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COMPUTER SCIENCE (1196 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 20)
Abakós     Open Access   (Followers: 4)
ACM Computing Surveys     Hybrid Journal   (Followers: 22)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 8)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 11)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 5)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 12)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 14)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 5)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 3)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 7)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 7)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 8)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 27)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Advanced Engineering Materials     Hybrid Journal   (Followers: 28)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 7)
Advances in Artificial Intelligence     Open Access   (Followers: 15)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 18)
Advances in Computer Science : an International Journal     Open Access   (Followers: 15)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 51)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
Advances in Materials Sciences     Open Access   (Followers: 14)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 6)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 43)
Advances in Science and Research (ASR)     Open Access   (Followers: 4)
Advances in Technology Innovation     Open Access   (Followers: 5)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
AI EDAM     Hybrid Journal  
Air, Soil & Water Research     Open Access   (Followers: 11)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 5)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 5)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annual Reviews in Control     Hybrid Journal   (Followers: 6)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 1)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 13)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Computer Systems     Open Access   (Followers: 2)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 33)
Applied Medical Informatics     Open Access   (Followers: 10)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Applied System Innovation     Open Access  
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 130)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 7)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 7)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access   (Followers: 1)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 4)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 11)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Big Data and Cognitive Computing     Open Access   (Followers: 2)
Biodiversity Information Science and Standards     Open Access  
Bioinformatics     Hybrid Journal   (Followers: 282)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 43)
British Journal of Educational Technology     Hybrid Journal   (Followers: 142)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Capturing Intelligence     Full-text available via subscription  
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cell Communication and Signaling     Open Access   (Followers: 2)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 7)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 15)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 20)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 52)
Communications of the Association for Information Systems     Open Access   (Followers: 16)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 9)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 14)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 30)
Computer     Full-text available via subscription   (Followers: 94)
Computer Aided Surgery     Hybrid Journal   (Followers: 6)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Communications     Hybrid Journal   (Followers: 10)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 9)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 23)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 12)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 2)
Computer Music Journal     Hybrid Journal   (Followers: 19)

        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
   ISSN (Print) 1872-2067
   Published by Elsevier Homepage  [3175 journals]
  • Metal-organic frameworks for highly efficient oxygen electrocatalysis
    • Authors: Xiaobo He; Fengxiang Yin; Hao Wang; Biaohua Chen; Guoru Li
      Pages: 207 - 227
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Xiaobo He, Fengxiang Yin, Hao Wang, Biaohua Chen, Guoru Li
      Metal-organic frameworks (MOFs) are a series of highly porous crystalline materials, which are built from inorganic metal nodes and organic linkers through coordination bonds. Their unique porous structural features (such as high porosity, high surface areas, and highly ordered nanoporous structures) and designable structures and compositions have facilitated their use in gas capture, separation, catalysis, and energy storage and conversion. Recently, the design and synthesis of pure MOFs and their derivatives have opened new routes to develop highly efficient electrocatalysts toward oxygen reduction reactions (ORR) and oxygen evolution reactions (OER), which are the core electrode reactions in many energy storage and conversion techniques, such as metal-air batteries and fuel cells. This review first discusses recent progress in the synthesis and the electrocatalytic applications of pure MOF-based electrocatalysts toward ORR or OER, including pure MOFs, MOFs decorated with active species, and MOFs incorporated with conductive materials. The following section focuses on the advancements of the design and preparation of various MOF-derived materials—such as inorganic nano- (or micro-) structures/porous carbon composites, pure porous carbons, pure inorganic nano- (or micro-) structured materials, and single-atom electrocatalysts—and their applications in oxygen electrocatalysis. Finally, we present a conclusion and an outlook for some general design strategies and future research directions of MOF-based oxygen electrocatalysts.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63017-7
       
  • Mononuclear first-row transition-metal complexes as molecular catalysts
           for water oxidation
    • Authors: Ni Wang; Haoquan Zheng; Wei Zhang; Rui Cao
      Pages: 228 - 244
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Ni Wang, Haoquan Zheng, Wei Zhang, Rui Cao
      Water oxidation is significant in both natural and artificial photosynthesis. In nature, water oxidation occurs at the oxygen-evolving center of photosystem II, and leads to the generation of oxygen, protons, and electrons. The last two are used for fixation of carbon dioxide to give carbohydrates. In artificial processes, the coupling of water oxidation to evolve O2 and water reduction to evolve H2 is known as water splitting, which is an attractive method for solar energy conversion and storage. Because water oxidation is a thermodynamically uphill reaction and is kinetically slow, this reaction causes a bottleneck in large-scale water splitting. As a consequence, the development of new and efficient water oxidation catalysts (WOCs) has attracted extensive attention. Recent efforts have identified a variety of mononuclear earth-abundant transition-metal complexes as active and stable molecular WOCs. This review article summarizes recent progress in research on mononuclear catalysts that are based on first-row transition-metal elements, namely manganese, iron, cobalt, nickel, and copper. Particular attention is paid to catalytic mechanisms and the key O–O bond formation steps. This information is critical for designing new catalysts that are highly efficient and stable.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)63001-8
       
  • Chemical fixation of carbon dioxide to cyclic carbonates catalyzed by
           zinc(II) complex bearing 1,2-disubstituted benzimidazole ligand
    • Authors: Jorge L.S. Milani; Igor S. Oliveira; Pamella A. Dos Santos; Ana K.S.M. Valdo; Felipe T. Martins; Danielle Cangussu; Rafael P. Das Chagas
      Pages: 245 - 249
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Jorge L.S. Milani, Igor S. Oliveira, Pamella A. Dos Santos, Ana K.S.M. Valdo, Felipe T. Martins, Danielle Cangussu, Rafael P. Das Chagas
      A new zinc(II) complex of formula [ZnCl2(L1)2] (1) [L1 = 2-(2-thienyl)-1-(2-thienylmethyl)-1H- benzimidazole] was synthesized and fully characterized by nuclear magnetic resonance and infrared spectroscopy, elemental analysis, electrospray ionization high-resolution mass spectrometry, and thermogravimetric analysis. The molecular structure was confirmed by single-crystal X-ray diffraction. Complex 1 consists of mononuclear tetrahedral zinc(II) units with a locked geometry resulting from weak intramolecular S…π and π–π interligand interactions. The benzimidazole ligand and its zinc(II) complex were readily obtained through a simple synthetic route. The catalytic activity of 1 was investigated in the coupling of carbon dioxide with epoxides to produce cyclic carbonates, and a series of parameters were evaluated. The complex efficiently catalyzed the transformation of various epoxides under solvent-free conditions, with good conversions, turnover numbers, and turnover frequencies.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62992-9
       
  • Robust cobalt oxide catalysts for controllable hydrogenation of carboxylic
           acids to alcohols
    • Authors: Song Song; Dong Wang; Lu Di; Chuanming Wang; Weili Dai; Guangjun Wu; Naijia Guan; Landong Li
      Pages: 250 - 257
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Song Song, Dong Wang, Lu Di, Chuanming Wang, Weili Dai, Guangjun Wu, Naijia Guan, Landong Li
      The selective catalytic hydrogenation of carboxylic acids is an important process for alcohol production, while efficient heterogeneous catalyst systems are still being explored. Here, we report the selective hydrogenation of carboxylic acids using earth-abundant cobalt oxides through a reaction-controlled catalysis process. The further reaction of the alcohols is completely hindered by the presence of carboxylic acids in the reaction system. The partial reduction of cobalt oxides by hydrogen at designated temperatures can dramatically enhance the catalytic activity of pristine samples. A wide range of carboxylic acids with a variety of functional groups can be converted to the corresponding alcohols at a yield level applicable to large-scale production. Cobalt monoxide was established as the preferred active phase for the selective hydrogenation of carboxylic acids.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)63003-1
       
  • Effect of χ-alumina addition on H2S oxidation properties of pure and
           modified γ-alumina
    • Authors: Svetlana A. Yashnik; Vadim V. Kuznetsov; Zinfer R. Ismagilov
      Pages: 258 - 274
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Svetlana A. Yashnik, Vadim V. Kuznetsov, Zinfer R. Ismagilov
      The influence of the textural and acidic properties of γ-Al2O3, (γ+χ)-Al2O3, and α-Al2O3 on the catalytic activity, selectivity, and stability of direct H2S oxidation has been studied. A comparison of the H2S-to-S conversion effectiveness of aluminas with their acidic properties (identified by Fourier transform infrared spectroscopy and temperature programmed desorption of NH3) shows that H2S adsorption occurs predominantly on weak Lewis acid sites (LAS). γ-Alumina samples containing a χ-phase and/or modified Mg2+ ions have a greater concentration of weak LAS and exhibit greater catalytic activity. When alumina is treated with a sulfuric acid solution, strong LAS appear and the number of LAS decreases significantly. Modification of alumina with hydrochloric acid has a limited effect on LAS strength. Weak LAS are retained and double in number compared to that present in the unmodified alumina, but the treated sample has Al−Cl bonds. Alumina samples modified by sulfate and chloride anions exhibit poor catalytic activity in H2S oxidation.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63016-5
       
