, and Fourier transform infrared spectroscopic analyses. The results demonstrated that silver significantly alters the catalytic behavior under both O2 and NO x , even though the lattice structure of the mixed oxide is not affected. Surface silver oxides generated under the O2 atmosphere favor soot combustion by participating in the redox cycles between soot and the silver oxide, whereas the AgNO3 that forms in a NO x -rich atmosphere facilitates soot abatement at a lower temperature. The inferior activity of AgNO3 relative to that of Ag2O results in the different catalytic performance in the presence of NO x or O2.
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      PubDate: 2017-04-10T02:08:53Z
       
  • SAPO-34 synthesized with n-butylamine as a template and its catalytic
           application in the methanol amination reaction
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Yuyan Qiao, Pengfei Wu, Xiao Xiang, Miao Yang, Quanyi Wang, Peng Tian, Zhongmin Liu
      SAPO-34 was synthesized with n-butylamine (BA) as a template for the first time. Crystallization temperature and initial Si amount were important factors leading to successful syntheses. Lamellar AlPO-kanemite tends to form as the major phase or as an impurity of SAPO-34 at lower crystallization temperatures, though a higher initial Si amount may offer a positive effect on the crystallization of SAPO-34 that mitigates the low temperature. Higher temperature (240 °C) can effectively suppress the generation of lamellar materials and allow the synthesis of pure SAPO-34 with a wider range of Si incorporation. The crystallization processes at 200 and 240 °C were investigated and compared. We used the aminothermal method to synthesize SAPO-34-BA at 240 °C and also found n-propylamine is a suitable template for the synthesis of SAPO-34. The SAPO-34-BA products were characterized by many techniques. SAPO-34-BA has good thermal stability, crystallinity and porosity. BA remained intact in the crystals with ∼1.8 BA molecule per chabazite cage. The catalytic performance of SAPO-34 was tested in the methanol amination reaction, which showed high methanol conversion and selectivity for methylamine plus dimethylamine under the conditions investigated, suggesting that this material is a good candidate for the synthesis of methylamines.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Environmentally benign and economic synthesis of covalent triazine-based
           frameworks
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Ling Zhang, Xue Liu, Rui-Xia Yang, Nian-Yu Huang, Wei-Qiao Deng
      Covalent triazine-based frameworks (CTFs) are important microporous materials with a wide range of applications. Here, we demonstrate an environmentally benign and economic synthetic pathway to CTFs. The monomers used for CTFs, aromatic nitriles, were obtained by cyanation using nontoxic potassium hexacyanoferrate(II) in place of commonly used toxic cyanides. Then, the CTFs were synthesized by trimerization of the corresponding cyano monomers in molten zinc chloride. A series of CTFs was synthesized, and the highest Brunauer-Emmett-Teller surface area measured in this series was 2404 m2/g. Among the synthesized CTFs, CTFDCP exhibited excellent CO2 adsorption properties, with a CO2 uptake of 225 mg/g at 0 °C.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Palladium nanoparticles in cross-linked polyaniline as highly efficient
           catalysts for Suzuki-Miyaura reactions
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Haipeng Fan, Zhengliang Qi, Dejun Sui, Fei Mao, Rizhi Chen, Jun Huang
      Palladium nanoparticles supported on cross-linked polyaniline with bulky phosphorus ligands were developed. These catalysts showed high efficiency in the Suzuki-Miyaura reaction of aryl chlorides and bromides with phenylboronic acids. Aryl chlorides and bromides with functional groups, such as CN, MeO, CHO, MeCO and NO2, were converted to the corresponding biphenyls in high yields with catalyst loading. Additionally, the catalysts combined high activity with good reusability; they could be used at least five times for the Suzuki-Miyaura coupling reaction.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Surfactant-assisted hydrothermally synthesized MoS2 samples with
           controllable morphologies and structures for anthracene hydrogenation
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Min Li, Donge Wang, Jiahe Li, Zhendong Pan, Huaijun Ma, Yuxia Jiang, Zhijian Tian, Anhui Lu
      MoS2 samples with controllable morphologies and structures were synthesized using surfactant-assisted hydrothermal processes. The effects of surfactants (PEG, PVP, P123, SDS, AOT, and CTAB) on the morphologies and structures of MoS2 samples were investigated. The results revealed that spherical, bulk-like, and flower-like MoS2 particles assembled by NH4 +-intercalated MoS2 nano-sheets were synthesized. The morphologies of the MoS2 samples and their structures (including the slab length and the number of stacked layers) of MoS2 nano-sheets in these samples could be controlled by adjusting the surfactants. Mono-dispersed spherical MoS2 particles could be synthesized with PEG via the creation of MoS2 nano-sheets with slab lengths shorter than 15 nm and fewer than six stacked layers. Possible formation mechanisms of these MoS2 samples created via surfactant-assisted hydrothermal processes are proposed. Further, the catalytic activities of MoS2 samples for anthracene hydrogenation were evaluated in a slurry-bed reactor. The catalyst synthesized with the surfactant PEG exhibited the highest catalytic hydrogenation activity. Compared with the other catalysts, it had a smaller particle size, mono-dispersed spherical morphology, shorter slab length, and fewer stacked layers; these were all beneficial to exposing its active edges. This work provides an efficient approach to synthesize transition metal sulfides with controllable morphologies and structures.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Propene and CO oxidation on Pt/Ce-Zr-SO42– diesel oxidation catalysts:
           Effect of sulfate on activity and stability
    • Abstract: Publication date: March 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 3
      Author(s): Lei Gu, Xiao Chen, Ying Zhou, Qiulian Zhu, Haifeng Huang, Hanfeng Lu
      Platinum/cerium-zirconium-sulfate (Pt/Ce-Zr-SO4 2–) catalysts were prepared by wetness impregnation. Catalytic activities were evaluated from the combustion of propene and CO. Sulfate (SO4 2–) addition improved the catalytic activity significantly. When using Pt/Ce-Zr-SO4 2– with 10 wt% SO4 2–, the temperature for 90% conversion of propene and CO decreased by 75 °C compared with Pt/Ce-Zr. The conversion exceeded 95% at 240 °C even after 0.02% sulfur dioxide poisoning for 20 h. Temperature-programmed desorption of CO and X-ray photoelectron spectroscopy analyses revealed an improvement in Pt dispersion onto the Ce-Zr-SO4 2– support, and the increased number of Pt particles built up more Pt&+-(SO4 2–)&– couples, which resulted in excellent activity. The increased total acidity and new Brönsted acid sites on the surface provided the Pt/Ce-Zr-SO4 2– with good sulfur resistance.
