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ENGINEERING (1248 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 20)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 275)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 5)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 26)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 276)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 212)
Composites Part B : Engineering     Hybrid Journal   (Followers: 247)
Composites Science and Technology     Hybrid Journal   (Followers: 187)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)

        1 2 3 4 5 6 7 | Last

Journal Cover Applied Catalysis A: General
  [SJR: 1.234]   [H-I: 159]   [6 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0926-860X
   Published by Elsevier Homepage  [3175 journals]
  • MFI zeolite coating with intrazeolitic aluminum (acidic) gradient
           supported on SiC foams to improve the methanol-to-propylene (MTP) reaction
    • Authors: Yilai Jiao; Shaojun Xu; Chunhai Jiang; Michal Perdjon; Xiaolei Fan; Jinsong Zhang
      Pages: 1 - 9
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Yilai Jiao, Shaojun Xu, Chunhai Jiang, Michal Perdjon, Xiaolei Fan, Jinsong Zhang
      To hinder the deactivation and improve the propylene selectivity in the methanol-to-propylene (MTP) reaction, MFI coating with the intrazeolitic aluminum (acidic) gradient supported on SiC foam support (G-MFI/SiC foam) was proposed. The solid polycrystalline silicon was used in the synthesis of G-MFI/SiC foam catalyst provided a prolonged release of silica nutrient in the liquid phase and suppressed the precipitation phenomena. The resulting MFI coating showed the aluminum gradient along the surface normal direction of SiC foams with ZSM-5 layer (about 20 μm) near the SiC surface followed by the silicalite-1 layer (about 10 μm). The alumina (acidic) gradient in the MFI coating renders a passive outer layer of silicalite-1 with fairly large amount of weak and medium acid sites prevented the coke formation as well as promoted the selectivity to propylene in the MTP reaction. Compared to the conventional ZSM-5/SiC foam catalyst, the G-MFI/SiC foam catalyst showed excellent performance in the MTP reaction with good catalytic longevity (8 h vs. 76 h for >95% methanol conversion) and low coke deposition (6.7 × 10−3 wt.% h−1 vs. 0.26 wt.% h−1), as well as high propylene selectivity (ca. 36% vs. 46%).
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.006
      Issue No: Vol. 559 (2018)
  • Screening of Ni-Cu bimetallic catalysts for hydrogen and carbon
           nanofilaments production via catalytic decomposition of methane
    • Authors: D. Torres; J.L. Pinilla; I. Suelves
      Pages: 10 - 19
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): D. Torres, J.L. Pinilla, I. Suelves
      The catalytic decomposition of methane (CDM) is a H2 production process in which the CO2 emission of conventional processes is avoided and from which carbon nanofilaments can be obtained as a high added value by-product. In this work, we present a thermogravimetry-based screening of catalysts according to their carbon production in the CDM reaction. Catalysts studied were based on Ni as active phase, using two textural promoters (Al2O3 or MgO) and Cu as dopant element in different proportions: 2.5, 5.0, 7.5 and 10 mol %. Cu doping resulted in an increase in both the maximum temperature of activity (>100 °C) and the carbon formation rate, which were maximum for a Cu content of 7.5 mol %, regardless of the textural promoter used. The formation of a solid solution of Ni(x)Cu(1-x), with lattice constants and particle size distribution highly dependent on the Cu content, led to the formation of fishbone carbon nanofibers with different morphological features, such as the α angle between the graphene stacks and the growth axis of the nanofilament, the diameter, the length and the formation or not of an inner hollow.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.011
      Issue No: Vol. 559 (2018)
  • Liquid phase hydrodeoxygenation of anisole, 4-ethylphenol and benzofuran
           using Ni, Ru and Pd supported on USY zeolite
    • Authors: David P. Gamliel; Stavros Karakalos; Julia A. Valla
      Pages: 20 - 29
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): David P. Gamliel, Stavros Karakalos, Julia A. Valla
      The objective of this work is to understand the role of metals on the hydrodeoxygenation (HDO) reaction pathways of three bio-oil model compounds. Ni, Ru and Pd were impregnated on USY zeolite, and the catalysts were characterized to determine metal reduction profile, surface concentration and nanoparticle size. Ru-USY and Pd-USY were completely reduced at a temperature below 450 °C, but Ni-USY still contained surface metal oxides after reduction. There was no indication of strong interactions between the metals and USY support. Anisole, 4-ethylphenol and benzofuran were used as bio-oil model compounds, in order to determine the effects of each metal on deoxygenation of methoxy-, phenol and furan functional groups, respectively. Pd-USY was the most effective HDO catalyst, exhibiting the highest turnover frequency for HDO of all three model compounds, in addition to and high selectivity to deoxygenated products. A mechanism was proposed for each model compound, and the kinetics of hydrogenation, dehydration, CC coupling and ring-opening reactions were determined.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.004
      Issue No: Vol. 559 (2018)
  • Synthesis of hierarchically structured alumina support with adjustable
           nanocrystalline aggregation towards efficient hydrodesulfurization
    • Authors: Yunyun Dong; Yingrui Xu; Yuqi Zhang; Xinyi Lian; Xiaodong Yi; Yao Zhou; Weiping Fang
      Pages: 30 - 39
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Yunyun Dong, Yingrui Xu, Yuqi Zhang, Xinyi Lian, Xiaodong Yi, Yao Zhou, Weiping Fang
      The development of highly active hydrodesulfurization (HDS) catalysts is still of great importance in hydroprocessing of the heavy residue oils in industry. Herein, hierarchically structured alumina hollow microspheres with high specific surface area were successfully prepared via a citric-acid-modulated hydrothermal method. With different dosages of citric acid applied, alumina microspheres were assembled with different specific surface areas, pore volumes and acidity. After the loading of the MoNi active components, a series of HDS catalysts were characterized systematically by various relevant techniques; and their catalytic activity and selectivity towards hydrodesulfurization of dibenzothiophene (DBT) were evaluated and compared. It is revealed that, the catalytic efficiency of the catalyst highly depends on the factors including the specific surface area and the acidity, the sulfidity and the dispersion of the active metal components. On this basis, we have established a facile method for preparation of hierarchically structured alumina supports with desirable physicochemical properties and high HDS catalytic efficiency. This work could also provide theoretical guidance for rational design of highly active HDS catalysts.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.007
      Issue No: Vol. 559 (2018)
  • A highly moisture-resistant binary M3Co16Ox composite oxide catalysts
           wrapped by polymer nanofilm for effective low temperature CO oxidation
    • Authors: Yan Zhou; Jun Yu; Dongsen Mao; Haifang Mao; Xiaoming Guo; Chao Sun; Houjin Huang
      Pages: 40 - 46
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Yan Zhou, Jun Yu, Dongsen Mao, Haifang Mao, Xiaoming Guo, Chao Sun, Houjin Huang
      A series of M3Co16Ox (M = Cr, Ti, Zr, Fe, Mn) oxide catalysts wrapped by polymer nanofilm were developed by the solid-phase method, and the catalytic activities were investigated for low temperature oxidation of carbon monoxide under moisture-rich condition. The catalysts were characterized by HR-TEM, FT-IR, XRD, N2 adsorption-desorption, H2-TPR, CO-TPD and XPS techniques. The results reveal that the M3Co16Ox composite oxides are high-dispersive mesoporous materials coated by polymer nanofilm with an average thickness in the scope of 4–7 nm. The percentages of surface oxygen vacancy and lattice oxygen on the catalysts decrease in the following order: Mn3Co16Ox > Fe3Co16Ox > Zr3Co16Ox > Ti3Co16Ox > Cr3Co16Ox, which is consistent with their catalytic performances. Among all the prepared catalysts, the polymer nanofilm wrapped Mn3Co16Ox nanoparticles possess the highest Co3+/Co2+ ratio (1.56), the highest percentage of surface oxygen vacancy (17.5%) and lattice oxygen (62.2%), resulting in the best catalytic activity, such as, 100% conversion at 55 °C under moisture-rich condition (∼0.6 vol.%). Moreover, the Mn3Co16Ox catalyst also exhibits long-term catalytic stability (>one month) even at a very high water vapor level (3.1 vol.%) and considerably low temperature (85 °C).
