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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 6)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 229)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
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)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
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: 8)
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: 4)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 254)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 181)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Composites Science and Technology     Hybrid Journal   (Followers: 184)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Catalysis Letters
  [SJR: 0.777]   [H-I: 94]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-879X - ISSN (Online) 1011-372X
   Published by Springer-Verlag Homepage  [2355 journals]
  • Alkaline Earth (Ca, Mg) and Transition (La, Y) Metals Promotional Effects
           on Zn–Al Catalysts During Diethyl Carbonate Synthesis from Ethyl
           Carbamate and Ethanol
    • Authors: Kartikeya Shukla; Vimal Chandra Srivastava
      Pages: 1891 - 1902
      Abstract: Diethyl carbonate, an important member in the family of organic carbonates, is a fuel additive like dimethyl carbonate (DMC). It holds an extra edge of having better gasoline/water distribution coefficient than DMC, and also DEC is widely used as an electrolyte in lithium ion batteries. Ethanolysis of ethyl carbamate (EC) is the most economical and greener route for DEC synthesis. Zn–Al–M (M=Ca, La, Mg and Y) have been synthesized using two methods and their activity have been explored DEC systhesis from EC and ethanol. The catalysts were characterized using thermogravimetric analysis, Brunauer, Emmett and Teller surface area, N2 adsorption–desorption textural analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy, temperature-programmed desorption (TPD), atomic-force microscopy and Raman spectroscopy. Pure metal oxides were observed during the XRD analysis and Al2O3 was found to be in amorphous form. Third metal oxide prepared from impregnation method was found to be present on the surface as well as in impregnated form. CO2-TPD analysis showed close correlation between the basicity and the DEC yield. Zn–Al–Mg, prepared from precipitation method, being most basic, was found to be most effective although the performances of Zn–Al–Ca and Zn–Al–La were good. The effect of precipitants was also studied by synthesizing Zn–Al–Mg using NaOH and liquid NH3 as precipitants. DEC yield of 40.2% and turn over frequency of 1055 mgDEC gcat −1 h−1 was obtained in 5 h at 190 °C using Zn–Al–Mg prepared from precipitation method. Effect of reaction conditions was also studied and equilibrium constant of the reaction was estimated using the Benson group contribution method. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2097-2
      Issue No: Vol. 147, No. 8 (2017)
  • Enhanced Photocatalysis of g-C 3 N 4 Thermally Modified with Calcium
    • Authors: Xiaozhou Long; Tingnan Yan; Tianjiao Hu; Xianghui Gong; Huaming Li; Zengyong Chu
      Pages: 1922 - 1930
      Abstract: Graphitic carbon nitride (g-C3N4) with improved photocatalysis was prepared via thermal polymerization of dicyandiamide with the assistance of calcium chloride. The photocatalytic activity of the modified product was optimized by changing the weight ratio of calcium chloride to dicyanodiamine, and the final products were characterized by XRD, FTIR, SEM, TEM, XPS, BET, DRS and PL spectra. The results indicate that calcium chloride could lower the crystalline sizes of g-C3N4 due to its coordination effect with the edge ammonia of g-C3N4. The Valence band level decreased after the modification with higher oxidation capability. The photo-generated hole and the superoxide radical are the main active species in the degradation process. As a typical performance, the degradation rate of the modified sample is more than 50 times higher than that of the un-modified carbon nitride. Due to the weakened visible light absorption of the modified catalyst, the degradation of RhB can be mainly attributed to its excitation and enhanced transfer of electrons to the catalyst. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2099-0
