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COMPUTER SCIENCE (1157 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: 13)
Abakós     Open Access   (Followers: 3)
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 69)
ACM Computing Surveys     Hybrid Journal   (Followers: 22)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 9)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 13)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 6)
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: 11)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 13)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 3)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 1)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 20)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 8)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 11)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
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: 26)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 16)
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: 15)
Advances in Computer Science : an International Journal     Open Access   (Followers: 13)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 53)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Human-Computer Interaction     Open Access   (Followers: 20)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access   (Followers: 1)
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)
Air, Soil & Water Research     Open Access   (Followers: 7)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 7)
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: 9)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
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: 2)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 14)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Computer Systems     Open Access   (Followers: 1)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 32)
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)
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: 124)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 6)
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  
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 3)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 9)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Bioinformatics     Hybrid Journal   (Followers: 307)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 46)
British Journal of Educational Technology     Hybrid Journal   (Followers: 124)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 2)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
Cell Communication and Signaling     Open Access   (Followers: 1)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access  
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
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: 12)
Circuits and Systems     Open Access   (Followers: 16)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
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  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Communication Methods and Measures     Hybrid Journal   (Followers: 11)
Communication Theory     Hybrid Journal   (Followers: 20)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 53)
Communications of the Association for Information Systems     Open Access   (Followers: 18)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access  
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: 9)
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: 12)
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: 14)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
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: 13)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 31)
Computer     Full-text available via subscription   (Followers: 84)
Computer Aided Surgery     Hybrid Journal   (Followers: 3)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Communications     Hybrid Journal   (Followers: 10)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 7)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 22)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 10)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 1)
Computer Music Journal     Hybrid Journal   (Followers: 16)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Computer Science - Research and Development     Hybrid Journal   (Followers: 7)
Computer Science and Engineering     Open Access   (Followers: 17)
Computer Science and Information Technology     Open Access   (Followers: 11)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computer Science Journal     Open Access   (Followers: 20)
Computer Science Master Research     Open Access   (Followers: 10)
Computer Science Review     Hybrid Journal   (Followers: 10)