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.010
      Issue No: Vol. 559 (2018)
  • Advanced synthesis strategies of mesoporous SBA-15 supported catalysts for
           catalytic reforming applications: A state-of-the-art review
    • Authors: Sharanjit Singh; Ravinder Kumar; Herma Dina Setiabudi; Sonil Nanda; Dai-Viet N. Vo
      Pages: 57 - 74
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Sharanjit Singh, Ravinder Kumar, Herma Dina Setiabudi, Sonil Nanda, Dai-Viet N. Vo
      Catalytic deactivation due to agglomeration and metal particle growth has motivated the researchers around the globe to encapsulate the active metal particles into protective shells of mesoporous support. This strategy of encapsulation has emerged as a powerful tool to restrict particle growth thereby improving the catalytic performance, owing to higher accessibility for active sites. In the past decade, various hierarchical mesoporous scaffolds with multiple porosities integrated into single structure have been synthesized by considering prototypical SBA-15 support. In this regard, we review the recent developments for designing the SBA-15 support and strategies for encapsulating the metals on to porous inorganic protective shells. An overview of the conventional synthesis techniques, progress and strategies for improving the metal incorporation into these pore channels and its impact on dispersion as well as catalytic properties of SBA-15 supported catalyst are extensively reviewed. Furthermore, a perspective on the challenges and opportunities for resolving the issue of sintering under harsh reforming conditions is substantiated.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.015
      Issue No: Vol. 559 (2018)
  • Electrocatalytic removal of humic acid using cobalt-modified particle
    • Authors: Wenwen Zhang; Di Xie; Xue Li; Wenjian Ye; Xiaoxue Jiang; Yuanyuan Wang; Wenyan Liang
      Pages: 75 - 84
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Wenwen Zhang, Di Xie, Xue Li, Wenjian Ye, Xiaoxue Jiang, Yuanyuan Wang, Wenyan Liang
      Humic acid (HA) is a complex polymer compound with no definite chemical formula. It seriously affects water quality and is one of the main precursors of producing disinfection by-products. In the present study, column granular electrodes (Φ×H = 4 × 3 mm) were prepared using cobalt loaded powder active carbon (PAC). The electrodes were applied in a continuous three-dimensional (3D) electrochemical reactor to remove HA. The crystal structure, morphology, surface chemical bonds, and pore structure of as-prepared material were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorption-desorption isotherms. Furthermore, parameters affecting the removal of HA and energy consumption (namely, current, electrolyte type and concentration, and initial pH) were examined. Intermediate products were analyzed using ultraviolet-visible (UV–vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and three-dimensional excitation emission matrix (3DEEM) fluorescence spectroscopy. The results showed that CoO was well loaded in the PAC carriers. The CoO loaded granular electrodes (GAC-Co) had the surface area of 782.6 m2/g, pore volume of 0.6709 cm3/g, and average pore diameter of 3.429 nm. The 95.3% of chemical oxygen demand (COD) removal was obtained under the current of 0.3 A, hydraulic retention time (HRT) of 8 min, influent pH of 7.0, electrolyte of 0.01 mol/L Na2SO4, and initial concentration of 200 mg/L. A large number of H∙ radicals were involved in the electrochemical processes, which were observed using electron spin resonance (ESR) spectroscopy. The analysis of intermediate products indicated that the GAC-Co electrodes showed high electrocatalytic activity for the degradation of HA, in which HA with large molecular weight was decomposed to small molecular weight in the 3D electrochemical system.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.012
      Issue No: Vol. 559 (2018)
  • Direct dehydrogenation of propane to propylene on surface-oxidized
           multiwall carbon nanotubes
    • Authors: Zhong-Pan Hu; Chong Chen; Jin-Tao Ren; Zhong-Yong Yuan
      Pages: 85 - 93
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Zhong-Pan Hu, Chong Chen, Jin-Tao Ren, Zhong-Yong Yuan
      Nanocarbon is an important metal-free catalyst for various applications including oxidative dehydrogenation and direct dehydrogenation reactions. The surface oxygen-containing groups of nanocarbon are regarded as active sites in oxidative dehydrogenation reaction. However, the active sites for direct dehydrogenation are still not totally clear. Herein, multiwall carbon nanotubes (MWCNTs) are activated by different oxidation processes and thermal treatments, and used as effective catalysts for direct dehydrogenation of propane to propylene. The physicochemical properties of the oxidized MWCNTs are characterized by SEM, TEM, XRD, N2 sorption, Raman, TGA, TPD-MS and XPS techniques. It is revealed that the concentrations of the oxygen-containing groups could be well controlled by sequential acid oxidation and thermal treatment. The activities of these nanocarbon catalysts exhibit a good linear dependence on the number of carbonyl/quinone groups, confirming the active sites are CO groups on the surface of the MWCNTs.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.017
      Issue No: Vol. 559 (2018)
  • Enhancement of the NH3-SCR catalytic activity of MnTiOx catalyst by the
           introduction of Sb
    • Authors: Rui-tang Guo; Xiao Sun; Jian Liu; Wei-guo Pan; Ming-yuan Li; Shu-ming Liu; Peng Sun; Shuai-wei Liu
      Pages: 1 - 8
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Rui-tang Guo, Xiao Sun, Jian Liu, Wei-guo Pan, Ming-yuan Li, Shu-ming Liu, Peng Sun, Shuai-wei Liu
      Sb was used as the additive to enhance the NH3-SCR performance of MnTiOx catalyst. Experimental results revealed that MnSbTiOx-0.2 demonstrated outstanding NH3-SCR activity in a wide temperature window (100–400 ℃) and high resistance to SO2. Characterization results indicated the introduction of Sb into MnTiOx catalyst could improve the dispersity of active species and generate more surface acid sites, Mn4+ and surface adsorbed oxygen species. In situ DRIFT spectra proved that the presence of Sb in MnSbTiOx-0.2 catalyst could form new Brønsted acid sites, along with the increased surface Lewis acidity. The improved adsorption of NH3 and NOx species over MnSbTiOx-0.2 catalyst had a stimulating effect on the NH3-SCR reaction over it through Langmuir−Hinshelwood (L-H) route. Moreover, Sb species in MnSbTiOx-0.2 could improve the reactivities of ad-NH3 and ad-NOx species in SCR reaction. All these factors contributed to the excellent performance of MnSbTiOx-0.2 catalyst.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.028
      Issue No: Vol. 558 (2018)
  • Sustainable photocatalytic activities of visible-light sensitive N-doped
           TiO2 microspheres with permeable silica shells
    • Authors: Hyuk Joon Jung; So-Hwang Kye; Hyeo Ji Kang; Hee Jung Yang; Jung Bo Yoo; Kyu Hyung Lee; Nam Hwi Hur
      Pages: 9 - 17
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Hyuk Joon Jung, So-Hwang Kye, Hyeo Ji Kang, Hee Jung Yang, Jung Bo Yoo, Kyu Hyung Lee, Nam Hwi Hur
      In synthetic TiO2, anatase to rutile transformation usually occurs at a temperature over 550 °C. Here, we report a silica-protection method that can extend the phase transformation temperature to 800 °C. This approach involves the deposition of silica shells on TiO2 microspheres and subsequent calcination in either air or ammonia, yielding core-shell microspheres. Nitridation of the silica-coated TiO2 using ammonia gas transformed the amorphous TiO2 core into crystalline N-doped TiO2 (TiO2-xNx), while rendering the silica shell mesoporous. The anatase TiO2-xNx phase could be retained at 800 °C due to the silica shell. The nitrided microspheres with anatase phase exhibited excellent photocatalytic activities for the degradation of organic pollutants and high photoelectrochemical performance in producing photocurrents under visible-light irradiation. Moreover, the nitrided anatase TiO2-xNx retained its high photocatalytic activities even after one and half years of exposure to air. Thus, the silica-protection method is a simple and effective strategy for the synthesis of high-temperature stable N-doped anatase TiO2 photocatalysts with sustainable photocatalytic activities.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.009
      Issue No: Vol. 558 (2018)
  • Dehydration of D-xylose into furfural over bimetallic salts of
           heteropolyacid in DMSO/H2O mixture
    • Authors: Xiaoqian Guo; Feng Guo; Yishan Li; Zhangqin Zheng; Zhexu Xing; Zihan Zhu; Ting Liu; Xin Zhang; Ying Jin