  • Hydrothermal synthesis and catalytic performance of bulky titanium
           silicalite-1 aggregates assembled by bridged organosilane
    • Authors: Li Chen; Teng Xue; Jian Ding; Hai Hong Wu; Kun Zhang; Peng Wu; Ming-Yuan He
      Pages: 275 - 282
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Li Chen, Teng Xue, Jian Ding, Hai Hong Wu, Kun Zhang, Peng Wu, Ming-Yuan He
      A facile and effective method to synthesize TS-1 zeolite aggregates has been presented. The crystallization of silanized seeds and nanocrystallites led to large and irregular TS-1 zeolite aggregates ranging from 5 to 40 μm in size, based on the special sol-gel chemistry of bridged organosilane. Epoxidation of 1-hexene and cyclohexene was used as a probe reaction to investigate the catalytic performance of the resulting materials. These TS-1 zeolite aggregates possessed both the conventional nanoparticle properties of TS-1 zeolites and variable surface hydrophilic/hydrophobic features, which enhanced the catalytic properties of hydroperoxides for alkene epoxidation. Moreover, the large aggregates effectively simplified the separation procedure during preparation and catalytic reactions.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63026-8
       
  • Encapsulation of a nickel Salen complex in nanozeolite LTA as a carbon
           paste electrode modifier for electrocatalytic oxidation of hydrazine
    • Authors: Seyed Karim Hassaninejad-Darzi
      Pages: 283 - 296
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Seyed Karim Hassaninejad-Darzi
      A nickel salen complex was encapsulated in the supercages of nanozeolite NaA, LTA (linde type A) structure, using the flexible ligand method. The electrochemical behavior and electrocatalytic activity of a carbon paste electrode (CPE) modified with Ni(II)-Salen-A (Ni(II)-SalenA/CPE) for hydrazine oxidation in 0.1 mol/L NaOH solution were investigated by cyclic voltammetry, chronoamperometry, and chronocoulometry. First, organic-template-free synthesis of nanozeolite LTA was performed and the obtained material was characterized by various techniques. The average particle size of the LTA crystals was estimated to be 56.1 and 72 nm by X-ray diffraction and particle size analysis, respectively. The electron transfer coefficient was found to be 0.64 and the catalytic rate constant for oxidation of hydrazine at the redox sites of Ni(II)-SalenA/CPE was found to be 1.03 × 105 cm3/(mol·s). Investigation of the electrocatalytic mechanism suggested that oxidation of hydrazine occurred through reaction with Ni3+(Salen)O(OH) and also direct electrooxidation. The anodic peak currents revealed a linear dependence on the square root of the scan rate, indicating a diffusion-controlled process, and the diffusion coefficient of hydrazine was found to be 1.18 × 10−7 cm2/s. The results indicated that Ni(II)-SalenA/CPE displays good electrocatalytic activity toward hydrazine oxidation owing to the porous structure of nanozeolite LTA and the Ni(II)-Salen complex. Finally, the general reaction mechanism for the electrooxidation of hydrazine on Ni(II)-SalenA/CPE in alkaline solution involves the transfer of four electrons, in which the first electron transfer reaction acts as the rate-limiting step followed by a three-electron process to generate environmentally friendly nitrogen and water as final products.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63025-6
       
  • ZrO2-modified Ni/LaAl11O18 catalyst for CO methanation: Effects of
           catalyst structure on catalytic performance
    • Authors: Hongmei Ai; Hongyuan Yang; Qing Liu; Guoming Zhao; Jing Yang; Fangna Gu
      Pages: 297 - 308
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Hongmei Ai, Hongyuan Yang, Qing Liu, Guoming Zhao, Jing Yang, Fangna Gu
      We report Ni/LaHA@ZrO2 catalysts prepared by a facile modified successive adsorption and reaction method for CO methanation. N2 adsorption, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, H2 temperature-programmed reduction, H2 temperature-programmed desorption, X-ray photoelectron spectroscopy, thermogravimetric analysis, and inductively coupled plasma atomic emission spectrometry were used to characterize the samples. The results indicated that the ZrO2 nanoparticles were distributed over the surface of the Ni/LaHA@ZrO2 catalyst and even partially covered some Ni particles, resulting in the coating exerting a confinement effect. The excess ZrO2 had an adverse effect on the enhancement of CO conversion because of the coverage of the surface Ni particles; however, the Ni/LaHA@ZrO2 catalyst displayed much higher CH4 selectivity than Ni/LaHA because of the activation of the byproduct CO2 molecules by ZrO2 species. Therefore, even though 20Ni/LaHA@ZrO2-5 exhibited similar CO conversion as 20Ni/LaHA, the use of the former resulted in a higher CH4 yield than the use of the latter. A 107-h-lifetime test revealed that the Ni/LaHA@ZrO2 catalyst was highly stable with superior anti-sintering and anti-coking properties because of its coating structure and the promoter effect of ZrO2.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62995-4
       
  • Oxidative coupling of alcohols and amines to an imine over Mg-Al acid-base
           bifunctional oxide catalysts
    • Authors: Jinling Song; Guiyang Yu; Xi Li; Xuwei Yang; Wenxiang Zhang; Wenfu Yan; Gang Liu
      Pages: 309 - 318
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Jinling Song, Guiyang Yu, Xi Li, Xuwei Yang, Wenxiang Zhang, Wenfu Yan, Gang Liu
      A series of Mg-Al mixed oxide catalysts are prepared and introduced as efficient irreducible catalysts for the oxidative coupling of alcohols and amines to imine. The structure and surface properties of Mg-Al oxides are modulated by changing the Mg/Al ratios, calcination temperature and treatment with probe molecules. Detailed characterization, including X-ray diffraction, 27Al magic angle spinning nuclear magnetic resonance spectroscopy, N2-adsorption, NH3-temperature-programmed desorption, CO2-temperature-programmed desorption and X-ray photoelectron spectroscopy are carried out to determine the physicochemical properties of these catalysts. The Mg-Al oxides with Mg/Al = 3 exhibit the highest activity in the reaction, which possess a large number of surface weak basic sites and a relatively small number of weak acidic sites. The role of the acidic and basic sites in the reaction process is systematically investigated, and are shown to serve as adsorption and activation sites for amines and alcohols, respectively. Under the synergistic effect of these acid-base centers, the oxidative coupling process successfully occurs on the surface of Mg-Al mixed oxides. Compared with the acidic sites, the weak basic sites play a more important role in the catalytic process. The acidic sites are the catalytic centers for the benzyl alcohol activation, which control the reaction rate of the oxidative coupling reaction.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)63006-7
       
  • Highly selective hydrogenation of furfural to tetrahydrofurfuryl alcohol
           over MIL-101(Cr)-NH2 supported Pd catalyst at low temperature
    • Authors: Dongdong Yin; Hangxing Ren; Chuang Li; Jinxuan Liu; Changhai Liang
      Pages: 319 - 326
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Dongdong Yin, Hangxing Ren, Chuang Li, Jinxuan Liu, Changhai Liang
      An efficient heterogeneous catalyst, Pd@MIL-101(Cr)-NH2, is prepared through a direct pathway of anionic exchange followed by hydrogen reduction with amino-containing MIL-101 as the host matrix. The composite is thermally stable up to 350 °C and the Pd nanoparticles uniformly disperse on the matal organic framework (MOF) support, which are attributed to the presence of the amino groups in the frameworks of MIL-101(Cr)-NH2. The selective hydrogenation of biomass-based furfural to tetrahydrofurfuryl alcohol is investigated by using this multifunctional catalyst Pd@MIL-101(Cr)-NH2 in water media. A complete hydrogenation of furfural is achieved at a low temperature of 40 °C with the selectivity of tetrahydrofurfuryl alcohol close to 100%. The amine-functionalized MOF improves the hydrogen bonding interactions between the intermediate furfuryl alcohol and the support, which is conducive for the further hydrogenation of furfuryl alcohol to tetrahydrofurfuryl alcohol in good coordination with the metal sites.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63009-8
       
  • Ruthenium(II) complex catalysts bearing a 2,6-bis(tetrazolyl)pyridine
           ligand for the transfer hydrogenation of ketones
    • Authors: Liandi Wang; Tingting Liu
      Pages: 327 - 333
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Liandi Wang, Tingting Liu
      Three ruthenium(II) complex catalysts bearing 2,6-bis(tetrazolyl)pyridine were synthesized, structurally characterized, and applied in the transfer hydrogenation of ketones. Their different catalytic activities were attributed to the different phosphine ligands on the 4-chloro-2,6-bis(1-(p-tolyl)- 1H- tetrazol-5-yl)pyridine ruthenium(II) complexes, with that based on 1,4- bis(diphenylphosphino)  butane exhibiting better catalytic activity. A variety of ketones were reduced to their corresponding alcohols with >95% conversion.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62994-2
       
  • Mesoporous polyoxometalate-based ionic hybrid as a highly effective
           heterogeneous catalyst for direct hydroxylation of benzene to phenol
    • Authors: Pingping Zhao; Yunyun Zhang; Daokuan Li; Hongyou Cui; Lipeng Zhang
      Pages: 334 - 341
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Pingping Zhao, Yunyun Zhang, Daokuan Li, Hongyou Cui, Lipeng Zhang
      Self-assembled mesoporous polyoxometalate-based ionic hybrid catalyst, [PxyDim]2.5PMoV2, was prepared by combining p-xylene-tethered diimidazole ionic liquid [PxyDim]Cl2 with Keggin-structured V-substituted polyoxometalate H5PMo10V2O40. The obtained hybrid was shown to be a mesostructured and hydrophobic material with good thermal stability. In the H2O2-based hydroxylation of benzene to phenol, the hybrid showed extraordinary catalytic activity and rate, and quite stable reusability. The unique hydrophobic properties and mesoporous structure of the hybrid were responsible for its excellent catalytic performance.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62991-7
       