      Issue No: Vol. 147, No. 8 (2017)
  • Preparation Scheme of Active Pt/SiC Catalyst and Its Phase Changes During
           Sulfuric Acid Decomposition to Produce Hydrogen in the SI Cycle
    • Authors: Hassnain Abbas Khan; Kwang-Deog Jung
      Pages: 1931 - 1940
      Abstract: The Pt/SiC-AP catalyst is prepared by the polyol method using acid treated SiC for sulfuric acid (SA) decomposition, which exhibits the highest activity and stability among the Pt/SiC catalysts prepared by four different methods. In a longer-term stability test at 850 °C and a GHSV of 53,500 mL/gcat/h for 30 h, the Pt/SiC-AP catalyst shows the SA conversion of 82%. The activity loss of the Pt/SiC-AP catalyst is observed at 15 h, but the catalyst is almost stabilized at the SA conversion of ca. 78% afterwards. The Pt loss with the Pt/SiC-AP catalyst is the least among the prepared catalysts. Most of Pt loss with the Pt/SiC-AP catalyst occurs within 5 h during the phase change from Pt/SiC to Pt/SixCyOz/SiC and the Pt loss is rarely observed for 30 h thereafter. The acid treatment of the SiC support improves the catalytic stability by enhancing the interaction between Pt and SiC and the Pt/SiC catalyst with well-dispersed Pt particles is obtained by using the polyol method. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2105-6
      Issue No: Vol. 147, No. 8 (2017)
  • Direct Chemical Vapor Deposition Growth of Graphene Nanosheets on
           Supported Copper Oxide
    • Authors: Sebastian Dayou; Brigitte Vigolo; Jaafar Ghanbaja; Ghouti Medjahdi; Mohd Zharif Ahmad Thirmizir; Hariy Pauzi; Abdul Rahman Mohamed
      Pages: 1988 - 1997
      Abstract: A facile chemical vapor deposition method was used to grow multi-layer graphene. A copper-based catalyst was homogeneously deposited on magnesium oxide powder surface by impregnation. The synthesis was conducted under atmospheric pressure without a dedicated reduction step prior to the reaction. The mechanism of multi-layer graphene growth was investigated by high-resolution transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. For the first time, we show that copper under its oxide form could catalyze the growth of multi-layer graphene. Such a simple method leading to produce multi-layer graphene of quite high structural quality could help to develop alternative ways for graphene production by chemical vapor deposition. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2125-2
      Issue No: Vol. 147, No. 8 (2017)
  • Microwave-assisted Hydrothermal Fabrication of Magnetic Amino-grafted
           Graphene Oxide Nanocomposite as a Heterogeneous Knoevenagel Catalyst
    • Authors: Hassan M. A. Hassan; Reda F. M. Elshaarawy; Sandeep Kumar Dey; Ilka Simon; Christoph Janiak
      Pages: 1998 - 2005
      Abstract: A rapid and facile one-step microwave-assisted hydrothermal approach was developed for the synthesis of diethylenetriamine (DETA)-functionalized graphene oxide decorated with Fe3O4 nanoparticles. This DETA-modulated magnetic graphene oxide (Fe3O4@DETA@GO) was used as a heterogeneous base catalyst for the Knoevenagel condensation. The composite demonstrated outstanding catalytic performance with easy recovery and reusability. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2120-7
      Issue No: Vol. 147, No. 8 (2017)
  • Catalytic Properties of Carboxymethyl Cellulase Produced from Newly
           Isolated Novel Fungus Penicillium ochrochloron ZH1 in Submerged
    • Authors: Hongzhi Bai; Hui Zi; Yuqian Huang; Mei Han; Muhammad Irfan; Ning Liu; Jinfeng Yang; Hui Wang; Xiaori Han
      Pages: 2013 - 2022