      Pages: 18 - 25
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Xiaoqian Guo, Feng Guo, Yishan Li, Zhangqin Zheng, Zhexu Xing, Zihan Zhu, Ting Liu, Xin Zhang, Ying Jin
      Dehydration of D-xylose to yield furfural was carried out using bimetallic salts of a heteropolyacid as the catalyst at 160–220 °C in the DMSO/H2O mixtures. The effect of Sn/Cs molar ratio of the bimetallic salts of 12-tungstophosphoric acid (PW) obtained by ultrasound-assisted coprecipitation on dehydration of D-xylose was investigated. The resultant catalysts were characterized by X-ray diffraction, N2 adsorption, field emission scanning electron microscopy and energy dispersive X-ray (EDX). It was found that the Sn-Cs codoped PW catalysts retained the Keggin crystal structure of PW. Sn0.625Cs0.5PW was the most active catalyst in the dehydration of D-xylose into furfural. The maximum D-xylose conversion (close to 100 wt %) and furfural yield (63 wt %) were achieved at 200 °C for 3 h in DMSO/H2O mixtures. It was found that 16.7 wt % Sn0.625Cs0.5PW on a chitosan-derived support displayed similar catalytic activity to that of Sn0.625Cs0.5PW and good stability after recycling six times.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.027
      Issue No: Vol. 558 (2018)
  • Promotional synergistic effect of Sn doping into a novel bimetallic Sn-W
           oxides/graphene catalyst for selective oxidation of alcohols using aqueous
           H2O2 without additives
    • Authors: Cai Xu; Lingling Zhang; Yu An; Xiaozhong Wang; Gang Xu; Yingqi Chen; Liyan Dai
      Pages: 26 - 33
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Cai Xu, Lingling Zhang, Yu An, Xiaozhong Wang, Gang Xu, Yingqi Chen, Liyan Dai
      A series of novel catalysts with bimetallic Sn-W oxides uniformly dispersed on reduced graphene oxide (denoted as Sn-W/RGO) were successfully prepared via a conventional one-pot hydrothermal method. Interestingly, it was found that the introduction of Sn could significantly improve the catalytic activities compared with single WO3/graphene catalyst for selective oxidation of alcohols using H2O2 without organic solvents and additives. Subsequently, the catalysts were characterized by FT-IR, XRD, Raman, FESEM, EDS, HRTEM, XPS and N2 adsorption-desorption to investigate the promotional synergistic effect of Sn among catalyst structure, surface properties and catalytic performance. The results revealed that the incorporation of Sn had induced the formation of hexagonal WO3 with dominant exposed (001) and (200) planes, meanwhile, doping Sn could dramatically increase the specific surface area, change the structural properties and enhance the interactions between Sn-W oxides and graphene, which were beneficial to the improvement of catalytic performance. Additionally, reaction parameters (temperature, time, oxidant dosage and catalyst amount) were also explored. Both aryl and alkyl alcohols exhibited high conversion and selectivity to corresponding target products over the catalyst. And delightedly, the robust catalyst could be reused for five times without significant loss in catalytic efficiency. This work demonstrates the promotional synergistic effect of Sn in a novel Sn-doped WO3/RGO catalyst and makes it a promising candidate in green oxidation of alcohols under mild reaction conditions.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.017
      Issue No: Vol. 558 (2018)
  • Continuous flow catalytic partial hydrogenation of hydrocarbons and
           alcohols over hybrid Pd/ZrO2/PVA wall reactors
    • Authors: Carmen Moreno-Marrodan; Francesca Liguori; Pierluigi Barbaro; Haruo Sawa
      Pages: 34 - 43
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Carmen Moreno-Marrodan, Francesca Liguori, Pierluigi Barbaro, Haruo Sawa
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.025
      Issue No: Vol. 558 (2018)
  • CO2 methanation over Fe- and Mn-promoted co-precipitated Ni-Al catalysts:
           Synthesis, characterization and catalysis study
    • Authors: Thomas Burger; Franz Koschany; Oliver Thomys; Klaus Köhler; Olaf Hinrichsen
      Pages: 44 - 54
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Thomas Burger, Franz Koschany, Oliver Thomys, Klaus Köhler, Olaf Hinrichsen
      The methanation reaction of CO2 is in discussion to be a sustainable pathway to address future questions arising from limited primary energy feedstock and the accumulation of CO2 in the atmosphere. Therefore, the development of highly active and thermostable catalysts for this reaction is an indispensable matter of research. For this reason, an equimolar NiAlOx benchmark catalyst (44 wt.% Ni loading) was synthesized and modified by doping with Fe or Mn up to 10 wt.% of promoter by co-precipitation at constant pH 9. Their activity and stability performances in the CO2 methanation reaction were evaluated by comparing the conversion versus temperature characteristics before and after an aging period of 32 h at 500 °C. Material characterization studies comprising BET, XRD, in situ IR spectroscopy, XPS, H2 and CO2 chemisorption, and EPR/FMR contributed to derive structure-activity relationships and to obtain a deeper understanding of the catalytic behavior. Promotion with Mn led to a significant enhancement of the catalytic activity. This is assumed to be caused by a higher density of medium basic sites and an enhanced CO2 adsorption capacity on the activated catalyst related to interactions between Mn oxide species and the mixed oxide phase, in combination with a stabilization of the Ni surface area at moderate Mn loadings. Promotion with Fe increased the thermal stability of the catalyst, which is attributed to the formation of a Ni-Fe alloy during catalyst activation. For both phenomena, the optimum molar Ni to promoter ratio for co-precipitated catalysts was found to be around 5.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.021
      Issue No: Vol. 558 (2018)
  • Effect of CO2 in the oxidative dehydrogenation reaction of propane over
           Cr/ZrO2 catalysts
    • Authors: João F.S. de Oliveira; Diogo P. Volanti; José M.C. Bueno; Adriana P. Ferreira
      Pages: 55 - 66
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): João F.S. de Oliveira, Diogo P. Volanti, José M.C. Bueno, Adriana P. Ferreira
      Investigation was made on the effect of chromium content, and method of hydrothermal preparation of Cr/ZrO2 catalysts on their catalytic properties for CO2 oxidative dehydrogenation of propane (ODP). The catalysts were characterized by nitrogen physisorption, X-ray diffraction, Raman spectroscopy, and temperature programmed reduction and desorption of CO2 (TPD-CO2). The Cr/ZrO2 catalysts containing various chromium contents between 2.5 and 15 wt.% of Cr were prepared by conventional and microwave-assisted hydrothermal methods. Tetragonal ZrO2 was formed, with higher Cr contents, and smaller crystallite sizes obtained using the microwave-assisted method. The relationship between selectivity to propene and propane conversion suggested that independent of the preparation method, the catalytic properties could be classified in two groups, with low and high chromium contents. The TPD-CO2 results showed that a fraction of the CO2 was desorbed at temperatures higher than 500 °C, with simultaneous reduction of Cr(VI) species. The presence of CO2 in the reactants caused strong decreases of activity, selectivity, and yield towards propene. These results suggested that CO2 adsorbed strongly on the chromium oxide active sites for dehydrogenation of propane. The Cr/ZrO2 catalysts were active and selective for dehydrogenation of propane in the absence of CO2 (CDP), and became deactivated with time on stream. The activity was reestablished by thermal treatment with CO2 or O2 after deactivation in CDP catalytic cycles, with the activity always being reestablished by treatment in O2. The deactivation occurred by reduction of Cr(VI) species and by deposition of carbonaceous species produced in oligomerization reactions.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.020
      Issue No: Vol. 558 (2018)
  • Impact of the presence of Mo carbide species prepared ex situ in Mo/HZSM-5
           on the catalytic properties in methane aromatization
    • Authors: Mustafizur Rahman; Apoorva Sridhar; Sheima J. Khatib
      Pages: 67 - 80
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Mustafizur Rahman, Apoorva Sridhar, Sheima J. Khatib