        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  [3044 journals]
  • Preface to the Special Issue of the International Symposium on Single-Atom
           Catalysis (ISSAC-2016)
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Jun Li, Jimmy Liu, Tao Zhang
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Supported metal catalysts at the single-atom limit – A viewpoint
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Maria Flytzani-Stephanopoulos
      An account of recent work on supported single-atom catalyst design is given here for reactions as diverse as the low-temperature water-gas shift, methanol steam reforming, selective ethanol dehydrogenation, and selective hydrogenation of alkynes and dienes. It is of fundamental interest to investigate the intrinsic activity and selectivity of the active metal atom site and compare them to the properties of the corresponding metal nanoparticles and sub-nm clusters. It is also important to understand what constitutes a stable active metal atom site in the various reaction environments, and maximize their loadings to allow us to design robust catalysts for industrial applications. Combined activity and stability studies, ideally following the evolution of the active site as a function of catalyst treatment in real time are recommended. Advanced characterization methods with atomic resolution will play a key role here and will be used to guide the design of new catalysts.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Two-dimensional materials confining single atoms for catalysis
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Yong Wang, Wenhua Zhang, Dehui Deng, Xinhe Bao
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Unravelling single atom catalysis: The surface science approach
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Gareth S. Parkinson
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Aberration-corrected scanning transmission electron microscopy in
           single-atom catalysis: Probing the catalytically active centers
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Jingyue Liu
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Using probe molecule FTIR spectroscopy to identify and characterize
           Pt-group metal based single atom catalysts
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Chithra Asokan, Leo DeRita, Phillip Christopher
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • X-ray absorption spectroscopy for single-atom catalysts: Critical
           importance and persistent challenges
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Isao Ogino
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Increasing the range of non-noble-metal single-atom catalysts
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Ting Deng, Weitao Zheng, Wei Zhang
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Single atom catalyst by atomic layer deposition technique
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Niancai Cheng, Xueliang Sun
      Noble single-atom catalysts have rapidly been attracting attention due to their unique catalytic properties and maximized utilization. Atomic layer deposition (ALD) is an emerging powerful technique for large-scale synthesis of stable single atom. In this review, we summarize recent developments of single atom synthesized by ALD as well as explore future research direction and trends.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Metal-mediated catalysis in the gas phase: A review
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Xiao-Na Li, Xiu-Ping Zou, Sheng-Gui He
      This review summarizes a variety of experimentally identified gas-phase catalytic cycles, all of which are mediated by atomic metal ions, bare metal clusters, metal oxide clusters or metal complexes. Emphasis is placed on the latest advances in the unique catalytic reactivity of cluster-confined single noble metal atoms. The cycles discussed in this paper cover a wide range of inorganic and organic molecules. The use of start-of-the-art mass spectrometric instrumentation in conjunction with quantum chemistry calculations is also reported, as these techniques have determined the mechanistic details of the elementary steps of such catalytic cycles. The important role of gas-phase data in guiding the rational design of better-performing catalysts in related condensed phase reactions is also examined. In particular, this review focuses on the following three topics: (1) the catalytic oxidation of carbon monoxide, (2) the catalytic functionalization of methane, and (3) catalytic decarboxylation.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Preparation, characterization and catalytic performance of single-atom
           catalysts
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Liqiong Wang, Liang Huang, Feng Liang, Simin Liu, Yuhua Wang, Haijun Zhang
      Supported and colloidal single-atom catalysts (SACs), which possess excellent catalytic properties, are particularly important in both fundamental studies and practical applications. The progress made in the preparation methods, characterization, catalytic performances and mechanisms of SACs anchored to metal oxides, two-dimensional materials and the surface of metal nanoclusters (NCs) are reviewed. The different techniques for SAC fabrication, including conventional solution methods based on co-precipitation, incipient wetness co-impregnation, and the chemical vapor deposition method, as well as the newer atom layer deposition (ALD) and galvanic replacement methods, are summarized. The main results from experimental and theoretical studies of various catalytic reactions over SACs, including oxidation reactions, hydrogenation, water gas shift, photocatalytic H2 evolution and electrochemical reactions, are also discussed. Moreover, the electronic properties of the single atoms and their interactions with the supports are described to assist in understanding the origin of the high catalytic activity and selectivity of SACs. Finally, possible future research directions of SACs and their applications are proposed.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Isolation of Pd atoms by Cu for semi-hydrogenation of acetylene: Effects
           of Cu loading
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Guangxian Pei, Xiaoyan Liu, Mengqian Chai, Aiqin Wang, Tao Zhang
      Cu-alloyed Pd single-atom catalysts exhibit excellent catalytic performance for the semi-hydrogenation of acetylene; however, the limit of the Cu/Pd atomic ratio for forming the alloyed Pd single-atom catalyst is ambiguous. Herein, silica-supported Cu–Pd bimetallic catalysts with fixed Pd content and varied Cu loadings were synthesized using an incipient wetness co-impregnation method. The X-ray absorption spectroscopy results indicated that Pd formed an alloy with Cu after reduction at 250 °C and that the Pd atoms were completely isolated by Cu for Cu/Pd atomic ratios ≥ 40/1. Notably, increasing the reduction temperature from 250 to 400 °C hardly affected the catalytic performances of the Cu–Pd/SiO2 catalysts. This finding can be attributed to the similar chemical environments of Pd demonstrated by the X-ray absorption spectroscopy results.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Probing the catalytic behavior of ZnO nanowire supported Pd1 single-atom
           catalyst for selected reactions
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Jia Xu, Yian Song, Honglu Wu, Jingyue Liu
      We have dispersed individual Pd atoms onto ZnO nanowires (NWs) as single-atom catalysts (SACs) and evaluated their catalytic performance for several selected catalytic reactions. The Pd1/ZnO SAC is highly active, stable, and selective towards CO2 for steam reforming of methanol to produce hydrogen. This catalyst system is active for oxidation of CO and H2 but performs poorly for preferential oxidation of CO in hydrogen-rich stream primarily due to the strong competitive oxidation of H2 on ZnO supported Pd1 atoms. At ambient pressure, reverse water-gas-shift reaction occurs on the Pd1/ZnO SAC. This series of tests of catalytic reactions clearly demonstrate the importance of selecting the appropriate metal and support to develop SACs for catalytic transformation of molecules.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Investigation of water adsorption and dissociation on Au1/CeO2 single-atom
           catalysts using density functional theory
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Yan Tang, Yang-Gang Wang, Jin-Xia Liang, Jun Li
      We examined the water adsorption and dissociation on ceria surfaces as well as ceria-supported Au single-atom catalysts using density functional theory calculations. Molecular and dissociative water were observed to coexist on clean CeO2 and reduced Au1/CeO2−x surfaces because of the small difference in adsorption energies, whereas the presence of dissociative water was highly favorable on reduced CeO2−x and clean Au1/CeO2 surfaces. Positively charged Au single atoms on the ceria surface not only provided activation sites for water adsorption but also facilitated water dissociation by weakening the intramolecular O–H bonds. In contrast, negatively charged Au single atoms were not reactive for water adsorption because of the saturation of Au 5d and 6s electron shells. This work provides a fundamental understanding of the interaction between water and single-atom Au catalysts.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Catalytic ativities of single-atom catalysts for CO oxidation: Pt1/FeOx
           vs. Fe1/FeOx
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Jinxia Liang, Xiaofeng Yang, Congqiao Xu, Tao Zhang, Jun Li
      An FeO x -based Pt single-atom catalyst (SAC), Pt1/FeO x , has stimulated significant recent interest owing to its extraordinary activity toward CO oxidation. The concept of SAC has also been successfully extended to other FeO x supported transition metal systems both experimentally and theoretically. However, the FeO x substrate itself (denoted by Fe1/FeO x following the same nomenclature of Pt1/FeO x ) as a typical transition metal oxide possesses a very low catalytic activity toward CO oxidation, although it can be viewed as Fe1/FeO x SAC. Here, to understand the catalytic mechanism of FeO x -based SACs for CO oxidation, we have performed density functional theory calculations on Pt1/FeO x and Fe1/FeO x for CO oxidation to address the differences between these two SACs in terms of the catalytic mechanism of CO oxidation and the chemical behavior of the catalysts. Our calculation results indicated that the catalytic cycle of Fe1/FeO x is much more difficult to accomplish than that of SAC Pt1/FeO x because of a high activation barrier (1.09 eV) for regeneration of the oxygen vacancy formed when the second CO2 molecule desorbs from the surface. Moreover, density of states and Bader charge analysis revealed differences in the catalytic performance for CO oxidation by the SACs Fe1/FeO x and Pt1/FeO x . This work provides insights into the fundamental interactions between the single-atom Pt1 and FeO x substrate, and the exceptional catalytic performance of this system for CO oxidation.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Photochemical route for preparing atomically dispersed Pd1/TiO2 catalysts
           on (001)-exposed anatase nanocrystals and P25
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Pengxin Liu, Jie Chen, Nanfeng Zheng
      Atomically dispersed catalysts have shown promising prospects in catalysis studies. Among all of the developed methods for synthesizing atomically dispersed catalysts, the photochemical approach has recently aroused much attention owing to its simple procedure and mild preparation conditions involved. In the present study, we demonstrate the application of the photochemical method to synthesize atomically dispersed Pd catalysts on (001)-exposed anatase nanocrystals and commercial TiO2 (P25). The as-prepared catalysts exhibit both high activity and stability in the hydrogenation of styrene and catalytic oxidation of CO.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Coating Pd/Al2O3 catalysts with FeOx enhances both activity and
           selectivity in 1,3-butadiene hydrogenation
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Hong Yi, Yujia Xia, Huan Yan, Junling Lu
      Pd-based catalysts are widely used in hydrogenation reactions, and it is essential to improve the selectivity of these catalysts to give the desired products, especially at high conversions. However, improvements in selectivity have generally been achieved at the expense of catalytic activity. Here, we report that deposition of FeO x onto a Pd/Al2O3 catalyst using atomic layer deposition with precise, near atomic control provides a remarkable improvement in both activity and butene selectivity in the selective hydrogenation of 1,3-butadiene under mild conditions. Diffuse reflectance infrared Fourier transform spectroscopy for CO chemisorption measurements illustrate that FeO x preferentially nucleates on Pd (111) facets and divides the Pd surface atoms into small ensembles. X-ray photoelectron spectroscopy measurements revealed that the Pd became electron deficient after FeO x deposition owing to the strong Pd–FeO x interaction. Our results suggest that a geometric effect, that is, the formation of small Pd ensembles, is the main contributor to the improvement in butene selectivity, whereas the enhancement in hydrogenation activity may be attributed to both electronic effects and the newly generated Pd–FeO x interface.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Top-down synthesis strategies: Maximum noble-metal atom efficiency in
           catalytic materials
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Yaxin Chen, Zhiwei Huang, Xiao Gu, Zhen Ma, Jianmin Chen, Xingfu Tang
      Top-down synthesis has been used to prepare catalytic materials with nanometer sizes, but fabricating atomically dispersed metal catalysts remains a challenge because surface single metal atoms are prone to aggregation or coalescence. A top-down strategy is used to synthesize atomically dispersed metal catalysts, based on supported Ag nanoparticles. The changes of the geometric and electronic structures of the Ag atoms during the top-down process are studied using the in situ synchrotron X-ray diffraction technique, ex situ X-ray absorption spectroscopy, and transmission electron microscopy. The experimental results, coupled with the density functional theory calculations, demonstrate that the electronic perturbation of the Ag frontier orbitals, induced by the Ag-O interactions at the perimeter of the metal-support interface, is the driving force of the top-down process. The top-down synthesis has two important functions: to increase the number of catalytic active sites and to facilitate the study of complex reaction mechanisms (e.g., formaldehyde oxidation) by developing single-site model catalysts.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Identification of active sites for hydrogenation over Ru/SBA-15 using in
           situ Fourier-transform infrared spectroscopy
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Hangjia Shen, Xianyuan Wu, Dahao Jiang, Xiaonian Li, Jun Ni
      The active sites for hydrogenation over Ru/SBA-15 catalysts were identified using in situ Fourier-transform infrared spectroscopy. The amount of active sites was proportional to the interfacial circumference of the Ru particles. In contrast, the rate of hydrogen spillover from Ru to the support was inversely proportional to the size of the Ru metal particles. Consequently, a catalyst with small Ru metal particles has a high rate of hydrogen spillover but a low density of active sites, whereas one with large Ru particles has a low rate of hydrogen spillover but a high density of active sites. The formation of these active sites is probably an intermediate step in hydrogen spillover.
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      PubDate: 2017-09-19T22:38:39Z
       