      Abstract: In this study a novel fungus, Penicillium ochrochloron ZH1 was isolated from soil and identified by 18S rDNA gene sequence technology. Various process parameters affecting CMCase production were optimized through one factor at a time. Results revealed that maximum enzyme production was obtained when medium was supplemented with 3% rice straw powder, 0.4% ground nut meal as nitrogen source, 0.050% CaCl2, with medium pH of 3.0 and 8% inoculum at 30 °C for 144 h of fermentation period. The purified CMCase had molecular weight of 29.7 kDa determined by SDS-PAGE. CMCase had pH and optima of 5.0 and 40 °C and retained 90% CMCase activity after 3 h at 50 °C. Ca2+ and K+ stimulated CMCase activity while Cu, Co and Ca2+ found to be inhibitors of CMCase. The purified CMCase had V max of 18.18 mg/ml/min and K m of 18.45 mg/ml for CMC as substrate specificity. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2119-0
      Issue No: Vol. 147, No. 8 (2017)
  • Performance of Nickel Supported on γ-Alumina Obtained by Aluminum
           Recycling for Methane Dry Reforming
    • Authors: Ysla França Adans; Adriana Daniela Ballarini; André Rosa Martins; Rodrigo Estevam Coelho; Luciene Santos Carvalho
      Pages: 2057 - 2066
      Abstract: In this paper, Ni/Al2O3 catalysts were prepared by using alumina synthesized from aluminum can powders, with or without ink. The catalysts produced were tested for methane dry reforming and showed not only high methane conversion (68–80%), but carbon dioxide (75–90%), selectivity to hydrogen (80–83%) as well as and H2/CO molar ratio close to 1. Therefore, it is a promising idea for future industrial applications. The results also showed that contaminant metals present in aluminum cans could affect the catalysts properties. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2088-3
      Issue No: Vol. 147, No. 8 (2017)
  • Catalytic Performance of Dicationic Ionic Liquids and ZnBr 2 in the
           Reaction of Epichlorohydrin and Carbon Dioxide: Kinetic Study
    • Authors: Pooja Jaiswal; Mahesh N. Varma
      Pages: 2067 - 2076
      Abstract: Cyclic carbonate synthesis is an attractive route to utilize CO2 and reduce green house gas. Numbers of studies have been reported on catalytic synthesis of cyclic carbonate, however, very few studies reported on kinetic analysis of cycloaddition reaction. Present study reports a kinetic analysis for coupling reaction of epichlorohydrin (ECH) and carbon dioxide catalyzed by various dicationic ionic liquids (DILs) and zinc bromide. Effects of structural change of DILs on its catalytic activity towards cycloadditiion reaction have also been explored. In addition an attempt has also been made to discuss the plausible reaction mechanism at optimal reaction conditions for coupling of ECH and CO2. At a catalyst loading of 0.5 mmol% C6 (mim) (mim) Br2 and 0.25 mmol% ZnBr2, ECH conversion of 98% can be obtained at 90 °C and 3 MPa in 40 min. Maximum conversion efficiency (98%) and minimum activation energy (20 kJ/mol) was associated with catalytic system comprising of C6 (mim) (mim) Br2 and ZnBr2. Thus, from industrial application point of view C6 (mim) (mim) Br2 and ZnBr2 are potential catalysts for cyclic carbonate synthesis. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2062-0
      Issue No: Vol. 147, No. 8 (2017)
  • The Effect of Covering Fe 2 O 3 with a Ga 2 O 3 Overlayer on Water
           Oxidation Catalysis
    • Authors: Eran Aharon; Maytal Caspary Toroker
      Pages: 2077 - 2082
      Abstract: Developing better electrode materials has attracted significant interest in recent years due to the utilization of electrochemical devices for energy conversion and storage. Specifically, iron (III) oxide (Fe2O3) has been widely considered as an anode material for water oxidation. Recently, major advances were made in improving Fe2O3 catalysis through surface coverage with material overlayers. In order to understand how material overlayers improve performance, we perform Density Functional Theory + U (DFT + U) calculations to model water oxidation catalysis on Fe2O3 partially covered with Ga2O3. We find that Ga2O3 overlayer shows no improvement in the calculated overpotential required for water oxidation on Fe2O3. This result suggests that Ga2O3 overlayer does not alter the catalytic reaction steps directly, but may be involved in other mechanisms related to charge transport and recombination that improve overall performance. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2093-6
      Issue No: Vol. 147, No. 8 (2017)