      The catalytic activity of HZSM-5 supported Mo-oxide (MoOx) and Mo-carbide (MoCy) for methane aromatization was studied using a packed-bed microreactor. MoOx/HZSM-5 catalysts with 3, 6, 10, and 12 wt.% Mo loading were prepared by incipient wetness impregnation method followed by calcination at 500 °C. The MoCy/HZSM-5 catalysts were prepared ex situ by treating the oxide catalysts by temperature-programmed reduction and carburization. The MoCy/HZSM-5 catalysts show significantly higher activities and stability compared to those of the MoOx/HZSM-5 catalysts. Unlike the oxide catalysts, not only methane conversion and benzene yield improve with higher Mo loading but also the deactivation rate becomes much slower for the carbide catalysts. The optimum carbide catalyst has a Mo loading of 10 wt% The catalysts were characterized by XRD, N2 adsorption, TPR, NH3-TPD, TPO,TGA and 27Al-NMR. The results show that the oxide catalysts at a high loading face pore blockage after few hours of reaction, which makes the active sites inaccessible to CH4. Carbide catalysts, on the other hand face no pore blockage even after a long period of reaction, making them much better catalysts than the oxides for nonoxidative methane aromatization reaction.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.023
      Issue No: Vol. 558 (2018)
  • Photocatalytic and photochemical processes on the surface of
           uranyl-modified oxides: An in situ XPS study
    • Authors: T.N. Filippov; D.A. Svintsitskiy; I.A. Chetyrin; I.P. Prosvirin; D.S. Selishchev; D.V. Kozlov
      Pages: 81 - 90
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): T.N. Filippov, D.A. Svintsitskiy, I.A. Chetyrin, I.P. Prosvirin, D.S. Selishchev, D.V. Kozlov
      The development of photocatalysts active under visible light attracts great attention due to the prospect for the utilization of solar radiation. The modification of porous supports with uranyl ions results in the ability for oxidation of organic compounds under visible light up to 500 nm in wavelength. In this study, the titania, alumina, and silica were modified with 5 wt.% of uranyl nitrate using the impregnation method and tested in the oxidation of acetone vapor under visible light (450 nm) in a continuous-flow setup. The catalyst based on TiO2 revealed a substantially higher activity compared to other oxides. X-ray photoelectron spectroscopy was employed to elucidate the processes occurring on the surface of uranyl-modified catalysts and explain the effect of support on the photocatalytic activity. New data about the uranium transformations on the surface of titania, alumina, and silica under X-rays and visible light were received using the XPS method. On the Al2O3 and SiO2 surfaces, the uranium was slowly reduced from U6+ to the U5+ but a faster reduction to the U4+ state was observed on the TiO2 surface. The conclusion about the influence of uranium lability on the different surfaces on the photocatalytic activity under visible light is made.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.015
      Issue No: Vol. 558 (2018)
  • Multicomponent Au/Cu-ZnO-Al2O3 catalysts: Robust materials for clean
           hydrogen production
    • Authors: J.L. Santos; T.R. Reina; I. Ivanov; A. Penkova; S. Ivanova; T. Tabakova; M.A. Centeno; V. Idakiev; J.A. Odriozola
      Pages: 91 - 98
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): J.L. Santos, T.R. Reina, I. Ivanov, A. Penkova, S. Ivanova, T. Tabakova, M.A. Centeno, V. Idakiev, J.A. Odriozola
      Clean hydrogen production via WGS is a key step in the development of hydrogen fuel processors. Herein, we have designed a new family of highly effective catalysts for low-temperature WGS reaction based on gold modified copper-zinc mixed oxides. Their performance was controlled by catalysts’ composition and the Au-Cu synergy. The utilization of hydrotalcite precursors leads to an optimal microstructure that ensures excellent Au and Cu dispersion and favors their strong interaction. From the application perspective these materials succeed to overcome the major drawback of the commercial WGS catalysts: resistance towards start/stop operations, a mandatory requisite for H2-powered mobile devices.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.002
      Issue No: Vol. 558 (2018)
  • Essential role of organic additives in preparation of efficient Ni/KIT-6
           catalysts for CO methanation
    • Authors: Yuhao Lv; Zhong Xin; Xin Meng; Miao Tao; Zhicheng Bian; Jia Gu; Wenli Gao
      Pages: 99 - 108
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Yuhao Lv, Zhong Xin, Xin Meng, Miao Tao, Zhicheng Bian, Jia Gu, Wenli Gao
      The introduction of organic additives rich in OH groups, such as citric acid, glucose and d-sorbitol, in nickel nitrate impregnation solutions is an efficient way to minify the size of NiO particles. The organic additives promote the wettability of the impregnation solution during solvent evaporation with increasing viscosity continuously, rather than act as ligands to Ni2+. This let Ni species are loaded into the micropores of support KIT-6, which can hinder the aggregation of Ni particles under severe conditions, e.g. thermal treatment at 650 °C. These organic additives can insulate the blocks of Ni species from each other during combustion without affecting their reducibility significantly, and result in a fairly high Ni dispersion. This kind of Ni-based catalysts possess excellent CO methanation catalytic performance: high CH4 selectivity (ca. 96% at 350 °C), great thermostability and long-term stability.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.029
      Issue No: Vol. 558 (2018)
  • Hydrotreating of guaiacol: A comparative study of Red mud-supported nickel
           and commercial Ni/SiO2-Al2O3 catalysts
    • Authors: Hossein Jahromi; Foster A. Agblevor
      Pages: 109 - 121
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Hossein Jahromi, Foster A. Agblevor
      Upgrading of bio-oil through catalytic hydrotreating was investigated with guaiacol as a model compound. A nickel supported on red mud (Ni/RM) hydrotreating catalyst was developed and compared to the standard Ni/SiO2-Al2O3 catalysts under similar experimental conditions. The Ni/RM catalyst was characterized by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), BET specific surface area, and temperature programmed reduction (TPR). The effects of reaction temperature (300, 350, 400 °C) and initial hydrogen pressure (4.83 MPa (700 psi), 5.52 MPa (800 psi), and 6.21 MPa (900 psi)) on products distribution were investigated. The major products of hydrotreating process were catechol, anisole, phenol, cyclohexane, hexane, benzene, toluene, and xylene. Increasing the reaction temperature and hydrogen pressure improved HDO reactions. Complete HDO was achieved at reaction temperature of 400 °C and initial hydrogen pressure of 6.21 MPa (900 psi). Under these conditions, the selectivity to cyclohexane, benzene, toluene, and xylene over Ni/RM catalyst were 38.8, 24.5, 18.1, and 7.9% respectively, whereas these values were 62.2, 15.9, 8.4, and 4.5% respectively over Ni/SiO2-Al2O3. Reaction network and the kinetics of guaiacol HDO were proposed according to analysis of the products. The Ni/RM catalyst was more effective for deoxygenation reactions than hydrogenation while commercial Ni/SiO2-Al2O3 was more effective for hydrogenation than deoxygenation. Thus, hydrogen consumption per gram of bio-oil was lower for the Ni/RM catalyst compared to the Ni/SiO2-Al2O3. There was less hydrocracking and coke formation for the Ni/RM compared to the commercial catalyst and this resulted in higher liquid yield for the new catalyst.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.016
      Issue No: Vol. 558 (2018)
  • Insights into the role of silanols in methanol to propene reaction over
           silicalite-2 zeolite through post-treatments
    • Authors: Xiaojing Meng; Minxiu Zhang; Chunlin Chen; Chunyi Li; Wei Xiong; Min Li
      Pages: 122 - 130
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Xiaojing Meng, Minxiu Zhang, Chunlin Chen, Chunyi Li, Wei Xiong, Min Li
      As an efficient catalyst in methanol to propene (MTP), silicalite-2 zeolite was subjected to acidization and desilication. Changes in the properties of modified zeolites were investigated by XRD, FTIR, SEM, TPD, and sorption techniques. It was shown that the samples through post-treatments all showed a similar initial catalytic activity, while the deactivation behaviors were distinct. Samples through desilication exhibited a 2-fold improvement in catalytic lifetime (methanol conversion falling to 95%), while acidization accelerated the deactivation apparently. The results from in-situ FTIR and OH-FTIR revealed that the accessibility of acid sites (mainly H-bonded silanols) determines the initial activity and the location of isolated silanols is crucial for deactivation. The isolated silanols in the pore can impact the formation and diffusion of the intermediate species and subsequently affects the coke capacity and mobility. The external surface is indicated to be responsible for the tolerance of external coke. Thus, less internal isolated silanols and larger external surface area can jointly contribute to a long catalytic lifetime over silicalite zeolite.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.001