  • Effect of pretreatment conditions on catalytic activity of Ag/SBA-15
           catalyst for toluene oxidation
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Yuan Qin, Zhenping Qu, Cui Dong, Na Huang
      The catalytic oxidation of toluene over Ag/SBA-15 synthesized under different pretreatment conditions, including O2 at 500 °C (denoted O500), H2 at 500 °C (H500), and O2 at 500 °C followed by H2 at 300 °C (O500-H300) was studied. The pretreated samples were investigated by N2 physisorption, X-ray diffraction, and ultraviolet-visible diffuse reflectance. The pretreatment atmosphere greatly influences the status of the Ag and O species, which in turn significantly impacts the adsorption and catalytic removal of toluene. Ag2O and amorphous Ag particles, as well as a large amount of subsurface oxygen species, are formed on O500, and the subsurface oxygen enhances the interaction between Ag species and toluene, so O500 shows good activity at higher temperature. However, its activity at lower temperature is not as high as expected, with a reduced presence of Ag2O and lower adsorption capacity for toluene. H2 pretreatment at 500 °C is conducive to the formation of large Ag particles and yields the largest adsorption capacity for toluene, so H500 exhibits the best activity at lower temperatures; however, because of poor interaction between Ag and toluene, its activity at higher temperature is modest. The O500-H300 sample exhibits excellent catalytic activity during the whole reaction process, which can be attributed to the small and highly dispersed Ag nanoparticles as well as the existence of subsurface oxygen.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Effect of the degree of dispersion of Pt over MgAl2O4 on the catalytic
           hydrogenation of benzaldehyde
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Feng Yan, Caixian Zhao, Lanhua Yi, Jingcai Zhang, Binghui Ge, Tao Zhang, Weizhen Li
      One of the central tasks in the field of heterogeneous catalysis is to establish structure-function relationships for these catalysts, especially for precious metals dispersed on the sub-nanometer scale. Here, we report the preparation of MgAl2O4-supported Pt nanoparticles, amorphous aggregates and single atoms, and evaluate their ability to catalyze the hydrogenation of benzaldehyde. The Pt species were characterized by N2 adsorption, X-ray diffraction (XRD), aberration-corrected transmission electron microscopy (ACTEM), CO chemisorption and in situ Fourier transform infrared spectroscopy of the chemisorbed CO, as well as by inductively coupled plasma atomic emission spectroscopy. They existed as isolated or neighboring single atoms on the MgAl2O4 support, and formed amorphous Pt aggregates and then nanocrystallites with increased Pt loading. On the MgAl2O4 support, single Pt atoms were highly active in the selective catalytic hydrogenation of benzaldehyde to benzyl alcohol. The terrace atoms of the Pt particles were more active but less selective; this was presumably due to their ability to form bridged carbonyl adsorbates. The MgAl2O4-supported single-atom Pt catalyst is a novel catalyst with a high precious atom efficiency and excellent catalytic hydrogenation ability and selectivity.
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      PubDate: 2017-09-19T22:38:39Z
       
  • Mechanistic understanding on oxygen evolution reaction on γ-FeOOH (010)
           under alkaline condition based on DFT computational study
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Miru Tang, Qingfeng Ge
      An efficient and economical oxygen evolution reaction (OER) catalyst is critical to the widespread application of solar energy to fuel conversion. Among many potential OER catalysts, the metal oxyhydroxides, especially FeOOH, show promising OER reactivity. In the present work, we performed a DFT + U study of the OER mechanism on the γ-FeOOH (010) surface. In particular, we established the chemical potential of the OH− and hole pair and included the OH− anion in the reaction pathway, accounting to the alkaline conditions of anodic OER process. We then analyzed the OER pathways on the surface with OH-, O- and Fe-terminations. On the surface with OH- and O- terminations, the O2 molecule could form from either OH reacting with the surface oxygen species (–OH* and –O*) or the combination of two surface oxygen species. On the Fe-terminated surface, O2 can only form by adsorbing OH on the Fe sites first. The potential-limiting step of the oxygen evolution with different surface terminations was determined by following the free-energy change of the elementary steps along each pathway. Our results show that oxygen formation requires recreating the surface Fe sites, and consequently, the condition that favors the partially exposed Fe sites will promote oxygen formation.
      Graphical abstract image