  • Composition-controlled synthesis of platinum and palladium nanoalloys as
           highly active electrocatalysts for methanol oxidation
    • Authors: Haiqiang Zhao; Weihong Qi; Xinfeng Zhou; Haofei Wu; Yejun Li
      Pages: 342 - 349
      Abstract: Publication date: February 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 2
      Author(s): Haiqiang Zhao, Weihong Qi, Xinfeng Zhou, Haofei Wu, Yejun Li
      Platinum and palladium (PtPd) alloy nanoparticles (NPs) are excellent catalysts for direct methanol fuel cells. In this study, we developed PtPd alloy NPs through the co-reduction of K2PtCl4 and Na2PdCl4 in a polyol synthesis environment. During the reaction, the feed molar ratio of the two precursors was carried over to the final products, which have a narrow size distribution with a mean size of approximately 4 nm. The catalytic activity for methanol oxidation reactions possible depends closely on the composition of as-prepared PtPd alloy NPs, and the NPs with a Pt atomic percentage of approximately 75% result in higher activity and stability with a mass specific activity that is 7 times greater than that of commercial Pt/C catalysts. The results indicate that through composition control, PtPd alloy NPs can improve the effectiveness of catalytic performance.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63020-7
       
  • Pinpointing single metal atom anchoring sites in carbon for oxygen
           reduction: Doping sites or defects'
    • Authors: Cai Zhang; Wei Zhang; Weitao Zheng
      Pages: 4 - 7
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Cai Zhang, Wei Zhang, Weitao Zheng
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62944-9
       
  • Gold-loaded graphene oxide/PDPB composites for the synchronous removal of
           Cr(VI) and phenol
    • Authors: Jun Liu; Wenzhang Fang; Yuhang Wang; Mingyang Xing; Jinlong Zhang
      Pages: 8 - 15
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Jun Liu, Wenzhang Fang, Yuhang Wang, Mingyang Xing, Jinlong Zhang
      The construction of novel inorganic-organic hybrid nanomaterials for synchronous photocatalytic removal of heavy metal ions and organic pollutants has received significant attention. We successfully synthesized gold-loaded graphene oxide/PDPB (polymer poly(diphenylbutadiyne)) composites (Au-GO/PDPB) through a facile mechanical agitation and photoreduction method. The composites were characterized by XPS and TEM images, which confirmed the presence of GO and Au nanoparticles on the PDPB. The as-prepared Au-GO/PDPB composites displayed enhanced photocatalytic activity compared with that of pure PDPB for the synchronous photoreduction of hexavalent chromium (Cr(VI)) and photo-oxidation of phenol. We also determined the optimal loading mass of GO and Au nanoparticles on the PDPB; the Au1-GO2/PDPB (2.0 wt% GO and 1.0 wt% Au) composite displayed the best photocatalytic activity among all the catalysts. Our study provides a facile way to prepare inorganic-organic composites for the synchronous photocatalytic removal of heavy metal ions and organic pollutants.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62933-4
       
  • Availability of elements for heterogeneous catalysis: Predicting the
           industrial viability of novel catalysts
    • Authors: Anders B. Laursen; Jens Sehested; Ib Chorkendorff; Peter C.K. Vesborg
      Pages: 16 - 26
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Anders B. Laursen, Jens Sehested, Ib Chorkendorff, Peter C.K. Vesborg
      Growing concern regarding the sustainability of the chemical industry has driven the development of more efficient catalytic reactions. First-generation estimates of catalyst viability are based on crustal abundance, which has severe limitations. Herein, we propose a second-generation approach to predicting the viability of novel catalysts prior to industrial implementation to benefit the global chemical industry. Using this prediction, we found that a correlation exists between catalyst consumption and the annual production or price of the catalyst element for 11 representative industrial catalytic processes. Based on this correlation, we have introduced two new descriptors for catalyst viability, namely, catalyst consumption to availability ratio per annum (CCA) and consumed catalyst cost to product value ratio per annum (CCP). Based on evaluations of CCA and CCP for selected industrial reactions, we have grouped catalysts from the case studies according to viability, allowing the identification of general limits of viability based on CCA and CCP. Calculating the CCA and CCP and their comparing with the general limits of viability provides researchers with a novel framework for evaluating whether the cost or physical availability of a new catalyst could be limiting. We have extended this analysis to calculate the predicted limits of economically viable production and product cost for new catalysts.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62979-6
       
  • Ethyl and butyl acetate oxidation over manganese oxides
    • Authors: Olívia Salomé G.P. Soares; Raquel P. Rocha; José J.M. Órfão; Manuel F.R. Pereira; José L. Figueiredo
      Pages: 27 - 36
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Olívia Salomé G.P. Soares, Raquel P. Rocha, José J.M. Órfão, Manuel F.R. Pereira, José L. Figueiredo
      Mangenese oxides were synthesized using two new methods, a novel solvent-free reaction and a reflux technique, that produced cryptomelane-type products (K-OMS-2). Oxides were also synthesized using conventional methods and all specimens were applied to the oxidation of ethyl acetate and butyl acetate, acting as models for the volatile organic compounds found in industrial emissions. The catalysts were also characterized using N2 adsorption, X-ray diffraction, scanning electron microscopy, temperature programmed reduction and X-ray photoelectron spectroscopy. Each of the manganese oxides was found to be very active during the oxidation of both esters to CO2, and the synthesis methodology evidently had a significant impact on catalytic performance. The K-OMS-2 nanorods synthesized by the solvent-free method showed higher activity than K-OMS-2 materials prepared by the reflux technique, and samples with cryptomelane were more active than those prepared by the conventional methods. The catalyst with the highest performance also exhibited good stability and allowed 90% conversion of ethyl and butyl acetate to CO2 at 213 and 202 °C, respectively. Significant differences in the catalyst performance were observed, clearly indicating that K-OMS-2 nanorods prepared by the solvent-free reaction were better catalysts for the selected VOC oxidations than the mixtures of manganese oxides traditionally obtained with conventional synthesis methods. The superior performance of the K-OMS-2 catalysts might be related to the increased average oxidation state of the manganese in these structures. Significant correlations between the catalytic performance and the surface chemical properties were also identified, highlighting the K-OMS-2 properties associated with the enhanced catalytic performance of the materials.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62986-3
       
  • Self-metathesis of 1-butene to ethene and hexene over molybdenum-based
           heterogeneous catalysts
    • Authors: Ce Guo; Xiujie Li; Xiangxue Zhu; Weifeng Chu; Shenglin Liu; Yuzhong Wang; Peng Zeng; Shujing Guo; Longya Xu
      Pages: 37 - 46
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Ce Guo, Xiujie Li, Xiangxue Zhu, Weifeng Chu, Shenglin Liu, Yuzhong Wang, Peng Zeng, Shujing Guo, Longya Xu
      A novel route involving self-metathesis of 1-butene under mild conditions that gave high yields of ethene and hexene was proposed. The results of thermodynamic analysis revealed that the Gibbs energy of the target Metathesis I reaction (1-butene → ethene + 3-hexene) was much higher than that of the main side Metathesis II (1-butene + 2-butene → propene + 2-pentene). Suppression of 1-butene double-bond isomerization was the key step to increase the selectivity for the target olefin in the reaction network. The relationship between the catalytic performance and support nature was investigated in detail. On basis of H2-TPR, UV-Vis spectra and HRTEM results, an alumina (Al2O3) support with large surface area was beneficial for the dispersion of molybdenum (Mo) species. Both suitable acidity and sufficient Mo dispersion were important to selectively promote the self-metathesis reaction of 1-butene. On the optimal 6Mo/Al2O3 catalyst, 1-butene conversion reached 47% and ethene selectivity was as high as 42% on the premise of good catalytic stability (80 °C, 1.0 MPa, 3 h−1).
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62918-8
       
  • Immobilization of penicillin G acylase on paramagnetic polymer
           microspheres with epoxy groups
    • Authors: Xing Chen; Lu Yang; Wangcheng Zhan; Li Wang; Yun Guo; Yunsong Wang; Guanzhong Lu; Yanglong Guo
      Pages: 47 - 53
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Xing Chen, Lu Yang, Wangcheng Zhan, Li Wang, Yun Guo, Yunsong Wang, Guanzhong Lu, Yanglong Guo
      Paramagnetic polymer microspheres were synthesized by the inverse suspension polymerization method through polymerization of glycidyl methacrylate, ally glycidyl ether and methacrylamide on the surface of silica-coated Fe3O4 nanoparticles using N,N’-methylene-bis(acrylamide) as a cross-linking agent. Penicillin G acylase (PGA) was covalently immobilized on the surface of the paramagnetic microspheres by reacting the amino groups of the PGA molecules with the epoxy groups of the paramagnetic polymer microspheres. The effect of the SiO2 coating and the amount of paramagnetic Fe3O4 nanoparticles on the initial activity and the operational stability of the immobilized PGA was investigated. The results indicated that SiO2 played an important role in the polymerization process and paramagnetic polymer microspheres with a SiO2-coated Fe3O4 nanoparticles mass content of 7.5% are an optimal support material for PGA immobilization. Immobilized PGA on the paramagnetic polymer microspheres shows a high initial activity of 430 U/g (wet) and retains 99% of its initial activity after recycling 10 times. Furthermore, immobilized PGA exhibits high thermal stability, pH stability and excellent reusability, which can be rapidly recycled by the aid of magnet.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62934-6
       