      Issue No: Vol. 558 (2018)
  • High performance Ni-Fe-Mg catalyst for tar removal in producer gas
    • Authors: Tinku Baidya; Robert J. Cattolica; Reinhard Seiser
      Pages: 131 - 139
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Tinku Baidya, Robert J. Cattolica, Reinhard Seiser
      A Ni-Fe-Mg material, supported on a ceramic substrate, suitable for application in a gasifier or reforming reactor was evaluated as a catalyst for tar decomposition via steam reforming. Experiments were conducted in a laboratory-scale fixed-bed reactor using simulated producer gas containing toluene and ethylene as tar surrogates. The catalyst was prepared by wet-impregnation and characterized by analytical techniques to include: BET, XRD, TPR, and SEM. The elemental composition of Ni, Fe, and MgO was optimized for maximum activity and stability. The optimized catalyst composition contained Ni, Fe, and MgO in the ratio 45:21:34 by weight. The observed catalyst activity was superior in comparison to other alkaline earth metal promoters: CaO, SrO, and BaO as well as a reference catalyst, Ni-K-MgO, in the temperature range between 600 and 800 °C. Time on stream with the optimized composition showed sustained tar (toluene + ethylene) conversion of near 100% at 750 °C for at least 48 h, indicating no coke formation. The coke formation affinity of Ni was reduced by the presence of the FeNi3 alloy. The enhanced performance with MgO is attributed to the strong adsorption of H2O forming Mg(OH)2 species facilitated on the oxide ion vacancy site of MgO acting as oxygen exchange site.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.026
      Issue No: Vol. 558 (2018)
  • Hydrodeoxygenation of triglycerides over reduced mesostructured
           Ni/γ-alumina catalysts prepared via one-pot sol-gel route for green
           diesel production
    • Authors: Arsia Afshar Taromi; Serge Kaliaguine
      Pages: 140 - 149
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Arsia Afshar Taromi, Serge Kaliaguine
      Environmentally friendly non-sulfided mesostructured Ni/γ-alumina catalysts were synthesized and developed to produce green diesel from canola oil. The catalysts were prepared either by a one-pot sol-gel (SG) via evaporation-induced self-assembly (EISA) or by incipient wetness impregnation (IMP). They were characterized by N2 adsorption-desorption, XRD, XPS, NH3-TPD and TEM. Due to the incorporation of nickel in the mesostructured framework, bulk nickel oxide species are lower for SG catalysts compared to IMP ones. Formation of active metallic nickel was confirmed after in-situ pre-reduction in H2 for both SG and IMP catalysts. Continuous hydrotreatment of canola oil was performed in a down-flow fixed-bed reactor, and the liquid hydrocarbon products mainly contained C15-C18 n-alkanes. SG catalyst exhibited a better stability up to 10 h of time on stream (TOS). The IMP catalyst initially showed higher conversion than SG up to TOS:300 min; it thereafter decreased sharply to values lower than those of SG.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.030
      Issue No: Vol. 558 (2018)
  • Influence of different precursors on isobutene production from bio-ethanol
           over bifunctional Zn1Zr10Ox catalysts
    • Authors: Biao Zhao; Yong Men; Anni Zhang; Jinguo Wang; Rong He; Wei An; Shenxiao Li
      Pages: 150 - 160
      Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558
      Author(s): Biao Zhao, Yong Men, Anni Zhang, Jinguo Wang, Rong He, Wei An, Shenxiao Li
      The effects of zinc precursors on the performance of bifunctinal Zn1Zr10Ox catalysts were investigated for direct conversion of bio-ethanol into isobutene (ETIB). The catalyst derived from zinc acetate precursor exhibited full ethanol conversion and 50% isobutene yield at a WHSV of 0.38 gethanol gcat −1 h−1 at 450 °C. Characterization results based on XRD, FT-IR, UV–vis, Raman, BET, CO2-TPD, NH3-TPD, H2-TPR, and XPS revealed that Zn1Zr10Ox catalyst prepared by zinc acetate precursor with large anion size possessed the highest zinc dispersion and the strong ZnO-ZrO2 interaction, and presented the highest ethanol reaction rate and isobutene yield under kinetic control regime. The beneficial effect of larger anion size was rationalized by the shielding effect in the incorporation model dominated by the size of capping anion in zinc precursors. Further durability test showed that the catalyst exhibited slow deactivation against coking formation while isobutene yield was maintained above 45% for 18 h.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.003
      Issue No: Vol. 558 (2018)
  • Styrene oxidation catalyzed by Au11(PPh3)7Cl3 and [Au11(PPh3)8Cl2]Cl
           nanoclusters: Impacts of capping ligands, particle size and charge state
    • Authors: Likai Wang; Jin Peng; Zhenghua Tang; Xiongwu Kang; Mingli Fu; Shaowei Chen
      Pages: 1 - 6
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Likai Wang, Jin Peng, Zhenghua Tang, Xiongwu Kang, Mingli Fu, Shaowei Chen
      Structurally similar molecule-like Au11(PPh3)7Cl3 and [Au11(PPh3)8Cl2]Cl nanoclusters have been successfully synthesized and employed as catalysts for selective oxidation of styrene. The two clusters exhibited similar but slightly different well-defined optical absorbance, and the subtle structural difference is also reflected in proton nuclear magnetic resonance (1H NMR) studies. In electrochemical measurements, Au11(PPh3)7Cl3 and [Au11(PPh3)8Cl2]Cl show a large electrochemical band gap of 2.15 eV and 2.09 eV, respectively. Styrene oxidation has been employed as a model reaction to investigate the impacts of the ligand shell composition on the catalytic activity and selectivity of the two clusters. Interestingly, the main product is benzaldehyde when oxygen is employed as oxidant, and the catalytic activity of Au11(PPh3)7Cl3 is higher than that of [Au11(PPh3)8Cl2]Cl. Under the same conditions, the two Au11 clusters exhibit much higher catalytic activity than larger clusters (Au25, Au38 and Au144) capped with phenylethiolates, as a manifestation of both size influence and surface ligand impacts. In addition, the oxidation efficiency of styrene exhibit a sharp increase when tert-butyl hydroperoxide is utilized as the oxidant, where the catalytic activities of Au11(PPh3)7Cl3 and [Au11(PPh3)8Cl2]Cl are comparable with styrene epoxide being the major product. Finally, the twin clusters are either reduced or oxidized to probe the charge effects upon the catalytic reaction, and it was found that the conversion of styrene went up with the charge state from reduced to oxidized for both clusters.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.001
      Issue No: Vol. 557 (2018)
  • Durability of Ni/TiO2 catalyst containing trace chlorine for CO selective
    • Authors: Naohiro Shimoda; Masashi Fujiwara; Kazunori Tani; Daiki Shoji; Makoto Takahashi; Kazuya Akiyama; Shigeo Satokawa
      Pages: 7 - 14
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Naohiro Shimoda, Masashi Fujiwara, Kazunori Tani, Daiki Shoji, Makoto Takahashi, Kazuya Akiyama, Shigeo Satokawa
      We investigated the durability of Ni/TiO2 catalyst in CO selective methanation reaction. In the reaction test up to 72 h, trace amounts of chlorine component contained in the catalyst gradually decreased. As a result, the progress of the methanation of CO2 increased, leading to a decrease in the reaction selectivity of the methanation of CO in the title reaction. By contrast, in the early stage of the reaction in which the elimination of chlorine component was small, it was confirmed that the number of active sites of metallic Ni increased, and the CO methanation activity was improved. Furthermore, it was found that the chlorine component in the catalyst was more remarkably removed by exothermic reaction heat under the methanation reaction atmosphere as compared with the case of heat treatment under other atmosphere. Catalyst durability under the conditions simulating a daily start-up and shut-down operation that repeated a cycle of cooling and heating the temperature of the catalyst layer to room temperature was also evaluated. As a result, we revealed that a trace amount of chlorine component was removed by exposure to condensed water, leading to a decrease in the reaction selectivity of the catalyst.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.02.032
      Issue No: Vol. 557 (2018)
  • Efficient and selective conversion of methanol to para-xylene over stable
           H[Zn,Al]ZSM-5/SiO2 composite catalyst