      PubDate: 2017-09-19T22:38:39Z
       
  • Three-dimensionally ordered macroporous CeO2/Al2O3-supported Au
           nanoparticle catalysts: Effects of CeO2 nanolayers on catalytic activity
           in soot oxidation
    • Abstract: Publication date: September 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 9
      Author(s): Baofang Jin, Yuechang Wei, Zhen Zhao, Jian Liu, Yazhao Li, Renjie Li, Aijun Duan, Guiyuan Jiang
      A series of catalysts consisting of three-dimensionally ordered macroporous (3DOM) x-CeO2/Al2O3-supported Au nanoparticles (x = 2, 10, 20, and 40 wt%) were successfully synthesized using a reduction-deposition method. These catalysts were characterized using scanning electron microscopy, the Brunauer-Emmett-Teller method, X-ray diffraction, transmission electron microscopy, ultraviolet-visible spectroscopy, and temperature-programmed reduction by H2. Au nanoparticles of mean particle size 5 nm were well dispersed and supported on the inner walls of uniform macropores. The 3DOM structure improved the contact efficiency between soot and the catalyst. An Al-Ce-O solid solution was formed in the multilayer support, i.e., x-CeO2/Al2O3, by the incorporation of Al3+ ions into the CeO2 lattice, which resulted in the creation of extrinsic oxygen vacancies. Strong interactions between the metal (Au) and the support (Ce) increased the amount of active oxygen species, and this promoted soot oxidation. The catalytic performance in soot combustion was evaluated using a temperature-programmed oxidation technique. The presence of CeO2 nanolayers in the 3DOM Au/x-CeO2/Al2O3 catalysts clearly improved the catalytic activities in soot oxidation. Among the prepared catalysts, 3DOM Au/20%CeO2/Al2O3 showed high catalytic activity and stability in diesel soot oxidation.
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      PubDate: 2017-09-19T22:38:39Z
       
  • Nanoheterostructured photocatalysts for improving photocatalytic hydrogen
           production
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Hong Du, Ya-Nan Liu, Cong-Cong Shen, An-Wu Xu
      Rapid industrialization has accordingly increased the demand for energy. This has resulted in the increasingly severe energy and environmental crises. Hydrogen production, based on the photocatalytic water splitting driven by sunlight, is able to directly convert solar energy into a usable or storable energy resource, which is considered to be an ideal alternative energy source to assist in solving the energy crisis and environmental pollution. Unfortunately, the hydrogen production efficiency of single phase photocatalysts is too low to meet the practical requirements. The construction of heterostructured photocatalyst systems, which are comprised of multiple components or multiple phases, is an efficient method to facilitate the separation of electron-hole pairs to minimize the energy-waste, provide more electrons, enhance their redox ability, and hence improve the photocatalytic activity. We summarize the recent progress in the rational design and fabrication of nanoheterostructured photocatalysts. The heterojunction photocatalytic hydrogen generation systems can be divided into type-I, type-II, pn-junction and Z-scheme junction, according to the differences in the transfer of the photogenerated electrons and holes. Finally, a summary and some of the challenges and prospects for the future development of heterojunction photocatalytic systems are discussed.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Synthesis of graphene/tourmaline/TiO2 composites with enhanced activity
           for photocatalytic degradation of 2-propanol
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Lili Yin, Ming Zhao, Huilin Hu, Jinhua Ye, Defa Wang
      We report the construction of a graphene/tourmaline/TiO2 (G/T/TiO2) composite system with enhanced charge-carrier separation, and therefore enhanced photocatalytic properties, based on tailoring the surface-charged state of graphene and/or by introducing an external electric field arising from tourmaline. A simple two-step hydrothermal method was used to synthesize G/T/TiO2 composites and poly(diallyldimethylammonium chloride)-G/T/TiO2 composites. In the photocatalytic degradation of 2-propanol (IPA), the catalytic activity of the composite containing negatively charged graphene was higher than of the composite containing positively charged graphene. The highest acetone evolution rate (223 μmol/h) was achieved using the ternary composite with the optimum composition, i.e., G0.5/T5/TiO2 (0.5 wt% graphene and 5 wt% tourmaline). The involvement of tourmaline and graphene in the composite is believed to facilitate the separation and transportation of electrons and holes photogenerated in TiO2. This synergetic effect could account for the enhanced photocatalytic activity of the G/T/TiO2 composite. A mechanistic study indicated that O2 •− radicals and holes were the main reactive oxygen species in photocatalytic degradation of IPA.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Confinement effect of carbon nanotubes on the product distribution of
           selective hydrogenation of cinnamaldehyde
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Hongfei Ma, Tie Yu, Xiulian Pan, Xinhe Bao
      The catalytic activity of metal catalysts can be modulated by confinement within the channels of carbon nanotubes (CNTs). Here, we show that the product distribution of cinnamaldehyde hydrogenation can be modified by confinement of Ru nanoparticles in CNTs. A catalyst composed of Ru nanoparticles dispersed on the exterior walls of CNTs gave hydrocinnamaldehyde as product. In contrast, confinement of the Ru nanoparticles within CNT channels facilitated hydrogenation of C=O bonds and complete hydrogenation, and both cinnamyl alcohol and hydrocinnamyl alcohol formed in addition to hydrocinnamaldehyde. High-resolution transmission electron microscopy, Raman spectroscopy, hydrogen temperature-programmed reduction, and hydrogen temperature-programmed desorption were used to investigate the characteristics of the catalysts. The results indicate that the different interactions between the confined Ru nanoparticles and the exterior and interior walls of the CNTs, as well as spatial restriction and enrichment within the narrow channels likely play important roles in modulation of the product distribution.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Catalytic combustion of methane over Pd/SnO2 catalysts
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Zhenyang Zhao, Bowei Wang, Jian Ma, Wangcheng Zhan, Li Wang, Yanglong Guo, Yun Guo, Guanzhong Lu
      SnO2-supported Pd catalysts were prepared and the effects of the support calcination temperature on the subsequent catalytic activity during methane combustion were investigated. The physicochemical properties of the Pd/SnO2 were characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, oxygen temperature-programmed desorption and CH4 temperature-programmed surface reaction. Only crystalline Pd species were found on the catalysts fabricated from the supports calcined above 800 °C. It was also determined that lattice geometry matching between PdO and SnO2 in the catalyst made with a support calcined at 1200 °C facilitated oxygen activation from SnO2 to vacant oxygen sites on the PdO/Pd surface via the back-spillover of oxygen. This effect in turn enhanced the catalytic combustion process. The activity of this material was clearly increased compared with the catalysts that did not exhibit lattice matching between the PdO and support.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Surface titanium oxide loaded on a special alumina as high-performance
           catalyst for reduction of cinnamaldehyde by isopropanol
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Weimeng Cai, Jie Yang, Hongfang Sun, Yibo Wang, Tie Ling, Xuefeng Guo, Luming Peng, Weiping Ding
      A nanocomposite catalyst with a nonstoichiometric titanium oxide loaded on a special nanotubular alumina (γ-Al2O3-nt) was developed and used to reduce cinnamaldehyde to cinnamyl alcohol with sacrificial isopropanol, i.e., a Meerwein-Ponndorf-Verley type reaction. The deposition process produced a highly disperse layer of titanium oxide on the surface of a γ-Al2O3-nt support. After a reduction treatment, the as-prepared TiO x /γ-Al2O3-nt was a highly efficient catalyst for the hydrogen transfer reaction between isopropanol and cinnamaldehyde. Selectivity for cinnamic alcohol was higher than 99% and the conversion of cinnamaldehyde was higher than 95%. The regular morphology of the γ-Al2O3-nt support with homogeneous surface sites and the uniformly dispersed titanium oxide featured a high concentration surface Ti(III) species. These factors contributed to the high performance of the TiO x /γ-Al2O3-nt catalyst.
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      PubDate: 2017-09-02T04:43:15Z
       