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      PubDate: 2017-04-10T02:08:53Z
       
  • Preface to Special Issue on the International Symposium on Environmental
           Catalysis (ISEC 2016)
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Jinlin Li, Jiaguo Yu


      PubDate: 2017-03-13T00:21:57Z
       
  • Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction
           Ag/Ag2O-BiVO4
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Chunhong Wu, Yanfen Fang, Araya Hailu Tirusew, Miaomiao Xiang, Yingping Huang, Chuncheng Chen
      Microcystin-RR (MC-RR), a form of microcystin with two arginine moieties, is a cyanobacterial toxin that has been detected across a wide geographic range. It is a great concern globally because of its potential liver toxicity. Herein, the abilities of BiVO4, Ag-BiVO4, Ag2O-BiVO4 and Ag/Ag2O-BiVO4 to photocatalytically degrade MC-RR under visible-light irradiation (λ ≥ 420 nm) were investigated and compared. The possible degradation pathways were explored through analysis of the reaction intermediates by high-performance liquid chromatography-mass spectrometry. The results showed that the presence of Ag0 enhanced the photocatalytic efficiency of Ag/Ag2O-BiVO4 via a synergetic effect between Ag2O and Ag0 at the p-n heterojunction. Moreover, the presence of Ag0 also greatly promoted the adsorption of MC-RR on the photocatalyst surface. Toxicological experiments on mice showed that the toxicity of MC-RR was significantly reduced after photocatalytic degradation.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Effects of hierarchical structure on the performance of tin
           oxide-supported platinum catalyst for room-temperature formaldehyde
           oxidation
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Yuanyuan Duan, Shaoqing Song, Bei Cheng, Jiaguo Yu, Chuanjia Jiang
      Flower-like tin oxide-supported platinum (Pt/SnO x ) with a hierarchical structure was synthesized by a hydrothermal method and characterized by XRD, SEM, TEM, high resolution TEM, XPS and nitrogen adsorption. The flower-like Pt/SnO x microspheres of 1 μm in diameter were composed of staggered petal-like nanosheets with a thickness of 20 nm. Pt nanoparticles (NPs) of 2–3 nm were well dispersed on the SnO x nanosheets. The catalyst was tested in the catalytic oxidation of gaseous formaldehyde (HCHO) at room temperature, and exhibited enhanced activity compared to Pt NPs supported on commercial SnO and ground SnO x . HCHO removal of 87% was achieved over the hierarchical Pt/SnO x after 1 h of reaction, which was 1.5 times that over the ground SnO x -supported Pt (Pt/g-SnO x ), and the high activity was maintained after six recycles, showing the high stability of this catalyst. HCHO decomposition kinetics was modeled as a second order reaction. The reaction rate constant for Pt/SnO x was 5.6 times higher than Pt/g-SnO x . The hierarchical pore structure was beneficial for the diffusion and adsorption of HCHO molecules, and the highly dispersed Pt NPs on the SnO x nanosheets were the active sites for the oxidative decomposition of HCHO into CO2 and H2O. This study provided a promising approach for designing efficient catalysts for indoor HCHO removal at ambient temperature.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Catalytic performance of cobalt oxide-supported gold-palladium
           nanocatalysts for the removal of toluene and o-xylene
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Zhiwei Wang, Yuxi Liu, Tao Yang, Jiguang Deng, Shaohua Xie, Hongxing Dai
      Using the molten salt and polyvinyl alcohol-protected reduction method, we fabricated Co3O4 octahedron-supported Au-Pd (x(AuPd y )/Co3O4; x = (0.18, 0.47, and 0.96) wt%; y (Pd/Au molar ratio) = 1.85−1.97) nanocatalysts. The molten salt-derived Co3O4 sample possessed well-defined octahedral morphology, with an edge length of 300 nm. The Au-Pd nanoparticles, with sizes of 2.7−3.2 nm, were uniformly dispersed on the surface of Co3O4. The 0.96 (AuPd1.92)/Co3O4 sample showed the highest catalytic activity for toluene and o-xylene oxidation, and the temperature required for achieving 90% conversion of toluene and o-xylene was 180 and 187 °C, respectively, at a space velocity of 40000 mL/(g–h). The high catalytic performance of Co3O4 octahedron-supported Au-Pd nanocatalysts was associated with the interaction between Au-Pd nanoparticles and Co3O4 and high concentration of adsorbed oxygen species.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Heterostructured BiOI@La(OH)3 nanorods with enhanced visible light
           photocatalytic NO removal
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Yanjuan Sun, Xiang Xiao, Xing'an Dong, Fan Dong, Wei Zhang
      Heterostructured BiOI@La(OH)3 nanorod photocatalysts were prepared by a facile chemical impregnation method. The enhanced visible light absorption and charge carrier separation can be simultaneously realized after the introduction of BiOI particles into La(OH)3 nanorods. The BiOI@La(OH)3 composites were applied for visible light photocatalytic oxidization of NO in air and exhibited an enhanced activity compared with BiOI and pure La(OH)3 nanorods. The results show that the energy levels between the La(OH)3 and BiOI phases matched well with each other, thus forming a heterojunctioned BiOI@La(OH)3 structure. This band structure matching could promote the separation and transfer of photoinduced electron-hole pairs at the interface, resulting in enhanced photocatalytic performance under visible light irradiation. The photocatalytic performance of BiOI@La(OH)3 is shown to be dependent on the mass ratio of BiOI to La(OH)3. The highest photocatalytic performance can be achieved when the mass ratio of BiOI to La(OH)3 is controlled at 1.5. A further increase of the mass ratio of BiOI weakened the redox abilities of the photogenerated charge carriers. A new photocatalytic mechanism for BiOI@La(OH)3 heterostructures is proposed, which is directly related to the efficient separation of photogenerated charge carriers by the heterojunction. Importantly, the as-prepared BiOI@La(OH)3 heterostructures exhibited a high photochemical stability after multiple reaction runs. Our findings demonstrate that BiOI is an effective component for the formation of a heterostructure with the properties of a wide bandgap semiconductor, which is of great importance for extending the light absorption and photocatalytic activity of wide bandgap semiconductors into visible light region.