    • Authors: Donghui Pan; Xianghai Song; Xinghui Yang; Lijing Gao; Ruiping Wei; Jin Zhang; Guomin Xiao
      Pages: 15 - 24
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Donghui Pan, Xianghai Song, Xinghui Yang, Lijing Gao, Ruiping Wei, Jin Zhang, Guomin Xiao
      A highly shape-selective H[Zn,Al]ZSM-5/SiO2 composite catalyst was prepared by direct incorporating Zn species via isomorphous substitution into the zeolite framework and subsequent SiO2 deposition on zeolite surface. Its catalytic performance in methanol to aromatics (MTA) was compared with Zn/HZSM-5/SiO2 prepared by impregnation of Zn species and subsequent SiO2 deposition. The textural properties and acidic properties as well as the subsequent catalytic performances of the resultant catalysts in MTA reaction were obviously influenced by the introduction method of Zn species. H[Zn,Al]ZSM-5/SiO2 prepared by isomorphous substitution contained more inter-crystalline voids, which provided much space to resist deposition of coke and avoided quick blockage of micropore entrances. In contrast, Zn/HZSM-5/SiO2 prepared by impregnation contained sub-nanometric ZnO clusters at the pore entrances, which might restrict large molecule products diffusion and deteriorated the catalyst deactivation. Moreover, the sum of strong and medium acid sites in H[Zn,Al]ZSM-5/SiO2 was more than that in Zn/HZSM-5/SiO2, which meant there were more active sites for cyclization and aromatization steps in MTA reaction in the former. As a result, the lifetime of H[Zn,Al]ZSM-5/SiO2 was almost twice that of Zn/HZSM-5/SiO2. In addition, the enhancement in catalytic activity by Zn introduction and the improvement in para-selectivity in xylene by SiO2 deposition were also studied. Finally, nearly 100% methanol conversion, 95.6% para-selectivity in xylene and 18.2% para-xylene yield were simultaneously obtained over the stable H[Zn,Al]ZSM-5/SiO2 (with 24 h lifetime) in MTA reaction.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.006
      Issue No: Vol. 557 (2018)
  • Catalytic activities and resistance to HCl poisoning of Ni-based catalysts
           during steam reforming of naphthalene
    • Authors: Andrei Veksha; Apostolos Giannis; Wen-Da Oh; Victor W.-C. Chang; Grzegorz Lisak; Teik-Thye Lim
      Pages: 25 - 38
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Andrei Veksha, Apostolos Giannis, Wen-Da Oh, Victor W.-C. Chang, Grzegorz Lisak, Teik-Thye Lim
      Hydrogen chloride is commonly present in syngas produced from municipal solid waste and biomass gasification. The influence of HCl on the activity of nickel-based catalysts during catalytic naphthalene reforming was investigated. Two synthesized and two commercial catalysts were tested for steam reforming at 790 °C and SV 24,000 h−1. In the absence of HCl, nickel supported on limestone (Ni/Limestone) demonstrated lower naphthalene conversion (∼80%) compared to nickel supported on alumina (Ni/Alumina) and two commercial alumina supported catalysts (∼100%). In the presence of 2000 ppmv HCl, the naphthalene conversion of Ni/Limestone rapidly decreased due to the reaction with HCl and, probably, formation of molten CaCl2 deactivating the supported Ni nanoparticles. These data demonstrate limited applicability of calcium-based nickel catalysts for naphthalene reforming at the studied temperature. The efficiencies of Ni/Alumina and two commercial catalysts were maintained at ∼100% naphthalene conversion. However, HCl concentrations of 500–2000 ppmv had detrimental effect on water-gas shift activity of alumina supported catalysts during naphthalene reforming. The spent alumina supported catalysts were characterized by N2 adsorption, FESEM/EDS, XRD, XPS, TPR and TEM after the reforming in the absence and presence of HCl, and the results suggested that HCl increased nickel sintering in the catalysts causing the loss of water-gas shift activity. The losses of catalytic activity varied among the catalysts and were the lowest for Ni/Alumina, which contained nanosized porous alumina support and had the strongest Ni nanoparticle-support interactions.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.005
      Issue No: Vol. 557 (2018)
  • Plasma assisted oxidative coupling of methane (OCM) over Ag/SiO2 and
           subsequent regeneration at low temperature
    • Authors: Heesoo Lee; Dae-Hoon Lee; Jeong Myeong Ha; Do Heui Kim
      Pages: 39 - 45
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Heesoo Lee, Dae-Hoon Lee, Jeong Myeong Ha, Do Heui Kim
      In this study, oxidative coupling of methane (OCM) was carried out to produce C2 and C3 hydrocarbons directly from methane in a plasma-catalyst hybrid system. Since catalyst only reaction requires high temperature above 700 °C, dielectric barrier discharge (DBD) plasma was applied as plasma source to lower the reaction temperature. Among various supports, only SiO2 showed the higher yield than plasma only reaction when combined with DBD plasma, which led us to focus on the SiO2-based catalyst. It was found that Ag/SiO2 demonstrated the highest C2+ hydrocarbon yield of about 9.7% at 385 °C. In this process, oxygen was proved to play an essential role in the coupling of methane to C2+ hydrocarbons over Ag/SiO2 catalyst. However, Ag/SiO2 catalyst under plasma condition became deactivated with time-on-stream because of coking. It was demonstrated that plasma regeneration at 378 °C gave rise to the full recovery of activity while thermal regeneration did not due to the partial removal of coke and the sintering of Ag.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.007
      Issue No: Vol. 557 (2018)
  • TRA and DRIFTS studies of the fast SCR reaction over CeO2/TiO2 catalyst at
           low temperatures
    • Authors: Li Cao; Lei Chen; Xiaodong Wu; Rui Ran; Tengfei Xu; Ze Chen; Duan Weng
      Pages: 46 - 54
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Li Cao, Lei Chen, Xiaodong Wu, Rui Ran, Tengfei Xu, Ze Chen, Duan Weng
      The CeO2/TiO2 catalyst was prepared by a deposition-precipitation method, which exhibited high low-temperature activity under the fast SCR condition. By using transient reaction analysis (TRA), the steps in the fast SCR, including NO2 adsorption and decomposition, reaction between nitrates and NO, ammonium nitrate formation and reduction by NO, were investigated. Diffuses reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments, via NO + O2 or NO + NO2 adsorption, ammonium species reaction with NO x and NO reaction with NH4NO3, were designed to identify the roles of NO, NO2 and NH3 in fast SCR. Based on L-H mechanism, the NH4NO3 formation played an important role in low-temperature SCR reaction. Compared with the behavior in standard SCR, the higher activity in the presence of NO2 was ascribed to the faster NH4NO3 formation rate and larger amounts of nitrates/nitrites. This phenomenon provided a basis for developing Ce-based catalysts as SCR catalysts for diesel exhaust aftertreatment.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.012
      Issue No: Vol. 557 (2018)
  • Synthesis of middle distillate through low temperature Fischer-Tropsch
           (LTFT) reaction over mesoporous SDA supported cobalt catalysts using
           syngas equivalent to coal gasification
    • Authors: Sandip Mandal; Sudip Maity; Pavan K. Gupta; Abhishek Mahato; Piyali Bhanja; Gajanan Sahu
      Pages: 55 - 63
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Sandip Mandal, Sudip Maity, Pavan K. Gupta, Abhishek Mahato, Piyali Bhanja, Gajanan Sahu
      A series of silica doped alumina (SDA) [Si-Al2O3] having high surface area and narrow pore size distribution are synthesized with varying amount of silica and used as a support material to facilitate incorporation of Co, Mg and Zr into it. These supported Co-Mg-Zr/SDA materials are used as catalysts for selective synthesis of middle distillate through Fischer-Tropsch synthesis (FTS) reaction. Trace quantity (∼0.05 wt %) of ruthenium (Ru) has also been used as a promoter for Co -Mg-Zr/SDA catalyst to improve the reducibility, selectivity towards middle distillate and increasing the catalyst life. The detail characterizations of catalysts indicate that Ru promotion and narrow pore size distribution facilitate CO conversion and middle distillate selectivity. Synthetic syngas of composition (H2 = 28.63%, CO = 14.27%, CO2 = 9.25%, CH4 = 1.0%, and N2 = 46.85%), which may be obtained after coal gasification and H2 enrichment process by water gas shift (WGS) reaction has been used as a reactant for middle distillate synthesis. The role of Ru and silica proportion on Co-Mg-Zr/SDA is investigated through Low Temperature Fischer-Tropsch (LTFT) synthesis at 220 °C temperature and 30 bar pressure. The surface acidity of the Ru/Co-Mg-Zr/SDA catalyst plays an important role for middle distillate selectivity and CO conversion. To determine the durability of catalysts, 300 h continuous experimental run has been conducted at Gas Hourly Space Velocity (GHSV) of 500 h−1. Among the catalysts in the present study, Ru/Co-Mg-Zr/SDA(7.5) catalyst shows highest CO conversion (94.2%) with 85% selectivity of C6-C19 hydrocarbon.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.004