  • High photocatalytic activities of zinc oxide nanotube arrays modified with
           tungsten trioxide nanoparticles
    • Authors: Yawen Li; Yuzhen Bu; Qian Liu; Xia Zhang; Junli Xu
      Pages: 54 - 62
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Yawen Li, Yuzhen Bu, Qian Liu, Xia Zhang, Junli Xu
      Well-aligned zinc oxide (ZnO) nanotube arrays loaded with tungsten trioxide (WO3) nanoparticles were synthesized by a process involving chemical bath deposition in combination with pyrolysis. The prepared ZnO–WO3 composites were characterized by X-ray diffraction, energy dispersive spectrometer, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, Fourier transform infrared spectroscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activities of the ZnO–WO3 composite photocatalysts with different WO3 contents for the degradation of the herbicide chlorinated phenoxyacetic acid (MCPA-Na) under simulated sunlight irradiation were systematically evaluated. It was found that the WO3 content had a great effect on the photocatalytic activity of the ZnO–WO3 composites. The composite with 3% WO3 showed the highest photocatalytic activity, with a degradation rate of chlorinated phenoxyacetic acid of 98.5% after 200 min with 20 mg of photocatalyst. This photodegradation rate was about twice that of the pristine ZnO nanotube array. The recombination of photogenerated electrons and holes was increasingly suppressed with the addition of WO3 to ZnO. The high relative content of defects on the surface of the ZnO–WO3 composites was beneficial to their photocatalytic activity in the degradation of chlorinated phenoxyacetic acid.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62977-2
       
  • Cycloaddition of CO2 with epoxides by using an amino-acid-based
           Cu(II)–tryptophan MOF catalyst
    • Authors: Gyeong Seon Jeong; Amal Cherian Kathalikkattil; Robin Babu; Yongchul Greg Chung; Dae Won Park
      Pages: 63 - 70
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Gyeong Seon Jeong, Amal Cherian Kathalikkattil, Robin Babu, Yongchul Greg Chung, Dae Won Park
      Metal organic frameworks (MOFs) constructed from natural/biological units (amino acids) are prospective candidates as catalysts in CO2 chemistry owing to their natural origin and high abundance of Lewis acid/base sites and functional groups. Herein, we report the catalytic efficiency of an amino-acid-based Cu-containing MOF, denoted as CuTrp (Trp = L-tryptophan). The CuTrp catalyst was synthesized by direct mixing at room temperature using methanol as a solvent—a synthetic route with notable energy efficiency. The catalyst was characterized using various physicochemical techniques, including XRD, FT-IR, TGA, XPS, ICP-OES, FE-SEM, and BET analysis. The catalytic activity of CuTrp was assessed in the synthesis of cyclic carbonates from epoxides and CO2. The CuTrp operated in synergy with the co-catalyst tetrabutylammonium bromide under solvent-free conditions. Several reaction parameters were studied to identify the optimal reaction conditions and a reaction mechanism was proposed based on experimental evidence and previous density functional theory studies. The CuTrp also exhibited satisfactory stability in water and could be reused more than three times without any significant loss of activity.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62916-4
       
  • Growth of Cu/SSZ-13 on SiC for selective catalytic reduction of NO with
           NH3
    • Authors: Tiaoyun Zhou; Qing Yuan; Xiulian Pan; Xinhe Bao
      Pages: 71 - 78
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Tiaoyun Zhou, Qing Yuan, Xiulian Pan, Xinhe Bao
      Silicon carbide (SiC) was used as a support for SSZ-13 zeolite in an attempt to improve the high-temperature stability and activity of Cu/SSZ-13 in the selective catalytic reduction (SCR) of NO with NH3. SSZ-13 was grown via a hydrothermal method using the silicon and silica contained in SiC as the source of silicon, which led to the formation of a chemically bonded SSZ-13 layer on SiC. Characterization using X-ray diffraction, scanning electron microscopy, and N2 adsorption-desorption isotherms revealed that the alkali content strongly affected the purity of zeolite and the crystallization time affected the coverage and crystallinity of the zeolite layer. Upon ion exchange, the resulting Cu/SSZ-13@SiC catalyst exhibited enhanced activity in NH3-SCR in the high-temperature region compared with the unsupported Cu/SSZ-13. Thus, the application temperature was extended with the use of SiC as the support.
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62870-5
       
  • A MoS2 nanocatalyst with surface-enriched active sites for the
           heterogeneous transfer hydrogenation of nitroarenes
    • Authors: Jia Wang; Yajie Zhang; Jiangyong Diao; Jiayun Zhang; Hongyang Liu; Dangsheng Su
      Pages: 79 - 87
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Jia Wang, Yajie Zhang, Jiangyong Diao, Jiayun Zhang, Hongyang Liu, Dangsheng Su
      A highly efficient and reusable plane-curved and interlayer-expanded MoS2 nanocatalyst with increased exposure of active sites was prepared. The catalyst was used for the heterogeneous hydrogen transfer reaction of nitroarenes with hydrazine monohydrate as a reductant under mild reaction conditions without pressure and base, which was different from other hydrogen transfer systems that require the presence of a base (e.g., propan-2-ol/KOH). The sandwiching of carbon between the MoS2 nanosheets increased the distance between the layers of MoS2 and exposed more Mo sites, resulting in superior catalytic performance compared with that of bulk MoS2 catalyst. The active hydrogen (H*) generated from N2H4 could directly transfer to the –NO2 groups of nitrobenzene to form aniline followed by N2 emission, which was confirmed by detecting the gas emission with mass spectrometry during the decomposition of hydrazine or the co-existence of nitrobenzene and hydrazine.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62925-5
       
  • Insight into MgO promoter with low concentration for the carbon-deposition
           resistance of Ni-based catalysts in the CO2 reforming of CH4
    • Authors: Xiangdong Feng; Jie Feng; Wenying Li
      Pages: 88 - 98
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Xiangdong Feng, Jie Feng, Wenying Li
      The CO2 reforming of CH4 is studied over MgO-promoted Ni catalysts, which were supported on alumina prepared from hydrotalcite. This presents an improved stability compared with non-promoted catalysts. The introduction of the MgO promoter was achieved through the ‘‘memory effect’’ of the Ni-Al hydrotalcite structure, and ICP-MS confirmed that only 0.42 wt.% of Mg2+ ions were added into the Ni-Mg/Al catalyst. Although no differences in the Ni particle size and basicity strength were observed, the Ni-Mg/Al catalyst showed a higher catalytic stability than the Ni/Al catalyst. A series of surface reaction experiments were used and showed that the addition of a MgO promoter with low concentration can promote CO2 dissociation to form active surface oxygen arising from the formation of the Ni-MgO interface sites. Therefore, the carbon-resistance promotion by nature was suggested to contribute to an oxidative environment around Ni particles, which would increase the conversion of carbon residues from CH4 cracking to yield CO on the Ni metal surface.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62928-0
       
  • In2O3-modified Cu/SiO2 as an active and stable catalyst for the
           hydrogenation of methyl acetate to ethanol
    • Authors: Yu Zhang; Chenliang Ye; Cuili Guo; Changna Gan; Xinmeng Tong
      Pages: 99 - 108
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Yu Zhang, Chenliang Ye, Cuili Guo, Changna Gan, Xinmeng Tong
      A series of indium oxide-modified Cu/SiO2 catalysts were synthesized and used to produce ethanol via methyl acetate hydrogenation. In-Cu/SiO2 catalyst containing 1.0 wt% In2O3 exhibited the best catalytic activity and stability. The physicochemical properties of the synthesized catalysts were investigated using several characterization methods and the results showed that introducing suitable indium to Cu/SiO2 increased the copper dispersion, diminished the copper crystallite size, and enriched the surface Cu+ concentration. Furthermore, the Cu/SiO2 catalyst gradually deactivated during the stability test, which was mainly attributed to copper sintering and the valence change in surface copper species. In contrast, indium addition can inhibit the thermal transmigration and accumulation of copper nanoparticles to stabilize the catalyst.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62932-2
       
  • Biosynthesis of copper nanoparticles supported on manganese dioxide
           nanoparticles using Centella asiatica L. leaf extract for the efficient
           catalytic reduction of organic dyes and nitroarenes
    • Authors: Mahmoud Nasrollahzadeh; Mohaddeseh Sajjadi; S. Mohammad Sajadi
      Pages: 109 - 117
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Mahmoud Nasrollahzadeh, Mohaddeseh Sajjadi, S. Mohammad Sajadi
      In this study we designed a novel, cost-efficient and green method for the synthesis of copper nanoparticles (Cu NPs) supported on manganese dioxide (MnO2) NPs, using Centella asiatica L. leaf extract as a naturally-sourced reducing agent, without stabilizers or surfactants. This synthetic process is environmentally-friendly and avoids the use of toxic reducing agents. Phenolic hydroxyl groups in the leaf extract are believed to reduce Cu2+ in solution to generate Cu NPs that are subsequently stabilized on the MnO2 NP surfaces. The resulting Cu/MnO2 nanocomposite was fully characterized using X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. This material was found to function as a highly active, efficient and recyclable heterogeneous catalyst for the reduction of Congo red, rhodamine B and methylene blue as well as nitro compounds such as 2,4-dinitrophenylhydrazine and 4-nitrophenol in the presence of NaBH4 in aqueous media at ambient temperature. The high stability of the Cu/MnO2 nanocomposite also allows the catalyst to be separated and reused several times without any significant loss of activity.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62915-2
       