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Heterogeneous catalytic activation of peroxymonosulfate for efficient
           degradation of organic pollutants by magnetic Cu0/Fe3O4 submicron
           composites
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Gang Nie, Jia Huang, Yezhou Hu, Yaobin Ding, Xiaoyan Han, Heqing Tang
      Magnetic Cu0/Fe3O4 submicron composites were prepared using a hydrothermal method and used as heterogeneous catalysts for the activation of peroxymonosulfate (PMS) and the degradation of organic pollutants. The as-prepared magnetic Cu0/Fe3O4 submicron composites were composed of Cu0 and Fe3O4 crystals and had an average size of approximately 220 nm. The Cu0/Fe3O4 composites could efficiently catalyze the activation of PMS to generate singlet oxygen, and thus induced the rapid degradation of rhodamine B, methylene blue, orange II, phenol and 4-chlorophenol. The use of 0.1 g/L of the Cu0/Fe3O4 composites induced the complete removal of rhodamine B (20 μmol/L) in 15 min, methylene blue (20 μmol/L) in 5 min, orange II (20 μmol/L) in 10 min, phenol (0.1 mmol/L) in 30 min and 4-chlorophenol (0.1 mmol/L) in 15 min with an initial pH value of 7.0 and a PMS concentration of 0.5 mmol/L. The total organic carbon (TOC) removal higher than 85% for all of these five pollutants was obtained in 30 min when the PMS concentration was 2.5 mmol/L. The rate of degradation was considerably higher than that obtained with Cu0 or Fe3O4 particles alone. The enhanced catalytic activity of the Cu0/Fe3O4 composites in the activation of PMS was attributed to the synergistic effect of the Cu0 and Fe3O4 crystals in the composites. Singlet oxygen was identified as the primary reactive oxygen species responsible for pollutant degradation by electron spin resonance and radical quenching experiments. A possible mechanism for the activation of PMS by Cu0/Fe3O4 composites is proposed as electron transfer from the organic pollutants to PMS induces the activation of PMS to generate 1O2, which induces the degradation of the organic pollutants. As a magnetic catalyst, the Cu0/Fe3O4 composites were easily recovered by magnetic separation, and exhibited excellent stability over five successive degradation cycles. The present study provides a facile and green heterogeneous catalysis method for the oxidative removal of organic pollutants.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Enhanced visible light photocatalytic H2 production over Z-scheme g-C3N4
           nansheets/WO3 nanorods nanocomposites loaded with Ni(OH)x cocatalysts
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Kelin He, Jun Xie, Xingyi Luo, Jiuqing Wen, Song Ma, Xin Li, Yueping Fang, Xiangchao Zhang
      Novel WO3/g-C3N4/Ni(OH) x hybrids have been successfully synthesized by a two-step strategy of high temperature calcination and in situ photodeposition. Their photocatalytic performance was investigated using TEOA as a hole scavenger under visible light irradiation. The loading of WO3 and Ni(OH) x cocatalysts boosted the photocatalytic H2 evolution efficiency of g-C3N4. WO3/g-C3N4/Ni(OH) x with 20 wt%defective WO3 and 4.8 wt%Ni(OH) x showed the highest hydrogen production rate of 576 μmol/(g–h), which was 5.7, 10.8 and 230 times higher than those of g-C3N4/4.8 wt%Ni(OH) x , 20 wt%WO3/C3N4 and g-C3N4 photocatalysts, respectively. The remarkably enhanced H2 evolution performance was ascribed to the combination effects of the Z-scheme heterojunction (WO3/g-C3N4) and loaded cocatalysts (Ni(OH) x ), which effectively inhibited the recombination of the photoexcited electron-hole pairs of g-C3N4 and improved both H2 evolution and TEOA oxidation kinetics. The electron spin resonance spectra of •O2 − and •OH radicals provided evidence for the Z-scheme charge separation mechanism. The loading of easily available Ni(OH) x cocatalysts on the Z-scheme WO3/g-C3N4 nanocomposites provided insights into constructing a robust multiple-heterojunction material for photocatalytic applications.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Highly efficient Z-scheme WO3–x quantum dots/TiO2 for photocatalytic
           hydrogen generation
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Lun Pan, Jingwen Zhang, Xu Jia, Yu-Hang Ma, Xiangwen Zhang, Li Wang, Ji-Jun Zou