      Issue No: Vol. 557 (2018)
  • Facile air oxidative induced dealloying of hierarchical branched PtCu
           nanodendrites with enhanced activity for hydrogen evolution
    • Authors: Yuanxin Du; Kun Ni; Qingxi Zhai; Yapei Yun; Yajie Xu; Hongting Sheng; Yanwu Zhu; Manzhou Zhu
      Pages: 72 - 78
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Yuanxin Du, Kun Ni, Qingxi Zhai, Yapei Yun, Yajie Xu, Hongting Sheng, Yanwu Zhu, Manzhou Zhu
      In this work, we utilized a facile air oxidative dealloying approach to synthesize PtCu hierarchical branched nanodendrites (HBNDs). The systematical investigation on the morphology, composition, and structure of PtCu HBNDs by various techniques demonstrates they are three-dimensional open porous nanostructures. The PtCu HBNDs show composition-dependent catalysis in hydrogen evolution reaction (HER). The Pt1Cu1.03-D with average size about 40 nm composed of integrated ultrathin branches, presents the highest HER activity with only 20 mV overpotential to achieve 10 mA/cm2, 19.34 A/mgPt and 9.64 mA/cm2 in mass and specific activity at −0.2 V, and excellent durability. The superior HER activity is attributed to the unique porous dendritic structure and electronic synergistic interactions between Pt and Cu as indicated by X-ray photoelectron spectroscopy and density functional theory calculation. This work opens up a new facile route to design large accessible surface and high-performance electrocatalysts with low utilization of Pt for electrochemical energy conversion.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.014
      Issue No: Vol. 557 (2018)
  • Carbon-doped boron nitride nanosheet as a promising metal-free catalyst
           for NO reduction: DFT mechanistic study
    • Authors: Tanabat Mudchimo; Supawadee Namuangruk; Nawee Kungwan; Siriporn Jungsuttiwong
      Pages: 79 - 88
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Tanabat Mudchimo, Supawadee Namuangruk, Nawee Kungwan, Siriporn Jungsuttiwong
      Currently, metal-based catalysts are commonly used to convert highly toxic gases like NO molecules into less toxic gases, such as N2O molecules through the process of reduction reaction that has a low activation energy (E a) and high efficiency. Due to the high cost, environmental hazards and limited supply of metal-based catalysts, development of metal-free catalysts that are low cost and environmentally friendly has increased. For this research, NO reduction mechanism using the carbon-doped boron nitride nanosheets (CBNs) as a metal-free catalyst was investigated by density functional theory (DFT). For the NO reduction mechanism, the dimer mechanism pathway was investigated using the following equation: 2NO → N2O + Oad. In addition, the catalytic activity of carbon atom substitution onto BNs for NO reduction was studied. The results showed that the trans-(NO)2 structure of CNBNs (D5) is a potentially crucial intermediate with thermodynamically and kinetically favorable, in which the calculated rate-determining step along the most energetically favorable pathway is 0.62 eV. Hence, our results presented here suggest that CNBNs can be a highly active metal-free material in NO removal, which will reduce NO into environmentally friendly gases.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.02.025
      Issue No: Vol. 557 (2018)
  • The oxidative cleavage of trans-1,2-cyclohexanediol with O2: Catalysis by
           supported Au nanoparticles
    • Authors: Stefania Solmi; Elena Rozhko; Andrea Malmusi; Tommaso Tabanelli; Stefania Albonetti; Francesco Basile; Stefano Agnoli; Fabrizio Cavani
      Pages: 89 - 98
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Stefania Solmi, Elena Rozhko, Andrea Malmusi, Tommaso Tabanelli, Stefania Albonetti, Francesco Basile, Stefano Agnoli, Fabrizio Cavani
      This paper reports on the catalytic oxidative cleavage of trans-1,2-cyclohexanediol with air, catalysed by supported Au NPs, as one of the steps of a new adipic acid synthesis process. Catalysts proved to be active, with a moderate cyclohexanediol conversion and selectivity to adipic acid close to 70%. The reaction network included several steps in sequence, amongst which the key one is the oxidation of the diol into 2-hydroxycylohexanone, which is then oxidised by air – even in the absence of a catalyst – to adipic acid and lesser amounts of lighter acids, i.e. glutaric and succinic acids. The oxidation of the second hydroxyl moiety in the diol would lead to the formation of 1,2-cyclohexanedione. The latter, however, is rapidly transformed into several by-products, especially glutaric acid, under the basic conditions which are necessary for allowing the reaction to occur at an acceptable rate. With Au-based catalysts, this undesired reaction occurs much more slowly than with the previously investigated Ru hydroxide catalysts. The nature of the support, either TiO2 or MgO, also affected catalytic performance; the best performance was shown by the Au/MgO catalyst which, however, suffered from a remarkable deactivation, found to be due to both the increase in NPs size and the formation of carbonaceous residua on the catalyst surface.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.019
      Issue No: Vol. 557 (2018)
  • Bifunctional catalysts based on colloidal Cu/Zn nanoparticles for the
           direct conversion of synthesis gas to dimethyl ether and hydrocarbons
    • Authors: M. Gentzen; D.E. Doronkin; T.L. Sheppard; J.-D. Grunwaldt; J. Sauer; S. Behrens
      Pages: 99 - 107
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): M. Gentzen, D.E. Doronkin, T.L. Sheppard, J.-D. Grunwaldt, J. Sauer, S. Behrens
      Hybrid catalysts were prepared using well-defined, colloidal Cu/Zn-based nanoparticles as building units. The nanoparticles were immobilized on acidic supports (i.e., γ-Al2O3, HZSM-5, and HY) to yield a series of bifunctional catalysts with a close proximity of active sites for both methanol synthesis and its further conversion to dimethyl ether (DME) or hydrocarbons (HCs). By this model kit principle, a high comparability of the bifunctional catalysts was ensured. The catalysts were characterized in depth regarding their structure and catalytic performance in the conversion of CO-rich synthesis gas. In situ XAS studies demonstrated the formation of the active phase under reducing conditions. The present study revealed important material parameters to control activity and selectivity of the bifunctional catalysts either towards DME or liquefied petroleum gas (LPG) products in the direct conversion of simulated biomass-derived synthesis gas. In particular, Cu loading, pore structure and Si:Al ratio were investigated.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.008
      Issue No: Vol. 557 (2018)
  • Dichloromethane oxidation over FexZr1-x oxide catalysts
    • Authors: Zhen Zhang; Hangqi Xia; Qiguang Dai; Xingyi Wang
      Pages: 108 - 118
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Zhen Zhang, Hangqi Xia, Qiguang Dai, Xingyi Wang
      FexZr1-x-S mixed oxide catalysts were prepared by precipitation of FeSO4 and ZrOCl2, and used in catalytic oxidation of dichloromethane (DCM). Analyses by a series of characterization technologies reveal that Fe-O-Zr solid solution with tetragonal ZrO2 or α-Fe2O3 structure can be formed, dependent on Fe/Fe + Zr ratio. Residual SO4 2− species obtained from FeSO4 precursor exist in a form of bridged bidentate complex with Zr4+ or Fe3+ ion, which increases acidity significantly. FexZr1-x-S catalysts with Fe/Fe + Zr of 0.2–0.5 possess high contents of both SO4 2− and surface oxygen, and are highly active in catalytic combustion of DCM with T90 below 320 °C and TOFs at 200 °C of 0.98–1.89 μmol/(m2 min). Another test shows that the activity for the other CVOVs oxidation over Fe0.5Zr0.5-S is 1,2-dichloroethane > dichloromethane > trichloroethylene > 1,2-di chlorobenzene. Because the substitution of Cl species for surface oxygen is retarded, high stable activity maintains within reaction temperatures for at least 80 h. In situ FT-IR indicates that DCM is adsorbed and activated mainly through the formation of chloromethyl sulfate, which is oxidized quickly into formate ion. The synergism between SO4 2- complex anchoring on Zr-O-Fe solid solution and surface oxygen obtained from Fe2O3 cluster or nano-particles promotes the oxidation of formate.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2017.12.003