  • Mn/beta and Mn/ZSM-5 for the low-temperature selective catalytic reduction
           of NO with ammonia: Effect of manganese precursors
    • Authors: Wenjin Xu; Guangxu Zhang; Hanwei Chen; Guomeng Zhang; Yang Han; Yichuan Chang; Peng Gong
      Pages: 118 - 127
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Wenjin Xu, Guangxu Zhang, Hanwei Chen, Guomeng Zhang, Yang Han, Yichuan Chang, Peng Gong
      Two series of Mn/beta and Mn/ZSM-5 catalysts were prepared to study the influence of how different Mn precursors, introduced to the respective parent zeolites by wet impregnation, affected the selective catalytic reduction (SCR) of NO by NH3 across a low reaction temperature window of 50–350 °C. In this study, the catalysts were characterized using N2 adsorption/desorption, X-ray diffraction, X-ray fluorescence, H2 temperature-programmed reduction, NH3 temperature-programmed desorption and X-ray photoelectron spectroscopy. As the manganese chloride precursor only partially decomposed this primarily resulted in the formation of MnCl2 in addition to the presence of low levels of crystalline Mn3O4, which resulted in poor catalytic performance. However, the manganese nitrate precursor formed crystalline MnO2 as the major phase in addition to a minor presence of unconverted Mn-nitrate. Furthermore, manganese acetate resulted principally in a mixture of amorphous Mn2O3 and MnO2, and crystalline Mn3O4. From all the catalysts screened, the test performance data showed Mn/beta-Ac to exhibit the highest NO conversion (97.5%) at 240 °C, which remained >90% across a temperature window of 220–350 °C. The excellent catalytic performance was ascribed to the enrichment of highly dispersed MnO x (Mn2O3 and MnO2) species that act as the active phase in the NH3-SCR process. Furthermore, together with a suitable amount of weakly acidic centers, higher concentration of surface manganese and a greater presence of surface labile oxygen groups, SCR performance was collectively enhanced at low temperature.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62983-8
       
  • Ag nanoparticles deposited on oxygen-vacancy-containing BiVO4 for enhanced
           near-infrared photocatalytic activity
    • Authors: Chunjing Shi; Xiaoli Dong; Xiuying Wang; Hongchao Ma; Xiufang Zhang
      Pages: 128 - 137
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Chunjing Shi, Xiaoli Dong, Xiuying Wang, Hongchao Ma, Xiufang Zhang
      This study investigates the photodegradation of the organic dye rhodamine B by Ag-nanoparticle-containing BiVO4 catalysts under different irradiation conditions. The catalysts consist of Ag nanoparticles deposited on oxygen-vacancy-containing BiVO4. The morphology of the BiVO4 is olive shaped, and it has a uniform size distribution. The BiVO4 possesses a high oxygen vacancy density, and the resulting Ag nanoparticle-BiVO4 catalyst exhibits higher photocatalytic activity than BiVO4. The RhB degradation by the Ag nanoparticle-BiVO4 catalyst is 99% after 100 min of simulated solar irradiation. BiVO4 containing oxygen vacancies as a rationally designed support extends the catalyst response into the near-infrared region, and facilitates the trapping and transfer of plasmonic hot electrons. The enhanced photocatalytic efficiency is attributed to charge transfer from the BiVO4 to Ag nanoparticles, and surface plasmon resonance of the Ag nanoparticles. These insights into electron-hole separation and charge transfer may arouse interest in solar-driven wastewater treatment and water splitting.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62990-5
       
  • Copper-catalyzed tandem radical amination/1,2-carbon migration of allylic
           alcohols: Direct access to α-quaternary-β-amino ketones
    • Authors: Jiaqiong Sun; Guangfan Zheng; Yongmei Fu; Qiao Zhang; Yimin Wang; Qian Zhang; Yan Li; Qian Zhang
      Pages: 138 - 145
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Jiaqiong Sun, Guangfan Zheng, Yongmei Fu, Qiao Zhang, Yimin Wang, Qian Zhang, Yan Li, Qian Zhang
      A novel nitrogen-centered radical-induced 1,2-carbon migration reaction of allylic alcohols has been developed. This method provides easy access to a variety of α-quaternary-β-amino ketones under mild reaction conditions. The reaction has a wide substrate scope and operational simplicity. Mechanistic studies suggest that 1,2-carbon migration is induced by regioselective nitrogen-centered radical addition to the alkene unit.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(18)63028-1
       
  • Formation mechanism of highly dispersed semi-embedded ruthenium
           nanoparticles in porous carbon matrix determined by in situ
           temperature-programmed infrared spectroscopy
    • Authors: Guojun Lan; Yaping Zhou; Hangjia Shen; Haodong Tang; Ying Li
      Pages: 146 - 156
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Guojun Lan, Yaping Zhou, Hangjia Shen, Haodong Tang, Ying Li
      The carbonization process of a sucrose-RuCl3/SBA-15 composite towards a Ru-containing ordered mesoporous carbon (Ru-OMC) catalyst was studied by in situ temperature-programmed infrared spectroscopy to identify the stabilization role of organic carbon precursors during the formation of highly dispersed Ru nanoparticles. The results show that the formation of metal carbonyl species results in the formation of homogeneously distributed Ru nanoparticles, and the rigid silica support and carbon matrix around the Ru(CO) x complex can significantly avoid the sintering and agglomeration of Ru metal particles during elevated temperature thermal treatment. These results ultimately demonstrate that sucrose plays important roles in the formation of homogeneously distributed Ru nanoparticles in a porous carbon matrix.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62958-9
       
  • Ru/FeOx catalyst performance design: Highly dispersed Ru species for
           selective carbon dioxide hydrogenation
    • Authors: Di Zhang; Jingjie Luo; Jiajie Wang; Xin Xiao; Yuefeng Liu; Wei Qi; Dang Sheng Su; Wei Chu
      Pages: 157 - 166
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Di Zhang, Jingjie Luo, Jiajie Wang, Xin Xiao, Yuefeng Liu, Wei Qi, Dang Sheng Su, Wei Chu
      A series of Ru/FeO x catalysts were synthesized for the selective hydrogenation of CO2 to CO. Detailed characterizations of the catalysts through X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and temperature-programmed techniques were performed to directly monitor the surface chemical properties and the catalytic performance to elucidate the reaction mechanism. Highly dispersed Ru species were observed on the surface of FeO x regardless of the initial Ru loading. Varying the Ru loading resulted in changes to the Ru coverage over the FeO x surface, which had a significant impact on the interaction between Ru and adsorbed H, and concomitantly, the H2 activation capacity via the ability for H2 dissociation. FeO x having 0.01% of Ru loading exhibited 100% selectivity toward CO resulting from the very strong interaction between Ru and adsorbed H, which limits the desorption of the activated H species and hinders over-reduction of CO to CH4. Further increasing the Ru loading of the catalysts to above 0.01% resulted in the adsorbed H to be easily dissociated, as a result of a weaker interaction with Ru, which allowed excessive CO reduction to produce CH4. Understanding how to selectively design the catalyst by tuning the initial loading of the active phase has broader implications on the design of supported metal catalysts toward preparing liquid fuels from CO2.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62967-x
       
  • Synthesis, characterization, and catalytic performance of hierarchical
           ZSM-11 zeolite synthesized via dual-template route
    • Authors: Hui Liu; Shuang Zhang; Sujuan Xie; Wanshuo Zhang; Wenjie Xin; Shenglin Liu; Longya Xu
      Pages: 167 - 180
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Hui Liu, Shuang Zhang, Sujuan Xie, Wanshuo Zhang, Wenjie Xin, Shenglin Liu, Longya Xu
      Hierarchical zeolite materials were prepared via one-pot synthesis of ZSM-11 zeolites with different molar ratios (R) of a mesoporogen, i.e., cetyltrimethylammonium bromide template (CTAB), to a microporogen, i.e., tetra-n-butylammonium bromide (TBABr). The structures, morphologies, and textural properties of the resultant materials were investigated. Initially, with increasing R, the crystal size of the synthesized product decreased, the number of intercrystalline mesopores increased, and a pure ZSM-11 zeolite phase was present. Then an MCM-41-like phase was produced and embedded in the ZSM-11 zeolite phase. Finally, an MCM-41-like phase was obtained. The alkalinity had important effects on the physicochemical and textural properties of the prepared samples. A possible mechanism of formation of the hierarchical ZSM-11 zeolite was proposed on the basis of a combination of various characterization results. The role of CTAB varied depending on the R value, and it showed a capping effect, micellar effect, and template effect. These effects of CTAB were synergetic in ZSM-11 synthesis, but they were competitive with the structure-directing effect of TBABr. In addition, the impact of the acidic properties and porosities of the hierarchical ZSM-11 catalysts on their performances in the alkylation of benzene with dimethyl ether was investigated.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62984-x
       