      Z-scheme semiconductors are a promising class of photocatalysts for hydrogen generation. In this work, Z-scheme semiconductors composed of WO3–x quantum dots supported on TiO2 (WO3–x QDs/TiO2) were fabricated by solvothermal and hydrogen-reduction methods. Characterization by transmission electron microscopy and X-ray diffraction indicated that the amount and size of the WO3–x QDs could be tuned by modulating the addition of the W precursor. Evidence from X-ray photoelectron spectroscopy and photoluminescence spectroscopy suggested that the hydrogen reduction of the composite induced the formation of oxygen vacancy (W5+/VO) defects in WO3. These defects led to ohmic contact between WO3-x and TiO2, which altered the charge-transfer pathway from type II heterojunction to Z-scheme, and maintained the highly reductive and oxidative ability of TiO2 and WO3–x , respectively. Therefore, the Z-scheme sample showed 1.3-fold higher photoactivity than pure TiO2 in hydrogen generation. These results suggest that the formation of W5+/VO defects at the interface is highly beneficial for the fabrication of Z-scheme photocatalysts.
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      PubDate: 2017-03-13T00:21:57Z
       
  • Surface plasmon resonance-induced visible-light photocatalytic performance
           of silver/silver molybdate composites
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Xianglong Yang, Ying Wang, Xiao Xu, Yang Qu, Xing Ding, Hao Chen
      Novel silver/silver molybdate (Ag/Ag2MoO4) composites with surface plasmon resonance (SPR)-enhanced photocatalytic performance were successfully fabricated via a facile one-pot hydrothermal route with the presence of sodium dodecyl sulfate (SDS) in this study. The as prepared silver/silver molybdate (Ag/Ag2MoO4) composites were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflectance absorption spectroscopy (DRS) in order to investigate their crystal structure, morphology and optical property as well. The photocatalytic activities of the composites were subsequently evaluated by their ability to degrade rhodamine B (RhB) under visible-light irradiation. Varies of controlled experiments were then carefully operated to gain a deep insight into the assembling of Ag/Ag2MoO4 composites. It was found that preparation conditions such as pH, reaction time, and the amount of surfactant played important roles in the formation of composites with octahedral microstructures. And the composite obtained at 160 °C using 0.5 g of sodium dodecyl sulfate exhibited the highest photocatalytic performance under visible-light irradiation. Capture experiments were also conducted to clarify the function of different active species generated on the surface of Ag/Ag2MoO4 during the photocatalytic process, in which both holes and •OH radicals were found to play crucial role in photocatalytic removal of RhB under visible light irradiation. A possible photocatalytic mechanism of Ag/Ag2MoO4 was finally proposed on the basis of all the results to explain the higher photocatalytic activity of the octahedral Ag/Ag2MoO4 composites. It was inferred that the photoinduced “hot” electrons can quickly transfer from the Ag NPs to the conduction band of Ag2MoO4 and react with oxygen and H2O to generate a large quality of active radicals such as •OH and •O2 − because of the SPR effects. Besides, this SPR effects of Ag nanoparticles deposited on the surface of Ag2MoO4 can not only dramatically amplify its light absorption, especially in the visible region, but also promote the separation of photoexcited electron-hole pairs and effectively decrease electron-hole recombination.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Heterojunction between anodic TiO2/g-C3N4 and cathodic WO3/W
           nano-catalysts for coupled pollutant removal in a self-biased system
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Tingting Yu, Lifen Liu, Fenglin Yang
      An anodic TiO2/g-C3N4 hetero-junction and cathodic WO3/W were used to build a self-sustained catalytic fuel cell system for oxidizing rhodamine B or triclosan and reducing NO3 −-N to N2 simultaneously. The WO3 nano-catalyst was formed in situ by heating and oxidizing a tungsten wire in air. Cyclic voltammetry and current-time curves were used to characterize the electrochemical properties of the electrodes and system. Aeration and activation of molecular oxygen by self-biased TiO2/g-C3N4 led to the formation of reactive oxidizing species in the fuel cell. The mechanism of simultaneous anodic oxidation of pollutants and cathodic reduction of nitrate was proposed. The spontaneously formed circuit and tiny current were used simultaneously in treating two kinds of wastewater in the reactor chambers, even without light illumination or an external applied voltage. This new catalytic pollution control route can lower energy consumption and degrade many other kinds of pollutants.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Enhanced photochemical oxidation ability of carbon nitride by π–π
           stacking interactions with graphene
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Qiang Hao, Simeng Hao, Xiuxiu Niu, Xun Li, Daimei Chen, Hao Ding
      A one-pot method for the preparation of g-C3N4/reduced graphene oxide (rGO) composite photocatalysts with controllable band structures is presented. The photocatalysts are characterized by Fouirer transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, transmission electron microscope, and Mott-Schottky analysis. The valance band (VB) of g-C3N4 exhibits a noticeable positive shift upon hybridizing with rGO, and thus results in a strong photo-oxidation ability. The g-C3N4/rGO composites show a higher photodegradation activity for 2,4-dichlorophenol (2,4-DCP) and rhodamine B (RhB) under visible light irradiation (λ ≥ 420 nm). The g-C3N4/rGO-1 sample exhibits the highest photocatalytic activity, which is 1.49 and 1.52 times higher than that of bulk g-C3N4 for 2,4-DCP and 1.52 times degradation, respectively. The enhanced photocatalytic activity for g-C3N4 originates from the improved visible light usage, enhanced electronic conductivity and photo-oxidation ability by the formed strong π–π stacking interactions with rGO.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Preparation and application of g-C3N4-ZnS-DNA nanocomposite with enhanced