  • SiO2-supported Au-Ni bimetallic catalyst for the selective hydrogenation
           of acetylene
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Mengqian Chai, Xiaoyan Liu, Lin Li, Guangxian Pei, Yujing Ren, Yang Su, Hongkui Cheng, Aiqin Wang, Tao Zhang
      Supported Au catalysts have been reported to exhibit high ethylene selectivity in the hydrogenation of acetylene, but the conversion is relatively low. Adding a second metal to Au has proven to be a promising approach to enhance its catalytic performance in acetylene hydrogenation. In this work, SiO2-supported Au-Ni bimetallic catalysts were synthesized and investigated in the selective hydrogenation of acetylene. The Au-Ni bimetallic catalysts exhibited much higher catalytic performance than that of the corresponding monometallic Au or Ni catalysts. By tuning the reduction temperature and/or Ni loading, we obtained an Au-Ni/SiO2 catalyst with optimal performance. The results of transmission electron microscopy imaging revealed that the Au-Ni bimetallic particles were highly dispersed on the SiO2 support. Meanwhile, analysis of the bimetallic catalyst by energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy demonstrated the formation of Au-Ni alloy, which contributed to the synergistic effect between Au and Ni in the hydrogenation of acetylene.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Al-modified mesocellular silica foam as a superior catalyst support for
           dibenzothiophene hydrodesulfurization
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Shaotong Song, Xu Yang, Bo Wang, Xiaofeng Zhou, Aijun Duan, Kebin Chi, Zhen Zhao, Chunming Xu, Zhentao Chen, Jianmei Li
      A series of Al-containing mesostructured cellular silica foams (Al-MCFs) with different Si/Al molar ratios (x; x = 10, 20, 30, 40, or 50) were prepared by a post synthetic method using aluminum isopropoxide as an alumina source. The corresponding NiMo catalysts supported on Al-MCFs were prepared and evaluated using dibenzothiophene (DBT) as the probe reactant. All the synthesized samples were characterized by small-angle X-ray scattering, scanning electron microscopy, nitrogen adsorption-desorption, UV-Vis diffuse reflectance spectroscopy, H2 temperature-programmed reduction, 27Al MAS NMR, temperature-programmed desorption of ammonia, pyridine-FTIR, Raman spectroscopy, HRTEM, and X-ray photoelectron spectroscopy to analyze their physicochemical properties and to gain a deeper insight of the interrelationship between the structures and the catalytic performance. The synthesis mechanism was proposed to involve the formation of Brönsted acid and Lewis acid sites through the replacement of Si4+ with Al3+. Aluminum introduced into MCFs by the post synthetic method has a negligible influence on the mesostructure of the parent MCFs but can form silicoaluminate materials with moderate Brönsted acidity. For Al-MCFs(x) materials, the detection of tetrahedrally coordinated Al3+ cations demonstrated that the Al species had been successfully incorporated into the silicon frameworks. Furthermore, the DBT hydrodesulfurization (HDS) catalytic activity of the NiMo/Al-MCFs(x) catalysts increased with increasing Si/Al molar ratio, and reached a maximum at a Si/Al molar ratio of 20. The interaction of Ni and Mo species with the support became stronger when Al was incorporated into the MCFs supports. The high activities of the NiMo/Al-MCFs catalysts for the DBT HDS were attributed to the suitable acidity properties and good dispersions of the Ni and Mo active phases.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Peroxymonosulfate activation by Mn3O4/metal-organic framework for
           degradation of refractory aqueous organic pollutant rhodamine B
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Longxing Hu, Guihua Deng, Wencong Lu, Yongsheng Lu, Yuyao Zhang
      An environmentally friendly Mn-oxide-supported metal-organic framework (MOF), Mn3O4/ZIF-8, was successfully prepared using a facile solvothermal method, with a formation mechanism proposed. The composite was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron microscopy, and Fourier-transform infrared spectroscopy. After characterization, the MOF was used to activate peroxymonosulfate (PMS) for degradation of the refractory pollutant rhodamine B (RhB) in water. The composite prepared at a 0.5:1 mass ratio of Mn3O4 to ZIF-8 possessed the highest catalytic activity with negligible Mn leaching. The maximum RhB degradation of approximately 98% was achieved at 0.4 g/L 0.5-Mn/ZIF-120, 0.3 g/L PMS, and 10 mg/L initial RhB concentration at a reaction temperature of 23 °C. The RhB degradation followed first-order kinetics and was accelerated with increased 0.5-Mn/ZIF-120 and PMS dosages, decreased initial RhB concentration, and increased reaction temperature. Moreover, quenching tests indicated that •OH was the predominant radical involved in the RhB degradation; the •OH mainly originated from SO4 −• and, hence, PMS. Mn3O4/ZIF-8 also displayed good reusability for RhB degradation in the presence of PMS over five runs, with a RhB degradation efficiency of more than 96% and Mn leaching of less than 5% for each run. Based on these findings, a RhB degradation mechanism was proposed.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Tuning the growth of Cu-MOFs for efficient catalytic hydrolysis of
           carbonyl sulfide
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Lijuan Shen, Gaojie Wang, Xiaoxiao Zheng, Yanning Cao, Yufeng Guo, Ke Lin, Lilong Jiang
      Development of the high activity, promoter-free catalysts for carbonyl sulfide (COS) hydrolysis is important for the efficient utilization of various feedstocks. In this study, the Cu-based metal-organic framework HKUST-1 is synthesized by a simple and mild anodic-dissolution electrochemical method. The physical and chemical properties of the samples are characterized by several techniques, including scanning electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller analysis and X-ray photoelectron spectroscopy. The results reveal that the synthesis voltage plays a crucial role in controlling the morphology of the resulting HKUST-1. The obtained samples function as novel catalysts for the hydrolysis of COS. A high efficiency, approaching 100%, can be achieved for the conversion of COS at 150 °C over the optimal HKUST-1 synthesized at 25 V. This is significantly higher than that of the sample prepared by the traditional hydrothermal method. Additionally, the effects of the water temperature and the flow velocity on the hydrolysis of COS are also investigated in detail. Finally, a possible reaction pathway of COS hydrolysis over HKUST-1 is also proposed. This work represents the first example of MOFs applied to the catalytic hydrolysis of COS. The results presented in this study can be anticipated to give a feasible impetus to design novel catalysts for removing the sulfur-containing compounds.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Zinc phthalocyanine as an efficient catalyst for halogen-free synthesis of
           formamides from amines via carbon dioxide hydrosilylation under mild
           conditions
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Rongchang Luo, Xiaowei Lin, Jing Lu, Xiantai Zhou, Hongbing Ji
      The combination of a zinc phthalocyanine (ZnPc) catalyst and a stoichiometric amount of dimethyl formamide (DMF) provided a simple route to formamide derivatives from amines, CO2, and hydrosilanes under mild conditions. We deduced that formation of an active zinc-hydrogen (Zn-H) species promoted hydride transfer from the hydrosilane to CO2. The cooperative activation of the Lewis acidic ZnPc by strongly polar DMF, led to formation of activated amines and hydrosilanes, which promoted the chemical reduction of CO2. Consequently, the binary ZnPc/DMF catalytic system showed excellent yields and superior chemoselectivity, representing a simple and sustainable pathway for the reductive transformation of CO2 into valuable chemicals as an alternative to conventional halogen-containing process.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Rhodium(III)-catalyzed selective access to isoindolinones via formal [4 +
           1] annulation of arylamides and propargyl alcohols
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Youwei Xu, Fen Wang, Songjie Yu, Xingwei Li
      A mild and efficient oxidative synthesis of isoindolinones has been realized by Rh(III)-catalyzed C–H activation of benzamides and [4 + 1] coupling with propargyl alcohols. This coupling system proceeds with broad substrate scope and mild conditions and provides a new approach to access the useful skeleton of γ-lactams with a stereogenic center.
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      PubDate: 2017-09-02T04:43:15Z
       