  • The Vibronic Theory of Size Effects in CO Oxidation by Gold Nanocatalysts
    • Authors: N. Turaeva; H. Krueger
      Pages: 2100 - 2105
      Abstract: A theoretical model, based on the vibronic theory of catalysis, has been developed for the CO oxidation reaction catalyzed by gold nanoparticles. The charge fraction transferred between the catalyst and the adsorbed CO molecule depends upon the relative positions of the size-dependent Fermi level of the cluster and the energy levels of the molecular orbitals of CO adsorbed onto the cluster. The charge transferred from the nanocluster to the adsorbed CO molecule increases the absolute values of forces deforming the molecule chemical bond and force constants defining the curvature of potential for nuclear oscillation leading to the decrease in activation energy for CO oxidation. The application of vibronic and jellium theories to CO oxidation provides an explanation of the observed cluster size effects. Graphical The relative locations of electronic energy levels of a gold cluster and a CO molecule before and after the adsorption onto the cluster surface
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2101-x
      Issue No: Vol. 147, No. 8 (2017)
  • Vanadium (V) and Tungsten (VI) Oxoperoxo-Complexes Anchored on Fe 3 O 4
           Magnetic Nanoparticles: Versatile and Efficient Catalysts for the
           Oxidation of Alcohols and Sulfides
    • Authors: Bagher Eftekhari-Sis; Masoud Akbari; Ali Akbari; Mojtaba Amini
      Pages: 2106 - 2115
      Abstract: Vanadium (V) and tungsten (VI) oxoperoxo complexes supported on Fe3O4 magnetic nanoparticles were synthesized and characterized. These compounds are assigned as catalyst 1 (C1: Fe3O4@Gly@r-Py@VO3) and catalyst 2 (C2: Fe3O4@Gly@r-Py@WO3), respectively, and were found to be efficient and reusable heterogeneous catalysts for the oxidation of alcohols and sulfides using H2O2. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2102-9
      Issue No: Vol. 147, No. 8 (2017)
  • Synthesis and Electrocatalytic Properties of Pt–Cu Worm-like
    • Authors: Lili Dong; Lanlan Li; Xiaofei Yu; Penggong Lü; Jianling Zhao
      Pages: 2127 - 2133
      Abstract: One-pot synthesis method has been proposed for preparing monodispersed and sub-10 nm Pt–Cu worm-like nanowires. The obtained nanowires were characterized by transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. According to the experiment results, it can be found that the reaction time, the temperature and the amounts of surfactants can influence the morphology of Pt–Cu nanowires. Moreover, the prepared Pt–Cu alloys and commercial Pt black were used as catalysts to test their electrocatalytic activity by means of cyclic voltammetry in a 0.5 M H2SO4 + 1 M CH3OH aqueous solution, and Pt–Cu nanowires exhibited significantly enhanced catalytic activity toward the methanol oxidation compared with commercial Pt black. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2104-7
      Issue No: Vol. 147, No. 8 (2017)
  • Facile pH-Dependent Synthesis and Characterization of Catechol Stabilized
           Silver Nanoparticles for Catalytic Reduction of 4-Nitrophenol
    • Authors: Hailemariam Gebru; Saide Cui; Zhenjiang Li; Xin Wang; Xianfu Pan; Jingjing Liu; Kai Guo
      Pages: 2134 - 2143
      Abstract: Catalysis by silver nanoparticles (Ag-NPs) in organic transformations has received growing attention due to their unique reactivity and selectivity. Herein, we investigated a versatile one-step approach for synthesizing thermally stable AgNPs using catechol (1,2-benzenediol) without additional reducing and stabilizing agents in aqueous solution. In an alkaline environment, oxidation of catechol played a dual role in the reduction of silver ions (Ag+) and stabilization of the AgNPs. Nanoparticles with different size and morphology were obtained under different experimental conditions. X-ray diffraction (XRD) analysis suggests the formation of crystalline AgNPs of average size 13, 38 and 47 nm and face centered cubic structure as the reaction pH varied. As demonstrated in dynamic light scattering (DLS) and scanning electron microscopy (SEM) images, AgNPs with uniform size distribution (50 nm) were synthesized at pH 11. The nanoparticles are thermally stable with a steady loss of weight up to 800 °C as confirmed by thermogravimetric analysis (TGA). Comparing to AgNPs@pH5 and AgNPs@pH8, AgNPs synthesized at pH 11 have shown significant catalytic activity in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with 61% conversion at 20 °C. The results suggested that stable and monodisperse nanoparticles with tunable catalytic activity could be produced as the pH of the reaction was altered. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2100-y