           electrocatalytic activity
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Xin Zhou, Jing Zou, Sheng Zhang, Ming Pan, Wanyun Gong
      We successfully designed and prepared a g-C3N4-ZnS-DNA nanocomposite by a simple method and systematically investigated its morphology, microstructure, and electrocatalytic properties. The as-prepared g-C3N4-ZnS-DNA nanocomposite possessed the electrocatalytic activity of g-C3N4-ZnS and the conductivity of DNA. The presence of DNA was found to enhance the electrocatalytic response of the nanocomposite towards environmental hormones, e.g. pentachlorophenol and nonylphenol, owing to the interaction between g-C3N4-ZnS and DNA, indicating that a stable nanocomposite was formed. The three components showed synergistic effects during electrocatalysis. Electrochemical impedance spectra indicated that the g-C3N4-ZnS-DNA nanocomposite dramatically facilitated the electron transfer of a modified electrode. The co-doping of g-C3N4 film with ZnS and DNA doubled the electrochemical response of the modified electrode in comparison with that of unmodified g-C3N4 film. The detection limits (3 S/N) of pentachlorophenol and nonylphenol were 3.3 × 10−9 mol L−1. Meanwhile, we propose a possible Z-scheme mechanism for electron transfer in the g-C3N4-ZnS-DNA nanocomposite and the possible pentachlorophenol and nonylphenol electrocatalytic oxidation mechanism. The g-C3N4-ZnS-DNA nanocomposite-modified electrode was demonstrated to be effective for electrochemical sensing of trace environmental hormones in water samples.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Facile synthesis and enhanced photocatalytic H2-evolution performance of
           NiS2-modified g-C3N4 photocatalysts
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Feng Chen, Hui Yang, Xuefei Wang, Huogen Yu
      NiS2 is a promising cocatalyst to improve the photocatalytic performance of g-C3N4 for the production of H2. However, the synthesis of the NiS2 cocatalyst usually requires harsh conditions, which risks destroying the microstructures of the g-C3N4 photocatalysts. In this study, a facile and low-temperature (80 °C) impregnation method was developed to prepare NiS2/g-C3N4 photocatalysts. First, the g-C3N4 powders were processed by the hydrothermal method in order to introduce oxygen-containing functional groups (such as –OH and –CONH–) to the surface of g-C3N4. Then, the Ni2+ ions could be adsorbed near the g-C3N4 via strong electrostatic interaction between g-C3N4 and Ni2+ ions upon the addition of Ni(NO3)2 solution. Finally, NiS2 nanoparticles were formed on the surface of g-C3N4 upon the addition of TAA. It was found that the NiS2 nanoparticles were solidly and homogeneously grafted on the surface of g-C3N4, resulting in greatly improved photocatalytic H2 production. When the amount of NiS2 was 3 wt%, the resultant NiS2/g-C3N4 photocatalyst showed the highest H2 evolution rate (116.343 μmol h−1 g−1), which is significantly higher than that of the pure g-C3N4 (3 μmol h−1 g−1). Moreover, the results of a recycling test for the NiS2/g-C3N4(3 wt%) sample showed that this sample could maintain a stable and effective photocatalytic H2-evolution performance under visible-light irradiation. Based on the above results, a possible mechanism of the improved photocatalytic performance was proposed for the presented NiS2/g-C3N4 photocatalysts, in which the photogenerated electrons of g-C3N4 can be rapidly transferred to the NiS2 nanoparticles via the close and continuous contact between them; then, the photogenerated electrons rapidly react with H2O adsorbed on the surface of NiS2, which has a surficial metallic character and high catalytic activity, to produce H2. Considering the mild and facile synthesis method, the presented low-cost and highly efficient NiS2-modified g-C3N4 photocatalysts would have great potential for practical use in photocatalytic H2 production.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Enhanced ethanol electro-oxidation on CeO2-modified Pt/Ni catalysts in
           alkaline solution
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Zhihua Xu, Lixia Rao, Haiyan Song, Zhaoxiong Yan, Lijun Zhang, Shuibin Yang
      Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2, and spontaneous Ni partial replacement by Pt processes. The as-prepared CeO2-modified Pt/Ni catalysts showed enhanced catalytic performance for ethanol electro-oxidation compared with pure Pt/Ni, and acetate species were proposed to be the main products of the oxidation when using these catalysts. The content of CeO2 in the as-prepared catalysts influenced their catalytic activity, with Pt/NiCe2 (obtained from an electrolyte containing 100 mg/L CeO2 nanoparticles) exhibiting higher activity and relatively better stability in ethanol electro-oxidation. This was mainly due to the oxygen storage capacity of CeO2, the interaction between Pt and CeO2/Ni, and the relatively small contact and charge transfer resistances. The results of this work thus suggest that electrocatalysts with low price and high activity can be rationally designed and produced by a simple route for use in direct ethanol fuel cells.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Three-dimensional MoS2/reduced graphene oxide aerogel as a macroscopic
           visible-light photocatalyst
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Ruiyang Zhang, Wenchao Wan, Dawei Li, Fan Dong, Ying Zhou