  • Ceria-modified hierarchical Hβ zeolite as a robust solid acid catalyst
           for alkenylation of p-xylene with phenylacetylene
    • Authors: Yongle Guo; Yu Zhang; Zhongkui Zhao
      Pages: 181 - 189
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Yongle Guo, Yu Zhang, Zhongkui Zhao
      A ceria-modified hierarchical Hβ zeolite was prepared by a desilication-dealumination procedure followed by ceria modification. The catalytic performance of the ceria-modified and unmodified hierarchical Hβ zeolite catalysts for alkenylation of p-xylene with phenylacetylene was investigated. Various characterization techniques, including X-ray diffraction, X-ray fluorescence, nitrogen adsorption-desorption, and NH3 temperature-programmed desorption, were used to examine the structure-performance relationships. Our results show that the optimized ceria-modified hierarchical Hβ zeolite catalyst demonstrated higher catalytic activity, selectivity, and stability for alkenylation of p-xylene with phenylacetylene than those of pristine Hβ zeolite. This performance was attributed to more acidic sites and improved accessibility to active sites through larger pores, together with a higher mesoporous surface area and volume resulting from the hierarchical pore architecture and ceria modification. Thus, our 5 wt% CeO2-Hβ-B0.2A0.2 catalyst shows great potential for producing alkenyl aromatics through solid acid catalyzed alkenylation.
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      PubDate: 2018-02-26T07:26:05Z
      DOI: 10.1016/s1872-2067(17)62985-1
       
  • A review on TiO2-based Z-scheme photocatalysts
    • Authors: Kezhen Qi; Bei Cheng; Jiaguo Yu; Wingkei Ho
      Pages: 1936 - 1955
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Kezhen Qi, Bei Cheng, Jiaguo Yu, Wingkei Ho
      TiO2-based Z-scheme photocatalysts have attracted considerable attention because of the low recombination rate of their photogenerated electron–hole pairs and their high photocatalytic efficiency. In this review, the reaction mechanism of Z-scheme photocatalysts, recent research progress in the application of TiO2-based Z-scheme photocatalysts, and improved methods for photocatalytic performance enhancement are explored. Their applications, including water splitting, CO2 reduction, decomposition of volatile organic compounds, and degradation of organic pollutants, are also described. The main factors affecting the photocatalytic performance of TiO2-based Z-scheme photocatalysts, such as pH, conductive medium, cocatalyst, architecture, and mass ratio, are discussed. Concluding remarks are presented, and some suggestions for the future development of TiO2-based Z-scheme photocatalysts are highlighted.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62962-0
       
  • Review on porous nanomaterials for adsorption and photocatalytic
           conversion of CO2
    • Authors: Yajuan Ma; Zemei Wang; Xiaofeng Xu; Jingyu Wang
      Pages: 1956 - 1969
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Yajuan Ma, Zemei Wang, Xiaofeng Xu, Jingyu Wang
      Photocatalytic conversion of “greenhouse gas” CO2 is considered to be one of the most effective ways to alleviate current energy and environmental problems without additional energy consumption and pollutant emission. The performance of many traditional semiconductor photocatalysts is not efficient enough to satisfy the requirements of practical applications because of their limited specific surface area and low CO2 adsorption capacity. Therefore, the exploration of photocatalysts with high CO2 uptake is significant in the field of CO2 conversion. Recently the porous materials appeared to be a kind of superior candidate for enriching the CO2 molecules on the surface of photocatalysts for catalytic conversion. This paper first summarizes the advances in the development of nanoporous adsorbents for CO2 capture. Three main classes of porous materials are considered: inorganic porous materials, metal organic frameworks, and microporous organic polymers. Based on systematic research on CO2 uptake, we then highlight the recent progress in these porous-material-based photocatalysts for CO2 conversion. Benefiting from the improved CO2 uptake capacity, the porous-material-based photocatalysts exhibited remarkably enhanced efficiency in the reduction of CO2 to chemical fuels, such as CO, CH4, and CH3OH. Based on reported recent achievements, we predict a trend of development in multifunctional materials with both high adsorption capability and photocatalytic performance for CO2 utilization.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62955-3
       
  • Improved visible-light photocatalytic H2 generation over CdS nanosheets
           decorated by NiS2 and metallic carbon black as dual earth-abundant
           cocatalysts
    • Authors: Song Ma; Xingmin Xu; Jun Xie; Xin Li
      Pages: 1970 - 1980
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Song Ma, Xingmin Xu, Jun Xie, Xin Li
      CdS nanosheets (NSs) photocatalysts modified with dual earth-abundant co-catalysts of metallic carbon black (CB) and NiS2 were synthesized by a two-step solvothermal/impregnation method. All the experiment results demonstrated that the co-loading of CB and NiS2 could significantly enhance the photocatalytic H2-evolution activity of CdS NSs. The photocatalytic performance of the as-prepared CdS/CB/NiS2 samples was tested under visible light (λ ≥ 420 nm) by using an aqueous solution containing 0.25 mol L−1 Na2S-Na2SO3 as the sacrifice agent. The CdS-0.5%CB-1.0%NiS2 composite photocatalysts exhibited the highest H2-evolution rate of 166.7 μmol h−1, which was approximately 5.16 and 1.87 times higher than those of pure CdS NSs and CdS-1.0%NiS2, respectively. The possible mechanism for the enhanced H2-evolution activity of CdS/CB/NiS2 composite photocatalysts was proposed. The results showed that the enhanced photocatalytic H2-evolution activities could be ascribed to the co-loading of metallic CB and NiS2 as co-catalysts onto the surface of CdS NSs. The excellent synergetic effect between the CB and NiS2 could obviously improve visible light absorption, promote separation of photogenerated electron-hole pairs and boost the H2-evolution kinetics, thus leading to an enhanced activity for H2 evolution. More interestingly, the metallic CB could not only act as a cocatalyst for H2 evolution, but also serve as a conductive electron bridge to promote the charge migration. This work not only demonstrates that loading CB as a co-catalyst is a promising strategy to further boost the photocatalytic activity of CdS/NiS2 composites, but also offers a new mechanistic insight into the construction of highly efficient and stable CdS NSs-based hybrid photocatalysts with dual earth-abundant co-catalysts for photocatalytic applications.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62965-6
       
  • A comparison study of alkali metal-doped g-C3N4 for visible-light
           photocatalytic hydrogen evolution
    • Authors: Jing Jiang; Shaowen Cao; Chenglong Hu; Chunhua Chen
      Pages: 1981 - 1989
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Jing Jiang, Shaowen Cao, Chenglong Hu, Chunhua Chen
      Photocatalytic hydrogen production based on semiconductor photocatalysts has been considered as one of the most promising strategies to resolve the global energy shortage. Graphitic carbon nitride (g-C3N4) has been a star visible-light photocatalyst in this field due to its various advantages. However, pristine g-C3N4 usually exhibits limited activity. Herein, to enhance the performance of g-C3N4, alkali metal ion (Li+, Na+, or K+)-doped g-C3N4 are prepared via facile high-temperature treatment. The prepared samples are characterized and analyzed using the technique of XRD, ICP-AES, SEM, UV-vis DRS, BET, XPS, PL, TRPL, photoelectrochemical measurements, photocatalytic tests, etc. The resultant doped photocatalysts show enhanced visible-light photocatalytic activities for hydrogen production, benefiting from the increased specific surface areas (which provide more active sites), decreased band gaps for extended visible-light absorption,land improved electronic structures for efficient charge transfer. In particular, because of the optimal tuning of both microstructure and electronic structure, the Na-doped g-C3N4 shows the most effective utilization of photogenerated electrons during the water reduction process. As a result, the highest photocatalytic performance is achieved over the Na-doped g-C3N4 photocatalyst (18.7 μmol/h), 3.7 times that of pristine g-C3N4 (5.0 μmol/h). This work gives a systematic study for the understanding of doping effect of alkali metals in semiconductor photocatalysis.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62936-x
       
  • Selective adsorption of thiocyanate anions on Ag-modified g-C3N4 for
           enhanced photocatalytic hydrogen evolution
    • Authors: Feng Chen; Hui Yang; Wei Luo; Ping Wang; Huogen Yu
      Pages: 1990 - 1998
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Feng Chen, Hui Yang, Wei Luo, Ping Wang, Huogen Yu
      Silver-modified semiconductor photocatalysts typically exhibit enhanced photocatalytic activity toward the degradation of organic substances. In comparison, their hydrogen-evolution rates are relatively low owing to poor interfacial catalytic reactions to producing hydrogen. In the present study, thiocyanate anions (SCN−) as interfacial catalytic active sites were selectively adsorbed onto the Ag surface of g-C3N4/Ag photocatalyst to promote interfacial H2-evolution reactions. The thiocyanate-modified g-C3N4/Ag (g-C3N4/Ag-SCN) photocatalysts were synthesized via photodeposition of metallic Ag on g-C3N4 and subsequent selective adsorption of SCN− ions on the Ag surface by an impregnation method. The resulting g-C3N4/Ag-SCN photocatalysts exhibited considerably higher photocatalytic H2-evolution activity than the g-C3N4, g-C3N4/Ag, and g-C3N4/SCN photocatalysts. Furthermore, the g-C3N4/Ag-SCN photocatalyst displayed the highest H2-evolution rate (3.9 μmol h−1) when the concentration of the SCN− ions was adjusted to 0.3 mmol L−1. The H2-evolution rate obtained was higher than those of g-C3N4 (0.15 μmol h−1) and g-C3N4/Ag (0.71 μmol h−1). Considering the enhanced performance of g-C3N4/Ag upon minimal addition of SCN− ions, a synergistic effect of metallic Ag and SCN− ions is proposed—the Ag nanoparticles act as an effective electron-transfer mediator for the steady capture and rapid transportation of photogenerated electrons, while the adsorbed SCN− ions serve as an interfacial active site to effectively absorb protons from solution and promote rapid interfacial H2-evolution reactions. Considering the present facile synthesis and its high efficacy, the present work may provide new insights into preparing high-performance photocatalytic materials.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62971-1
       