  • New insight into hydroxyl-mediated NH3 formation on the Rh-CeO2 catalyst
           surface during catalytic reduction of NO by CO
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Chengxiong Wang, Wenzheng Xia, Yunkun Zhao
      Vibrational IR spectra and light-off investigations show that NH3 forms via the “hydrogen down” reaction of adsorbed CO and NO with hydroxyl groups on a CeO2 support during the catalytic reduction of NO by CO. The presence of water in the reaction stream results in a significant increase in NH3 selectivity. This result is due to water-induced hydroxylation promoting NH3 formation and the competitive adsorption of H2O and NO at the same sites, which inhibits the reactivity of NO reduction by NH3.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Preparation of LaMnO3 for catalytic combustion of vinyl chloride
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Li Wang, Hongkai Xie, Xingdan Wang, Guizhen Zhang, Yanglong Guo, Yun Guo, Guanzhong Lu
      LaMnO3 was prepared by citrate sol-gel, coprecipitation, hard template, and hydrothermal methods, respectively, and its catalytic performance for the combustion of vinyl chloride was investigated. N2 adsorption-desorption, X-ray diffraction (XRD), Raman spectroscopy (Raman), O2 temperature programmed desorption (O2-TPD), H2 temperature programmed surface reaction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the physicochemical properties of the LaMnO3 samples. The preparation methods had obvious effects on the distribution of oxygen and manganese species on the catalyst surface. The reaction followed the suprafacial mechanism; the activity corresponded with the high amount of Mn4+ and adsorbed oxygen species. LaMnO3 prepared by the citrate sol-gel method had the best performance for vinyl chloride combustion with T 90 of 182 °C. The optimal activity was attributed to the improved redox capability of Mn4+/Mn3+. More available adsorbed oxygen and Mn4+ species on the surface were mainly responsible for the remarkable enhancement of the catalytic activity.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Synthesis and characterization of a Pd(0) Schiff base complex anchored on
           magnetic nanoporous MCM-41 as a novel and recyclable catalyst for the
           Suzuki and Heck reactions under green conditions
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Mohsen Nikoorazm, Farshid Ghorbani, Arash Ghorbani-Choghamarani, Zahra Erfani
      A Pd Schiff base complex was immobilized onto the surface of magnetic MCM-41 (Fe3O4@MCM-41@Pd(0)-P2C) as a novel, eco-friendly, and recyclable heterogeneous nanocatalyst and fully characterized by FT-IR, VSM, EDS, transmission electron microscopy, scanning electron microscopy, thermogravimetric analyses, ICP-OES, and X-ray powder diffraction analysis. The Fe3O4@MCM-41@Pd(0)-P2C was investigated as a catalyst for the one-pot Suzuki and Heck reactions in PEG as a green solvent to provide the target products in excellent yields. The main advantages of using this catalyst include a short reaction time, green reaction conditions, a simple experimental procedure, non-use of hazardous organic solvents, low loading of the catalyst, and the ability to use various substrates. More importantly, the catalyst could be easily separated from the reaction mixture with the assistance of an external magnet and could be recovered and reused several times without significant loss of stability and activity.
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      PubDate: 2017-09-02T04:43:15Z
       