      Photocatalysis is regarded as an ideal technology for solving the urgent environmental and energy issues that we face today. Among the reported photocatalysts, molybdenum disulfide (MoS2) is very promising for applications in hydrogen production and pollutant photodegradation. However, its lack of active sites and the difficulty of recovering catalysts in powder form have hindered its wide application. Here, we report the successful preparation of a macroscopic visible-light responsive MoS2/reduced graphene oxide (MoS2/RGO) aerogel. The obtained MoS2/RGO aerogel exhibits enhanced photocatalytic activity towards hydrogen production and photoreduction of Cr(VI) in comparison with the MoS2 powder. In addition, the low density (56.1 mg/cm3) of the MoS2/RGO aerogel enables it to be used as an efficient adsorption material for organic pollutants. Our results demonstrate that this very promising multifunctional aerogel has potential applications in environmental remediation and clean energy production.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Enhanced visible-light photo-oxidation of nitric oxide using
           bismuth-coupled graphitic carbon nitride composite heterostructures
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Yuhan Li, Kangle Lv, Wingkei Ho, Zaiwang Zhao, Yu Huang
      Pure bismuth (Bi) metal-modified graphitic carbon nitride (g-C3N4) composites (Bi-CN) with a pomegranate-like structure were prepared by an in situ method. The Bi-CN composites were used as photocatalysts for the oxidation of nitric oxide (NO) under visible-light irradiation. The inclusion of pure Bi metal in the g-C3N4 layers markedly improved the light absorption of the Bi-CN composites from the ultraviolet to the near-infrared region because of the typical surface plasmon resonance of Bi metal. The separation and transfer of photogenerated charge carriers were greatly accelerated by the presence of built-in Mott–Schottky effects at the interface between Bi metal and g-C3N4. As a result, the Bi-CN composite photocatalysts exhibited considerably enhanced efficiency in the photocatalytic removal of NO compared with that of Bi metal or g-C3N4 alone. The pomegranate-like structure of the Bi-CN composites and an explanation for their improved photocatalytic activity were proposed. This work not only provides a design for highly efficient g-C3N4-based photocatalysts through modification with Bi metal, but also offers new insights into the mechanistic understanding of g-C3N4-based photocatalysis.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Effect of carrier and axial ligand on the photocatalytic activity of
           cobalt thioporphyrazine
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Yi Liu, Xuanmu Zhou, Zhehui Zhang, Bingguang Zhang, Kejian Deng
      The photocatalytic activity of cobalt octakis(butylthio) porphyrazine (CoPz(BuS)8) was assessed through photodegradation of the dye rhodamine B (RhB) in water under irradiation with a Xe lamp and aerated conditions. The photocatalytic activity of CoPz(BuS)8 loaded on Al2O3 or SiO2@Fe3O4 nanoparticles or coordinated with an axial azide ligand was also investigated. The results demonstrated that the photocatalytic activity of CoPz(BuS)8 loaded on Al2O3 was higher than that loaded on SiO2@Fe3O4. The kinetic curves of RhB degradation in aqueous solutions at different pH indicated the pseudo first-order kinetics of the reaction. The highest degradation rate for CoPz(BuS)8 loaded Al2O3 at pH = 4 after 160 min was 84.6%. However, the advantages of easier separation and recycling as well as the ability to terminate the reaction at any time for the CoPz(BuS)8 loaded SiO2@Fe3O4 cannot be ignored. When electron-rich NaN3 was coordinated with CoPz(BuS)8 as an axial ligand and loaded on Al2O3, the resulting catalyst produced more active oxygen species such as O2 − and HO• to promote the quicker degradation of RhB than that by the other catalysts. For the N3-coordinated CoPz(BuS)8 loaded on Al2O3, the reactions at pH = 4 and 7 distinctly deviated from first-order kinetics, and the degradation rate reached 77.6% after 80 min at pH = 4.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Construction of Ag3PO4/Ag2MoO4 Z-scheme heterogeneous photocatalyst for
           the remediation of organic pollutants
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Hua Tang, Yanhui Fu, Shufang Chang, Siyu Xie, Guogang Tang
      Hole/electron separation and charge transfer are the key processes for enhancing the visible-light photocatalysis performance of heterogeneous photocatalytic systems. To better utilize and understand these effects, binary Ag3PO4/Ag2MoO4 hybrid materials were fabricated by a facile solution-phase reaction and characterized systematically by X-ray diffraction (XRD), energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, field-emission scanning electron microscopy and ultraviolet-visible diffuse-reflectance spectroscopy. Under visible-light illumination, a heterogeneous Ag3PO4/Ag/Ag2MoO4 photocatalyst was constructed and demonstrated enhanced photocatalytic activity and photostability compared with pristine Ag3PO4 toward the remediation of the organic dye rhodamine B. The Ag3PO4/Ag2MoO4 hybrid catalyst with 8% mole fraction of Ag2MoO4 exhibited the highest photocatalytic activity toward the removal of typical dye molecules, including methyl orange, methylene blue and phenol aqueous solution. Moreover, the mechanism of the photocatalytic enhancement was investigated via hole- and radical-trapping experiments, photocurrent measurements, electrochemical impedance spectroscopy and XRD measurements. The XRD analysis revealed that metallic Ag nanoparticles formed initially on the surface of the Ag3PO4/Ag2MoO4 composites under visible-light illumination, leading to the generation of a Ag3PO4/Ag/Ag2MoO4 Z-scheme tandem photocatalytic system. The enhanced photocatalytic activity and stability were attributed to the formation of the Ag3PO4/Ag/Ag2MoO4 Z-scheme heterojunction and surface plasmon resonance of photo-reduced Ag nanoparticles on the surface. Finally, a plasmonic Z-scheme photocatalytic mechanism was proposed. This work may provide new insights into the design and preparation of advanced visible-light photocatalytic materials and facilitate their practical application in environmental issues.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Salt-assisted Synthesis of Hollow Bi2WO6 Microspheres with Superior