      Issue No: Vol. 147, No. 8 (2017)
  • Catalytic Performance of Oligonucleotide-Templated Pt Nanozyme Evaluated
           by Laccase Substrates
    • Authors: Yu Wang; Chuan He; Wei Li; Jinli Zhang; Yan Fu
      Pages: 2144 - 2152
      Abstract: Laccases are effective native biocatalysts for the oxidation of o-/p-diphenols, aminophenols, polyphenols and polyamines. To overcome the intrinsic limitations of native laccase involving pH, temperature and storage, highly dispersive Pt nanoparticles were synthesized by employing different oligonucleotides as stabilizing agents including A10, T10, C10 and G10, and their catalytic activities were assessed in the oxidation of laccase substrates under ambient air. This kind of Pt nanozyme displays high stability in the range of 20–90 °C and pH 3–9, beyond the range for native laccase. The laccase-like activities of Pt nanoparticles are greatly associated with the size distribution and the surface charge, which can be easily regulated by the sequence composition and the molar ratio of [precursor]/[template]. The most efficient C10-templated Pt nanozyme with 4.6 nm in size, exhibit three times higher affinity toward 2,4-dichlorophenol than that of native laccase. DNA-stabilized Pt nanoparticles display excellent catalytic performance in the oxidation of a wide range of substrates including dopamine, catechol, hydroquinone and p-phenylenediamine. This study paves a way to explore artificial nanoparticles to replace native laccase in the fields of biosensing and green synthesis. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2106-5
      Issue No: Vol. 147, No. 8 (2017)
  • Heterogeneous Catalytic Hydrogenation of Chiral Amino Acid Methyl Esters
           to Amino Alcohols with Retention of Configuration Over Mg-Modified
           Cu/ZnO/Al 2 O 3 Catalyst
    • Authors: Bing Zhan; Shuangshuang Zhang; Jun Yu; Xiuzheng Xiao; Xiaoming Guo; Dongsen Mao; Guanzhong Lu
      Pages: 2160 - 2166
      Abstract: Selective hydrogenation of amino acid methyl esters to chiral amino alcohols is an important and fascinating process. The CuZn0.3Mg0.1AlOx catalyst for the synthesis of chiral amino alcohols was prepared by the fractional co-precipitation method in the 50–100 g scale. The effect of the reduction gas on the catalytic activity, and the effects of the reaction conditions (R-p-m/Cat, temperature, reaction time, H2 pressure and solvent) on the catalytic hydrogenation of R-phenylglycine methyl ester (marked as R-p-m) were investigated. When R-p-m in the ethanol solvent was hydrogenated at 5 MPa of H2 and 80 °C for 10 h over this catalyst reduced by H2, 87.7% yield of R-phenylglycinol with ~ 100% ee value was obtained, and its reaction activation energy (Ea) was 36.7 kJ/mol. After repeated usage 16 times, its catalytic activity was hardly varied. Using this catalyst to catalyze the preparation of other amino alcohols, the high yield of product with ~100% ee value was obtained also. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2116-3
      Issue No: Vol. 147, No. 8 (2017)
  • A Mild, Efficient and Highly Selective Oxidation of Sulfides to Sulfoxides
           Catalyzed by Lewis Acid–Urea–Hydrogen Peroxide Complex at Room
    • Authors: Mojtaba Azizi; Ali Maleki; Farahman Hakimpoor; Reza Ghalavand; Ali Garavand
      Pages: 2173 - 2177
      Abstract: Alkyl and aryl sulfides were oxidized to the corresponding sulfoxides with urea–hydrogen peroxide (UHP) in the presence of FeCl3 as a Lewis acid catalyst under simple and mild reaction conditions. The protocol is efficient and highly selective and sulfoxides were obtained as the sole oxidation products in high yields at room temperature. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2126-1