  • Boosting the photocatalytic performance of Ag2CO3 crystals in phenol
           degradation via coupling with trace N-CQDs
    • Authors: Jian Tian; Renyue Liu; Zhen Liu; Changlin Yu; Minchao Liu
      Pages: 1999 - 2008
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Jian Tian, Renyue Liu, Zhen Liu, Changlin Yu, Minchao Liu
      A series of N-CQDs/Ag2CO3 composite crystals (where N-CQDs = Nitrogen doped carbon quantum dots) were prepared by adding different volumes of a solution of N-CQDs during Ag2CO3 crystal growth. Under irradiation from a 350-W Xe lamp light (with optical filter, λ ≥ 420 nm), the performance of N-CQDs/Ag2CO3 in photocatalytic degradation of phenol was evaluated. The as-prepared samples were analyzed by XRD, SEM, TEM, BET, element mapping, UV-vis DRS, FT-IR, XPS, transient photocurrent response and EIS testing. The results showed that after coupling with trace amounts of N-CQDs, both the photocatalytic activity and stability of Ag2CO3 were greatly boosted. The addition of N-CQDs solution influenced the crystallization of Ag2CO3, resulting in a distinct decrease in Ag2CO3 crystal size and an obvious increase in surface area. Moreover, the charge transfer resistance was greatly reduced, and the separation efficiency of photogenerated electrons and holes was strongly promoted. The presence of NCQDs on the surface of the catalysts facilitates the transfer of photogenerated electrons, slowing the photocorrosion rate of Ag2CO3, and then resulting in higher stability than bare Ag2CO3 in degradation. The synergistic effect of the improvement of morphology and charge transfer rate thus accounted for the superior photocatalytic performance of N-CQDs/Ag2CO3.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62926-7
       
  • Photocatalytic degradation of sulfamethazine by graphitic carbon
           nitride-modified zinc molybdate: Effects of synthesis method on
           performance, degradation kinetics, and mechanism
    • Authors: Jing Zhang; Xuhui Mao; Wei Xiao; Yanfeng Zhuang
      Pages: 2009 - 2020
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Jing Zhang, Xuhui Mao, Wei Xiao, Yanfeng Zhuang
      In the present study, zinc molybdate (β-ZnMoO4) and graphitic carbon nitride (g-C3N4)-modified β-ZnMoO4 (β-ZnMoO4/g-C3N4) were prepared to decontaminate aqueous solutions from the antibiotic sulfamethazine (SMZ). Our results revealed that the hydrothermal synthesis method greatly influenced the photocatalytic activity of the resultant catalysts. The pristine β-ZnMoO4 samples obtained under more intensive synthesis conditions (24 h at 280 °C) showed higher photocatalytic activity than that prepared for 12 h at 180 °C (denoted β-ZnMoO4-180). In the case of in situ hydrothermal synthesis of β-ZnMoO4/g-C3N4, a surface-modified sample was only obtained under the reaction conditions of 180 °C for 12 h. Compared with the sheet-like β-ZnMoO4-180 sample, the β-ZnMoO4-180/g-C3N4 composite showed enhanced photocatalytic activity for the degradation of SMZ. By contrast, the hydrothermal reaction at 280 °C caused the gradual decomposition of g-C3N4. It is believed that the structural incorporation of g-C3N4 into β-ZnMoO4 at 280 °C might disrupt the crystal growth, thereby deteriorating the performance of the composite catalysts formed at this temperature. For the composite catalysts prepared by the ultrasonic method, a remarkable increase in the degradation rate of SMZ was only observed at a high g-C3N4 content of 8 mol%. The photocatalytic degradation of SMZ by β-ZnMoO4-180/g-C3N4 composite catalysts followed pseudo-first-order kinetics. Further study of the photocatalytic mechanism revealed that holes and superoxide radicals were the dominant oxidative species in the photodegradation process. The enhanced photocatalytic performance of the composites was attributed to the higher separation efficiency of the photogenerated electron-hole pairs at heterogeneous junctions. The degradation intermediates of SMZ were detected by liquid chromatography-mass spectrometry, from which plausible reaction pathways for the photodegradation of SMZ were proposed. Our results indicated that the synthesis method for g-C3N4 composites should be carefully selected to achieve superior photocatalytic performance.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62935-8
       
  • Construction of Z-scheme Ag3PO4/Bi2WO6 composite with excellent
           visible-light photodegradation activity for removal of organic
           contaminants
    • Authors: Zhongliao Wang; Taiping Hu; Kai Dai; Jinfeng Zhang; Changhao Liang
      Pages: 2021 - 2029
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Zhongliao Wang, Taiping Hu, Kai Dai, Jinfeng Zhang, Changhao Liang
      Ag3PO4 has good potential for use in photocatalytic degradation of organic contaminants. However, the activity and stability of Ag3PO4 is hard to sustain because of photocorrosion and the positive potential of the conduction band of Ag3PO4. In this study, A composite consisting of Bi2WO6 nanosheets and Ag3PO4 was developed to curb recombination of charge carriers and enhance the activity and stability of the catalyst. Formation of a Ag3PO4/Bi2WO6 composite was confirmed using X-ray diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Photoluminescence spectroscopy provided convincing evidence that compositing Bi2WO6 with Ag3PO4 effectively reduced photocorrosion of Ag3PO4. The Ag3PO4/Bi2WO6 composite gave a high photocatalytic performance in photodegradation of methylene blue. A degradation rate of 0.61 min−1 was achieved; this is 1.3 and 6.0 times higher than those achieved using Ag3PO4 (0.47 min−1) and Bi2WO6 (0.10 min−1), respectively. Reactive species trapping experiments using the Ag3PO4/Bi2WO6 composite showed that holes, ·OH, and ·O2 − all played specific roles in the photodegradation process. The photocatalytic mechanism was investigated and a Z-scheme was proposed as a plausible mechanism.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62942-5
       
  • Facile synthesis of Bi12O17Br2 and Bi4O5Br2 nanosheets: In situ DRIFTS
           investigation of photocatalytic NO oxidation conversion pathway
    • Authors: Wendong Zhang; Xiaoli Liu; Xing'an Dong; Fan Dong; Yuxin Zhang
      Pages: 2030 - 2038
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Wendong Zhang, Xiaoli Liu, Xing'an Dong, Fan Dong, Yuxin Zhang
      Bi12O17Br2 and Bi4O5Br2 visible-light driven photocatalysts, were respectively fabricated by hydrothermal and room-temperature deposition methods with the use of BiBr3 and NaOH as precursors. Both Bi12O17Br2 and Bi4O5Br2 were composed of irregular nanosheets. The Bi4O5Br2 nanosheets exhibited high and stable visible-light photocatalytic efficiency for ppb-level NO removal. The performance of Bi4O5Br2 was markedly higher than that of the Bi12O17Br2 nanosheets. The hydroxyl radical (•OH) was determined to be the main reactive oxygen species for the photo-degradation processes of both Bi12O17Br2 and Bi4O5Br2. However, in situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that Bi12O17Br2 and Bi4O5Br2 featured different conversion pathways for visible light driven photocatalytic NO oxidation. The excellent photocatalytic activity of Bi4O5Br2 resulted from a high surface area and large pore volumes, which facilitated the transport of reactants and intermediate products, and provided more active sites for photochemical reaction. Furthermore, the Bi4O5Br2 nanosheets produced more •OH and presented stronger valence band hole oxidation. In addition, the oxygen atoms of NO could insert into oxygen-vacancies of Bi4O5Br2, which provided more active sites for the reaction. This work gives insight into the photocatalytic pollutant-degradation mechanism of bismuth oxyhalide.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62941-3
       
  • Synthesis and photocatalytic hydrogen production activity of the
           Ni-CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 hybrid layered perovskite
    • Authors: Bing Zhang; Danping Hui; Yingxuan Li; He Zhao; Chuanyi Wang
      Pages: 2039 - 2047
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Bing Zhang, Danping Hui, Yingxuan Li, He Zhao, Chuanyi Wang
      The nickel-based complex Ni-CH3CH2NH2-intercalated niobate layered perovskite Ni-CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 was synthesized via a facile in situ chemical reaction method. Using ultrathin H1.78Sr0.78Bi0.22Nb2O7 nanosheets and nickel acetate as precursors. The composition, structure, photophysical properties, and photocatalytic activity for H2 production of Ni-CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 were studied systematically. The photocatalyst loaded with 0.5 wt% Ni exhibited the highest H2 evolution rate of 372.67 μmo/h. This was 0.54 times higher than the activity of the H1.78Sr0.78Bi0.22Nb2O7 nanosheets. The activity of the optimized Ni-CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 was comparable to that of the Pt-loaded sample under the same reaction conditions. The photocatalytic activity of the Ni-CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 was mainly attributed to the excellent separation of photogenerated carriers, after formation of the intercalated complex Ni-CH3CH2NH2. This study provides a facile strategy to synthesize a non-precious metal-loaded photocatalyst for H2 production.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62953-x
       