  • Support effect of the supported ceria-based catalysts during NH3-SCR
           reaction
    • Abstract: Publication date: August 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 8
      Author(s): Xiaojiang Yao, Li Chen, Tingting Kong, Shimin Ding, Qiong Luo, Fumo Yang
      To investigate how the physicochemical properties and NH3-selective catalytic reduction (NH3-SCR) performance of supported ceria-based catalysts are influenced as a function of support type, a series of CeO2/SiO2, CeO2/γ-Al2O3, CeO2/ZrO2, and CeO2/TiO2 catalysts were prepared. The physicochemical properties were probed by means of X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Teller surface area measurements, X-ray photoelectron spectroscopy, H2-temperature programmed reduction, and NH3-temperature programmed desorption. Furthermore, the supported ceria-based catalysts' catalytic performance and H2O + SO2 tolerance were evaluated by the NH3-SCR model reaction. The results indicate that out of the supported ceria-based catalysts studied, the CeO2/γ-Al2O3 catalyst exhibits the highest catalytic activity as a result of having a high relative Ce3+/Ce4+ ratio, optimum reduction behavior, and the largest total acid site concentration. Finally, the CeO2/γ-Al2O3 catalyst also presents excellent H2O + SO2 tolerance during the NH3-SCR process.
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      PubDate: 2017-09-02T04:43:15Z
       
  • 2016 Impact Factor of Chinese Journal of Catalysis is 2.813
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Can Li, Tao Zhang
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      PubDate: 2017-07-09T09:13:53Z
       
  • Sell a dummy: Adjacent functional group modification strategy for the
           catalytic cleavage of lignin β–O–4 linkage
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Chaofeng Zhang, Feng Wang
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      PubDate: 2017-07-09T09:13:53Z
       
  • Metal–organic-framework-based catalysts for hydrogenation reactions
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Zhijie Chen, Junying Chen, Yingwei Li
      Metal–organic-framework (MOF)-based materials with novel physicochemical properties have emerged as promising catalysts for various hydrogenation reactions. In addition to metal clusters and multifunctional organic ligands, MOF-based catalysts can incorporate other functional species, and thus provide various active sites for hydrogenation processes. The structural properties of the catalysts play significant roles in enhancing the interactions among the reactants, products, and catalytic sites, which can be rationally designed. Because of the synergistic effects between the active sites and the structural properties, MOF-based catalysts can achieve higher activities and selectivities in hydrogenation reactions than can be obtained using traditional heterogeneous catalysts. This review provides an overview of recent developments in MOF-based catalysts in the hydrogenation of alkenes, alkynes, nitroarenes, cinnamaldehyde, furfural, benzene, and other compounds. Strategies for improving the catalytic performances of MOF-based catalysts are discussed as well as the different active sites and structural properties of the catalysts.
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      PubDate: 2017-07-09T09:13:53Z
       