           Photocatalytic Activity for NO Removal
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Meijuan Chen, Yu Huang, Shun Cheng Lee
      Hollow Bi2WO6 microspheres are successfully synthesized by a facile ultrasonic spray pyrolysis (USP) method using NaCl as a salt template. The as-prepared hollow microspheres assembled as nanoplates with dimensions of approximately 41–148 nm and are dispersed with non-uniform pores on the template surface. By swapping the salt template with KCl or Na2SO4, different morphologies of Bi2WO6 are obtained. The experimental results demonstrate that NaCl plays a key role on the formation of Bi2WO6 with hollow structures. The specific growth mechanism of hollow microspheres was studied in detail. The Bi2WO6 hollow microspheres exhibit an excellent photocatalytic efficiency for NO removal under solar light irradiation, which is 1.73 times higher than for the Bi2WO6 obtained in the absence of any salt template. This enhancement can be ascribed to the simultaneous improvement on the surface area and visible light-harvesting ability from the hollow structures. Electron spin resonance (ESR) results suggest that both radicals of •OH and •O2 − are involved in the photocatalytic process over the BWO-NaCl sample. The production of •O2 − radicals offers better durability for NO removal.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Enhanced photocatalytic performance of cementitious material with TiO2@Ag
           modified fly ash micro-aggregates
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Lu Yang, Yining Gao, Fazhou Wang, Peng Liu, Shuguang Hu
      A TiO2 photocatalyst is coated on the surface of a zeolite fly ash bead (ZFAB) to improve its dispersability and exposure degree in a cement system. The application of Ag particles in TiO2/ZFAB modified cementitious materials is to further enhance the photocatalytic performance. Various Ag@TiO2/ZFAB modified cementitious specimens with different Ag dosages are prepared and the characteristics and photocatalytic performance of the prepared samples are investigated. It is observed that the multi-level pore structure of ZFAB can improve the exposure degree of TiO2 in a cement system and is also useful to enhance the photocatalytic efficiency. With an increment of the amounts of Ag particles in the TiO2/ZFAB modified cementitious samples, the photocatalytic activities increased first and then decreased. The optimal Ag@TiO2/ZFAB modified cementitious sample reveals the maximum reaction rate constant for degrading benzene (9.91 × 10−3 min−1), which is approximately 3 and 10 times higher than those of TiO2/ZFAB and TiO2 modified samples, respectively. This suggests that suitable Ag particles coupled with a ZFAB carrier could effectively enhance the photocatalytic effects and use of TiO2 in a cement system. Thus, ZFAB as a carrier could provide a potential method for a high efficiency engineering application of TiO2 in the construction field.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Electrodeposition of Cu2O/g-C3N4 heterojunction film on an FTO substrate
           for enhancing visible light photoelectrochemical water splitting
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Shengsen Zhang, Jie Yan, Siyuan Yang, Yuehua Xu, Xin Cai, Xin Li, Xiangchao Zhang, Feng Peng, Yueping Fang
      An immobilized Cu2O/g-C3N4 heterojunction film was successfully made on an FTO substrate by electrophoretic deposition of g-C3N4 on a Cu2O thin film. The photoelectrochemical (PEC) performance for water splitting by the Cu2O/g-C3N4 film was better than pure g-C3N4 and pure Cu2O film. Under –0.4 V external bias and visible light irradiation, the photocurrent density and PEC hydrogen evolution efficiency of the optimized Cu2O/g-C3N4 film was –1.38 mA/cm2 and 0.48 mL h−1 cm−2, respectively. The enhanced PEC performance of Cu2O/g-C3N4 was attributed to the synergistic effect of light coupling and a matching energy band structure between g-C3N4 and Cu2O as well as the external bias.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Solvent-assisted synthesis of porous g-C3N4 with efficient visible-light
           photocatalytic performance for NO removal
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Wendong Zhang, Zaiwang Zhao, Fan Dong, Yuxin Zhang
      Graphitic carbon nitride (g-C3N4) with efficient photocatalytic activity was synthesized through thermal polymerization of thiourea with the addition of water (CN-W) or ethanol (CN-E) at 550 °C for 2 h. The physicochemical properties of the g-C3N4 were investigated by X-ray diffraction, transmission electron microscopy, ultraviolet-visible spectroscopy, photoluminescence spectroscopy, diffuse-reflection spectroscopy, BET and BJH surface area characterization, and elemental analysis. The carbon content was found to have self-doped into the g-C3N4 matrix during the thermal polymerization of thiourea and ethanol. CN-W and CN-E showed considerably enhanced visible-light photocatalytic activity, with NO removal percentages of 37.2% and 48.3%, respectively. Compared with pure g-C3N4, both the short and long lifetimes of the charge carriers in CN-W and CN-E were found to be prolonged. The mechanism of improved visible-light photocatalytic activity was deduced. The present work may provide a facile route to optimize the microstructure of g-C3N4 photocatalysts for high-performance environmental and energy applications.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Synthesis of C–Cl-codoped titania/attapulgite composites with enhanced