  • A visible-light-active Au-Cu(I)@Na2Ti6O13 nanostructured hybrid pasmonic
           photocatalytic membrane for acetaldehyde elimination
    • Authors: Jingjing Yang; Baoshun Liu; Xiujian Zhao
      Pages: 2048 - 2055
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Jingjing Yang, Baoshun Liu, Xiujian Zhao
      The present article reports a novel self-standing nanostructured Au-Cu(I)@Na2Ti6O13 plasmonic photocatalytic membrane, which is prepared by a hydrothermal reaction followed by a simple subsequent heat treatment process. The morphological structure, elemental composition, crystalline phases, and optical properties of the membrane were studied in detail by field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and ultraviolet-visible spectroscopy. Compared with that of a pure Na2Ti6O13 membrane, the Au-Cu(I)@Na2Ti6O13 membrane displayed much higher photocatalytic activity for the decomposition of acetaldehyde, a typical volatile organic compound, under visible light illumination. It was found that the photocatalytic activity of the Au-Cu(I)@Na2Ti6O13 membrane increased as the amount of Au was increased. The membrane loaded with 2.85 wt% Au showed the highest photocatalytic activity in the decomposition of acetaldehyde of the investigated materials. We found that in the photocatalyst membrane, Na2Ti6O13 acted as a support material, Au displayed plasmonic absorption, and Cu(I) behaved as a co-catalyst. The present membrane materials can avoid the self-aggregation typically observed during the course of photocatalytic reactions. As a result, they can be easily separated, recycled, and reactivated after their practical application, making these functional materials attractive for use in air cleaning applications.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62954-1
       
  • Construction of CuO-modified zeolitic imidazolate framework-9 for
           photocatalytic hydrogen evolution
    • Authors: Kai Fan; Zhiliang Jin; Hong Yuan; Hongyan Hu; Yingpu Bi
      Pages: 2056 - 2066
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Kai Fan, Zhiliang Jin, Hong Yuan, Hongyan Hu, Yingpu Bi
      An efficient CuO-modified zeolitic imidazolate framework-9 (ZIF-9) photocatalyst is successfully prepared at room temperature under mild conditions. It is observed that the ZIF-9/CuO photocatalyst is effective for H2 generation under visible light with sacrificial agent conditions. When the CuO is introduced, the photocatalytic properties of ZIF-9 are greatly improved and when the content of CuO is 40%, the photocatalytic activity reaches a maximum of 78.74 μmol after 5 h. This results from the 200–300 nm cube structure of ZIF-9 being able to adsorb more dye molecules and the CuO, which connects with ZIF-9, greatly improving the electronic transmission efficiency. Moreover, the interaction between the dye molecule Eosin Y (EY) and the catalyst is also studied by transient fluorescence spectroscopy. A series of characterizations, such as SEM, TEM, XPS, XRD, UV-vis, FTIR, transient fluorescence and photocurrent, are conducted, and the results are in good agreement with the experimental result. In addition, the possible reaction mechanism over EY-sensitized ZIF-9/CuO under visible light irradiation is proposed.
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      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62969-3
       
  • Photocatalytic hydrogen evolution activity over MoS2/ZnIn2S4 microspheres
    • Authors: Bo Chai; Chun Liu; Chunlei Wang; Juntao Yan; Zhandong Ren
      Pages: 2067 - 2075
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Bo Chai, Chun Liu, Chunlei Wang, Juntao Yan, Zhandong Ren
      MoS2/ZnIn2S4 composites with MoS2 anchored on the surface of ZnIn2S4 microspheres were synthesized by a two-step hydrothermal process. The obtained samples were characterized by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, ultraviolet–visible diffuse reflectance absorption spectroscopy, nitrogen adsorption–desorption measurements, photoluminescence spectroscopy, and photoelectrochemical tests. The influence of the loading of MoS2 on the photocatalytic H2 evolution activity was investigated using lactic acid as a sacrificial reagent. A H2 evolution rate of 343 μmol/h was achieved under visible light irradiation over the 1 wt% MoS2/ZnIn2S4 composite, corresponding to an apparent quantum efficiency of about 3.85% at 420 nm monochromatic light. The marked improvement of the photocatalytic H2 evolution activity compared with ZnIn2S4 can be ascribed to efficient transfer and separation of photogenerated charge carriers and facilitation of the photocatalytic H2 evolution reaction at the MoS2 active sites.
      Graphical abstract image

      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62981-4
       
  • Humic acid-mediated visible-light degradation of phenol on
           phosphate-modified and Nafion-modified TiO2 surfaces
    • Authors: Longhui Zheng; Xiaojuan Yu; Mingce Long; Qilin Li
      Pages: 2076 - 2084
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Longhui Zheng, Xiaojuan Yu, Mingce Long, Qilin Li
      Although humic acid (HA) can inhibit TiO2 photocatalysis, it can sensitize TiO2 and induce significant visible-light (VL) activity in phenol degradation. This favorable effect of HA was negligible on phosphate-modified TiO2 (P-TiO2), but significantly stronger on Nafion-modified TiO2 (Nf-TiO2). The reaction rate constants for phenol degradation on Nf-TiO2 increased from (0.003±0.001) to (0.025±0.003) min−1 when the reaction was performed in the presence of 20 mg/L HA. The different effects of HA on P-TiO2 and Nf-TiO2 photocatalysis cannot be attributed to adsorption changes, because the adsorption capacities of P-TiO2 and Nf-TiO2 were only slightly lower than that of TiO2 at an initial HA concentration of 20 mg/mL. Scavenger tests, electron paramagnetic resonance spectroscopy, and H2O2 detection were taken to understand the low VL activity of the P-TiO2/HA suspension. The main active species for phenol degradation in the TiO2 and Nf-TiO2 suspensions were superoxide radicals. There were negligible amounts of superoxide radicals in the P-TiO2/HA suspension, possibly because a direct four-electron oxygen reduction reaction occurred. The better VL activity of Nf-TiO2 was rationalized on the basis of Mott–Schottky and electrochemical impedance plots. Nafion modification resulted in cathodic shifts of the energy band positions, increased electron density, and less resistance to electron transfer across the interface between TiO2 and electrolytes. All these factors facilitated electron transfer and improved the production of active species. Phosphate modification therefore did not improve the VL response of HA sensitized TiO2, and low concentrations of HA can facilitate VL photocatalytic degradation of organic pollutants on Nafion surface-modified TiO2.
      Graphical abstract image

      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62951-6
       
  • Highly photoreactive TiO2 hollow microspheres with super thermal stability
           for acetone oxidation
    • Authors: Li Liang; Kaining Li; Kangle Lv; Wingkei Ho; Youyu Duan
      Pages: 2085 - 2093
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Li Liang, Kaining Li, Kangle Lv, Wingkei Ho, Youyu Duan
      TiO2 hollow microspheres (TiO2-HMSs) have attracted much attention because of their high photoreactivity, low density, and good permeability. However, anatase TiO2-HMSs have poor thermal stability. In this study, surface-fluorinated TiO2-HMSs were assembled from hollow nanoparticles by the hydrothermal reaction of the mixed Ti(SO4)2–NH4HF–H2O2 solution at 180 °C. The effect of the calcination temperature on the structure and photoreactivity of the TiO2-HMSs was systematically investigated, which was evaluated by photocatalytic oxidation of acetone in air under ultraviolet irradiation. We found that after calcination at 300 °C, the photoreactivity of the TiO2-HMSs decreases from 1.39 × 10−3 min−1 (TiO2-HMS precursor) to 0.82 × 10−3 min−1 because of removal of surface-adsorbed fluoride ions. With increasing calcination temperature from 300 to 900 °C, the building blocks of the TiO2-HMSs evolve from truncated bipyramidal shaped hollow nanoparticles to round solid nanoparticles, and the photoreactivity of the TiO2-HMSs steady increases from 0.82 × 10−3 to 2.09 × 10−3 min−1 because of enhanced crystallization. Further increasing the calcination temperature to 1000 and 1100 °C results in a decrease of the photoreactivity, which is ascribed to a sharp decrease of the Brunauer–Emmett–Teller surface area and the beginning of the anatase–rutile phase transformation at 1100 °C. The effect of surface-adsorbed fluoride ions on the thermal stability of the TiO2-HMSs is also discussed.
      Graphical abstract image

      PubDate: 2018-01-10T10:36:40Z
      DOI: 10.1016/s1872-2067(17)62952-8
       
  • Selective oxidation of C–H bonds with Fe-N-C single-atom catalyst
    • Authors: Xingwei
      Abstract: Publication date: January 2018
      Source:Chinese Journal of Catalysis, Volume 39, Issue 1
      Author(s): Xingwei Li
      Graphical abstract image

      PubDate: 2018-02-26T07:26:05Z
       
  • Preface to Special Issue on Photocatalysis in China
    • Authors: Jiaguo
      Abstract: Publication date: December 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 12
      Author(s): Jiaguo Yu


      PubDate: 2018-01-10T10:36:40Z
       
 
 
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