      Issue No: Vol. 557 (2018)
  • Specific zone within 8-membered ring channel as catalytic center for
           carbonylation of dimethyl ether and methanol over FER zeolite
    • Authors: Pei Feng; Guanqun Zhang; Xiaofang Chen; Kailu Zang; Xiujie Li; Longya Xu
      Pages: 119 - 124
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Pei Feng, Guanqun Zhang, Xiaofang Chen, Kailu Zang, Xiujie Li, Longya Xu
      The DFT investigation of methanol and dimethyl ether (DME) carbonylation at different sites of FER zeolite is carried out in an attempt to explore whether some specific acid sites are present to selectively catalyze the desired reaction. It is shown that the surface methoxy groups (SMG), generated by the reaction of methanol or DME with the Brønsted acid sites of zeolites, preferentially forms in the 8-membered ring (8MR) and 10-membered ring (10MR) channels. Further study of the CO attack on the SMG shows that, the carbonylation reaction occurs selectively at the 6MR zone of 8MR channel of FER zeolites. This result not only provides a theoretical perspective for the experimentally observed higher carbonylation reactivity of SMG located inside the 8MR channels, but also makes the location of the reaction more accurate.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.018
      Issue No: Vol. 557 (2018)
  • Operando magnetic resonance studies of phase behaviour and oligomer
           accumulation within catalyst pores during heterogeneous catalytic ethene
    • Authors: L. Baker; M.P. Renshaw; M.D. Mantle; A.J. Sederman; A.J. Wain; L.F. Gladden
      Pages: 125 - 134
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): L. Baker, M.P. Renshaw, M.D. Mantle, A.J. Sederman, A.J. Wain, L.F. Gladden
      Two-dimensional 1H magnetic resonance imaging and spatially-resolved 1H magnetic resonance spectroscopy and diffusion measurements were recorded as a function of time-on-stream within a fixed-bed reactor to provide direct measurements of the progress of the heterogeneous catalytic oligomerization of ethene occurring over a 1 wt% Ni-Al2O3-SiO2 catalyst. The catalyst bed was of internal diameter 2 cm; magnetic resonance measurements were recorded over a bed length of 5.5 cm. Experiments were conducted at a temperature and pressure of 110 °C and 29 bara, respectively, with continuous downflow of ethene at a flowrate of 0.78 L h−1. During conversion the accumulation of 1H-containing species within the catalyst pellets was imaged, and spatially-resolved 1H NMR spectra were recorded at 1 mm intervals along the length of the reactor. Diffusion-filtered 1D chemical shift imaging was used to discriminate between gas- and liquid-phase species along the length of the reactor at 1 mm intervals. Finally, spectrally-encoded pulsed field gradient measurements of molecular diffusion were employed to infer the molecular composition of the gas and liquid phases and to identify populations of these phases inside and external to the pore space of the catalyst pellets; these measurements were spatially-resolved along the length of the reactor, with data being averaged over sections of height 4 mm. The results are consistent with oligomers of carbon number C20 and greater existing within the pores of the catalyst pellets which act to block the pore space, thereby deactivating the catalyst.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.011
      Issue No: Vol. 557 (2018)
  • Glycerol dehydration to hydroxyacetone in gas phase over copper supported
           on magnesium oxide (hydroxide) fluoride catalysts
    • Authors: Stéphane Célerier; Sophie Morisset; Isabelle Batonneau-Gener; Thomas Belin; Khaled Younes; Catherine Batiot-Dupeyrat
      Pages: 135 - 144
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Stéphane Célerier, Sophie Morisset, Isabelle Batonneau-Gener, Thomas Belin, Khaled Younes, Catherine Batiot-Dupeyrat
      The dehydration of glycerol to hydroxyacetone was studied over copper-based catalysts using magnesium oxide (hydroxide) fluoride with various F/Mg ratio as support of copper. After calcination at 350 °C, the incorporation of copper, mainly at + II oxidation state, into the support lattice was observed for MgO and MgF(OH) while, copper was stabilized as Cu+1 at the surface of Cu-MgF2. The reaction of dehydration was performed using a mixture of glycerol and water (80%wt of glycerol), in gas phase at 260 °C. Cu-MgF2 was the most active catalyst with a yield in hydroxyacetone of 45.5%, while the catalytic activity was very low for Cu-MgF(OH) and Cu-MgO (yield in HA < 10%). Moreover, the performances obtained for Cu-MgF2 were higher than those obtained with La2CuO4, a reference catalyst. After four hours of reaction, Cu-MgF2 was not significantly modified, while for the two other catalysts, Cu2+ initially present was reduced into metallic copper. The results obtained revealed that the basic properties of the catalysts did not govern the reaction of dehydration of glycerol into HA. The best catalyst (Cu-MgF2) was the one possessing the higher amount of Lewis acid sites, and stabilizing copper at + 1 oxidation state.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.022
      Issue No: Vol. 557 (2018)
  • Combined catalytic action of supported Cu and Au in imine production from
           coupled benzyl alcohol and nitrobenzene reactions
    • Authors: Maoshuai Li; Fernando Cárdenas-Lizana; Mark A. Keane
      Pages: 145 - 153
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Maoshuai Li, Fernando Cárdenas-Lizana, Mark A. Keane
      The feasibility of continuous gas phase coupling of benzyl alcohol dehydrogenation with nitrobenzene hydrogenation for imine (N-benzylideneaniline) synthesis over mixtures of Cu/SiO2 and (TiO2, MgO) supported Au catalysts has been established. The catalysts were characterised in terms of specific surface area, pore volume, TPR, H2 chemisorption, STEM, XPS and TGA-DSC analysis. Au/TiO2 prepared by deposition-precipitation exhibited a narrower particle size distribution (1–6 nm) and smaller mean (3.2 nm) than Au/MgO (1–15 nm, mean = 7.7 nm) prepared by impregnation. Dehydrogenation of benzyl alcohol (to benzaldehyde) over Cu/SiO2 delivered a (ten-fold) higher rate than supported Au and Au/TiO2 exhibited a higher H2 chemisorption capacity and greater (by a factor of ten) nitrobenzene hydrogenation rate than Cu/SiO2 and Au/MgO. Inefficient hydrogen utilisation is demonstrated for the cross-coupling reaction over Cu/SiO2 alone and a temporal activity loss is linked to carbonaceous (benzoate) deposition (on the basis of XPS and TGA-DSC analysis). Incorporation of Au/TiO2 (and Au/MgO) with Cu/SiO2 increased the imine formation rate and H2 utilisation efficiency. The combination of Au/TiO2 with Cu/SiO2 served to circumvent Cu/SiO2 deactivation, resulting in enhanced stability with a four-fold increase in imine production and full H2 utilisation at Cu/Au = 10.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.024
      Issue No: Vol. 557 (2018)
  • Retraction notice to "Silica supported microporous melamine tri sulfonic
           acid catalyst towards biodiesel fuel production from waste cooking oil and
           utilization of side stream" [APCATA 494 (2015) 12 - 21]
    • Authors: Mehulkumar L. Savaliya; Bharatkumar Z. Dholakiya
      First page: 154
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): Mehulkumar L. Savaliya, Bharatkumar Z. Dholakiya

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.031
      Issue No: Vol. 557 (2018)
  • Retraction notice to "Isomerization of n-hexane with Pt/Ni-based catalysts
           supported on Al-rich zeolite Beta and correlation with acidity and
           oxidation state of metal crystallites" [APCATA 495 (2015) 173 - 183]
    • Authors: K.D. Oliveira; R.C. Santana; C.N. Ávila-Neto; D. Cardoso
      First page: 155
      Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557
      Author(s): K.D. Oliveira, R.C. Santana, C.N. Ávila-Neto, D. Cardoso

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.03.032
      Issue No: Vol. 557 (2018)
  • Graphical abstract TOC
    • Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558

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    • Abstract: Publication date: 25 May 2018
      Source:Applied Catalysis A: General, Volume 558

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    • Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557

      PubDate: 2018-04-25T00:35:58Z
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    • Abstract: Publication date: 5 May 2018
      Source:Applied Catalysis A: General, Volume 557

      PubDate: 2018-04-25T00:35:58Z
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