  • Highly dispersed Ni nanoparticles on 3D-mesoporous KIT-6 for CO
           methanation: Effect of promoter species on catalytic performance
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Hong-Xia Cao, Jun Zhang, Cheng-Long Guo, Jingguang G. Chen, Xiang-Kun Ren
      Promoter-modified Ni-based catalysts were synthesized by an incipient-wetness impregnation method using 3D-mesoporous KIT-6 as a support modified by ethylene glycol, and evaluated for the catalytic production of synthetic natural gas (SNG) from CO methanation. Characterization results suggested that the addition of promoter species could remarkably improve the low-temperature catalytic activity for CO methanation, which was due to a large dispersion of Ni nanoparticles, an enhanced interaction between metal and support as well as a confinement effect of 3D-mesopores. Among all catalysts, Ni-V/KIT-6 possessed the best catalytic performance, which was ascribed to the largest H2 uptake of 177.6 μmol/g and Ni dispersion of 26.5%, an intimate interaction with the support from the formation of Si–O–V linkage and an enhanced confinement effect of 3D-mesopores to effectively prevent the growth of Ni nanoparticles and carbon filaments. In consequence, Ni-V/KIT-6 displayed excellent catalytic performance as well as high catalytic stability, which can be regarded as a promising candidate for CO methanation.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • A DFT+U study of the structures and reactivities of polar CeO2(100)
           surfaces
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Su-Hong Zhong, Guanzhong Lu, Xue-Qing Gong
      Density functional theory calculations corrected by on-site Coulomb interactions were carried out to study the structures of polar CeO2(100) surfaces as well as activities during catalytic CO oxidation. The stabilities of various CeO2(100) termination structures are discussed, and calculated energetics are presented. The most stable CeO2(100) surface was obtained by removing half the outermost full layer of oxygen and the surface stability was found to decrease as the exposed oxygen concentration was increased. Assessing the reaction pathways leading to different final products during CO oxidation over the most stable CeO2(100) surface, we determined that the formation of carbonate species competed with CO2 desorption. However, during CO oxidation on the less stable CeO2(100) surfaces having more exposed oxygen, the CO is evidently able to react with surface oxygen, leading to CO2 formation and desorption. The calculation results and electronic analyses reported herein also indicate that the characteristic Ce 4ƒ orbitals are directly involved in determining the surface stabilities and reactivities.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • High-efficiency oxidative esterification of furfural to methylfuroate with
           a non-precious metal Co-N-C/MgO catalyst
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Na Huo, Hong Ma, Xinhong Wang, Tianlong Wang, Gang Wang, Ting Wang, Leilei Hou, Jin Gao, Jie Xu
      From both fundamental and practical perspectives, the production of chemicals from biomass resources using high-efficiency non-precious metal catalysts is important. However, many processes require addition of stoichiometric or excess quantities of base, which leads to high energy consumption, leaching problems, and side reactions. In this study, we investigated the high-efficiency oxidative esterification of furfural to methylfuroate by molecular oxygen with a Co-N-C/MgO catalyst. The catalyst was prepared by direct pyrolysis of a cobalt(II) phenanthroline complex on MgO at 800 °C under N2 atmosphere. From furfural, 93.0% conversion and 98.5% selectivity toward methylfuroate were achieved under 0.5 MPa O2 with reaction at 100 °C for 12 h without a basic additive. The conversion and selectivity were much higher than those obtained with cobalt catalysts produced by pyrolysis of a cobalt(II) phenanthroline complex on activated carbon or typical basic supports, including NaX, NaY, and CaO. X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and experimental results revealed that the high efficiency of Co-N-C/MgO for production of methylfuroate was closely related to the cobalt-nitrogen-doped carbon species and its catalytic ability in hydrogen abstraction. In contrast, Co-N-C(HCl) that synthesized by removing MgO with HCl from Co-N-C/MgO, as the catalyst produced mainly an acetal as a condensation product, and chloride ions had a negative effect on the oxidative esterification. Although the catalytic performance of the cobalt-nitrogen-doped carbon species was greatly affected by HCl treatment, it could be recovered to a great extent by addition of MgO. Moreover, changes in the oxygen pressure hardly affected the oxidative esterification of furfural with Co-N-C/MgO. This study not only provides an effective approach to prepare methylfuroate, but also for designing high-performance non-precious metal catalysts for the oxidative esterification of biomass-derived compounds.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • Catalytic wet oxidation of aniline over Ru catalysts supported on a
           modified TiO2
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Mingguang Song, Yunsong Wang, Yun Guo, Li Wang, Wangcheng Zhan, Yanglong Guo, Guanzhong Lu
      The catalytic wet air oxidation of aniline over Ru catalysts supported on modified TiO2 (TiO2, Ti0.9Ce0.1O2, Ti0.9Zr0.1O2) is investigated. A series of characterization techniques are conducted to determine the relationship between the physico-chemical properties and the catalytic performance. As a result of the good metal dispersion and large number of surface oxygen species, the Ru/Ti0.9Zr0.1O2 catalyst presents the best catalytic activity among the tested samples. The effects of the operating conditions on the reaction are investigated and the optimal reaction conditions are determined. Based on the relationship between the by-products concentration and the reaction time, the reaction path for the catalytic oxidation of aniline is established. Carbonaceous deposits on the surface of the support are known to be the main reason for catalyst deactivation. The catalysts maintain a constant activity even after three consecutive cycles.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • Ni/Al2O3 catalysts derived from spinel NiAl2O4 for low-temperature
           hydrogenation of maleic anhydride to succinic anhydride
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Jie Li, Yuanhang Ren, Bin Yue, Heyong He
      Ni/Al2O3 catalysts were derived from spinel NiAl2O4 with different Ni content ((2.5, 5 and 7.5) wt%). The catalysts were obtained by H2 reduction and were investigated for the low-temperature hydrogenation of maleic anhydride (MA) to produce succinic anhydride (SA). The characterization results showed that Ni0 active sites were mainly derived during the H2 reduction from spinel NiAl2O4. Among the catalysts studied, employing the optimum preparation and reaction conditions with Ni(5%)/Al2O3 yielded the highest catalytic performance. A near-100% conversion of MA and ∼90% selectivity to SA were achieved at 120 °C and 0.5 MPa of H2 with a weighted hourly space velocity (MA) of 2 h−1.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • Enhanced plasmonic photocatalysis by SiO2@Bi microspheres with
           hot-electron transportation channels via Bi–O–Si linkages
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Zilin Ni, Wendong Zhang, Guangming Jiang, Xiaoping Wang, Zhenzhen Lu, Yanjuan Sun, Xinwei Li, Yuxin Zhang, Fan Dong
      The semimetal Bi has received increasing interest as an alternative to noble metals for use in plasmonic photocatalysis. To enhance the photocatalytic efficiency of metallic Bi, Bi microspheres modified by SiO2 nanoparticles were fabricated by a facile method. Bi–O–Si bonds were formed between Bi and SiO2, and acted as a transportation channel for hot electrons. The SiO2@Bi microspheres exhibited an enhanced plasmon-mediated photocatalytic activity for the removal of NO in air under 280 nm light irradiation, as a result of the enlarged specific surface areas and the promotion of electron transfer via the Bi–O–Si bonds. The reaction mechanism of photocatalytic oxidation of NO by SiO2@Bi was revealed with electron spin resonance and in situ diffuse reflectance infrared Fourier transform spectroscopy experiments, and involved the chain reaction NO → NO2 → NO3 − with •OH and •O2 − radicals as the main reactive species. The present work could provide new insights into the in-depth mechanistic understanding of Bi plasmonic photocatalysis and the design of high–performance Bi-based photocatalysts.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • Strong visible absorption and excellent photocatalytic performance of
           brown TiO2 nanoparticles synthesized using one-step low-temperature
           process
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Ting Wang, Wanwen Li, Dandan Xu, Xuanmin Wu, Liwei Cao, Jianxin Meng
      We report a facile and modified sol-gel approach to synthesize brown TiO2 nanoparticles at low temperature (100–600 °C). The TiO2 nanoparticles dried at 180 °C (TiO2-180°C) possessed a small particle size (5.0 nm), large specific surface area (213.45 m2/g), and efficient response to broadband light over the entire ultraviolet-visible spectrum with a narrow band gap of 1.84 eV. In addition, TiO2-180°C exhibited the optimal reaction rate constant for the degradation of methylene blue (0.08287 mg/(L·min)), which is six times higher than that of the mixed rutile/anatase phase TiO2 photocatalytic standard P25 (0.01342 mg/(L·min)). Furthermore, cycling photodegradation experiments confirmed the stability and reusability of this catalyst. The unique physicochemical properties resulting from the low-temperature preparation of TiO2-180°C, including its broadband visible absorption associated with a high concentration of oxygen vacancies, large surface area, and enriched surface –OH/H2O may be responsible for this excellent photocatalytic performance. The use of as-prepared TiO2-180°C for practical applications is expected after further optimization.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
  • Fabrication of a highly dispersed Pdcore@Ptshell electrocatalyst for the
           oxygen reduction reaction
    • Abstract: Publication date: July 2017
      Source:Chinese Journal of Catalysis, Volume 38, Issue 7
      Author(s): Longsheng Cao, Shangfeng Jiang, Geng Zhang, Xuejun Tang, Xiaoping Qin, Zhigang Shao, Baolian Yi
      Core-shell nanostructures have been widely investigated to improve the electrocatalytic performance of platinum. However, organic precursors, surfactants or high temperature are usually necessary during the preparation procedure. Unfortunately, these requirements limit the application of these methods on a large scale. Herein, a Pdcore@Ptshell nanostructure was fabricated through the reduction of K2PtCl4 by dissociated hydrogen at room temperature without the assistance of either a surfactant or a high-boiling point solvent. The shell thickness of this nanostructure was successfully controlled by varying the amount of K2PtCl4; core-shell nanoparticles with a shell thickness of 0.45, 0.75 and 0.90 nm were obtained, as determined by TEM. The remarkable crystallinity and epitaxial growth of the Pdcore@Ptshell nanostructure were revealed by HRTEM and EDS. According to ICP and XPS, surface segregation of Pt was established. The impressive ORR performance was attributed to the weak adsorption strength of the OHads species, which resulted from the electron transfer impact between the Pdcore and Ptshell. The facile and clean preparation method can be used to prepare other core-shell nanostructures under a mild atmosphere.
      Graphical abstract image

      PubDate: 2017-07-09T09:13:53Z
       
 
 
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