           visible-light photocatalytic activity
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Lijuan Deng, Yi Xie, Gaoke Zhang
      We demonstrate the synthesis of C–Cl-codoped titania/attapulgite (TiO2/ATT) composites containing a mixture of TiO2 phases by a facile sol-gel method at 70 °C using titanium tetraisopropoxide as the TiO2 precursor and ATT as a support for the TiO2 nanoparticles. The photocatalytic activity of the C–Cl-codoped TiO2/ATT composites with mixed anatase/brookite/rutile phases obtained at pH = 3.0 was much higher than that of commercially available Degussa P25 for the photocatalytic degradation of acid red G under visible-light irradiation. The excellent photocatalytic activity of the developed composite originates from the nonmetal codoping, which extends the absorption edge of TiO2 into visible region, and the presence of multiple phases, which slow the recombination of photoexcited electron/hole pairs. The formation of hydroxyl radicals during the photocatalytic degradation process was detected by photoluminescence probing using terephthalic acid. A mechanism for photocatalysis over the C–Cl-codoped TiO2/ATT composites was proposed.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Selective oxidative dehydrogenation of ethane to ethylene over a
           hydroxylated boron nitride catalyst
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Lei Shi, Bing Yan, Dan Shao, Fan Jiang, Dongqi Wang, An-Hui Lu
      Boron nitride containing hydroxyl groups efficiently catalysed oxidative dehydrogenation of ethane to ethylene, offering rather high selectivity (95%) but only small amount of CO2 formation (0.4%) at a given ethane conversion of 11%. Even at high conversion level of 63%, the selectivity of ethylene retained at 80%, which is competitive with the energy-demanding industrialized steam cracking route. A long-term test for 200 h resulted in stable conversion and product selectivity, showing the excellent catalytic stability. Both experimental and computational studies have identified that the hydrogen abstraction of B-OH groups by molecular oxygen dynamically generated the active sites and triggered ethane dehydrogenation.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • High activity of a Pt decorated Ni/C nanocatalyst for hydrogen oxidation
    • Abstract: Publication date: February 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 2
      Author(s): Xiaolin Gao, Yufei Wang, Heping Xie, Tao Liu, Wei Chu
      The Pt decorated Ni/C nanocatalysts were prepared for hydrogen oxidation reaction (HOR) in fuel cell. By regulating the contents of Pt and Ni in the catalyst, both the composition and the structure affected the electrochemical catalytic characteristics of the Pt-Ni/C catalysts. When the Pt mass content was 3.1% percent and that of Ni was 13.9% percent, the Pt-Ni/C-3 catalyst exhibited a larger electrochemically active surface area and a higher exchange current density toward HOR than those of pure supported platinum sample. Our study demonstrates a feasible approach for designing the more efficient catalysts with lower content of noble metal for HOR in fuel cell.
      Graphical abstract image

      PubDate: 2017-03-13T00:21:57Z
       
  • Co2C nanoprisms for syngas conversion to lower olefins with high
           selectivity
    • Abstract: Publication date: January 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 1
      Author(s): Yunjie Ding
      Graphical abstract image

      PubDate: 2017-01-28T12:55:30Z
       
  • Latest progress in hydrogen production from solar water splitting via
           photocatalysis, photoelectrochemical, and
           photovoltaic-photoelectrochemical solutions
    • Abstract: Publication date: January 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 1
      Author(s): Rengui Li
      Hydrogen production via solar water splitting is regarded as one of the most promising ways to utilize solar energy and has attracted more and more attention. Great progress has been made on photocatalytic water splitting for hydrogen production in the past few years. This review summarizes the very recent progress (mainly in the last 2–3 years) on three major types of solar hydrogen production systems: particulate photocatalysis (PC) systems, photoelectrochemical (PEC) systems, and photovoltaic-photoelectrochemical (PV-PEC) hybrid systems. The solar-to-hydrogen (STH) conversion efficiency of PC systems has recently exceeded 1.0% using a SrTiO3:La,Rh/Au/BiVO4:Mo photocatalyst, 2.5% for PEC water splitting on a tantalum nitride photoanode, and reached 22.4% for PV-PEC water splitting using a multi-junction GaInP/GaAs/Ge cell and Ni electrode hybrid system. The advantages and disadvantages of these systems for hydrogen production via solar water splitting, especially for their potential demonstration and application in the future, are briefly described and discussed. Finally, the challenges and opportunities for solar water splitting solutions are also forecasted.
      Graphical abstract image

      PubDate: 2017-01-28T12:55:30Z
       
 
 
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