      Issue No: Vol. 147, No. 8 (2017)
  • Can Ultrasound or pH Influence Pd Distribution on the Surface of HAP to
           Improve Its Catalytic Properties in the Dry Reforming of Methane'
    • Authors: Joanna Kamieniak; Elena Bernalte; Aidan M. Doyle; Peter J. Kelly; Craig E. Banks
      Pages: 2200 - 2208
      Abstract: The influence of ultrasound and different pH pre-treatments during the metal doping/modification of a hydroxyapatite (HAP) support is investigated. HAP is first synthesised via a hard-template synthetic route using carbon nanorods followed by their full physiochemical characterisation. The HAP was found to be crystalline and comprised a mesoporous structure as observed via XRD and nitrogen adsorption with a BET surface area of 97.57 (±1.16) m2 g−1. Ultrasound-assisted ion exchange (IE) and incipient wetness impregnation (IW) methodologies were employed to decorate the surface of HAP with Pd0 and are compared to previous procedures. The influence of pH upon the distribution of Pd0 throughout the samples during the doping process is also studied. All the prepared samples were evaluated for their catalytic activity towards dry reforming of methane (DRM) and the reaction was monitored via a thermal conductivity detector, coupled with gas chromatography (GC-TCD). It was found that ultrasound-assisted IE significantly accelerated the process from 3 days to 3 h and with the Pd0 metal remaining highly distributed upon the HAP with minor changes in catalytic conversions. Moreover, the ultrasound-assisted IW method successfully improved the Pd0 distribution and catalytic performance. On the other hand, the dispersion of the metal was unaffected after pH treatments in IE with no catalytic improvements observed, in contrast to IW, where considerable increase in metal distribution and subsequently catalytic performance was observed. Graphical
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2114-5
      Issue No: Vol. 147, No. 8 (2017)
  • Enhanced Hydroconversion of Lignin-Derived Oxygen-Containing Compounds
           Over Bulk Nickel Catalysts Though Nb 2 O 5 Modification
    • Authors: Shaohua Jin; Weixiang Guan; Chi-Wing Tsang; Dickson Y. S. Yan; Cho-Yin Chan; Changhai Liang
      Pages: 2215 - 2224
      Abstract: A series of bimetallic Nb–Ni oxide catalysts with different Nb/Ni molar ratio have been prepared by chemical precipitation method. XRD, Raman and XPS results indicate that amorphous Nb2O5 species exist in the samples with a Nb/Ni ratio about 0.087. The as-synthesized bimetallic Nb–Ni oxides effectively promote the dispersion of NiO active components, as a result effectively inhibit the agglomeration of NiO particles. Ni0.92Nb0.08O sample with the largest surface area of 173 m2/g mainly consists of fold-like nanosheets and the amorphous Nb2O5 species are well-dispersed all over the bulk NiO. After the reduction in hydrogen, the Nb-promoted bulk nickel catalysts display better catalytic performance for hydrodeoxygenation of lignin-derived anisole to biofuels than bulk Ni catalyst. The selectivity to deoxygenated products with using Ni0.92Nb0.08 catalyst increases 2.5 fold to that with bulk Ni catalyst at 160 °C and 3 MPa H2, as a result of the synergistic effect between amorphous Nb2O5 species and metal Ni active sites. In addition, with further increase in the reaction temperature to 200 °C, deoxygenation almost goes quantitatively. Graphical High-specific-surface-area Nb–Ni oxides are prepared by using chemical precipitation, and display excellent HDO performance for lignin-derived compounds. Selectivity to deoxygenated products increases 2.5 folds over Ni0.92Nb0.08 than over bulk Ni catalyst.
      PubDate: 2017-08-01
      DOI: 10.1007/s10562-017-2085-6
      Issue No: Vol. 147, No. 8 (2017)
  • Highly Effective Degradation of p -Nitrophenol Over MoS 2 Under Visible
           Light Illumination
    • Authors: Xing Liu; Lanhua Zhao; Hua Lai; Xing Zhang; Zhengji Yi
      Abstract: In recent years, some two-dimensional nanomaterials, such as graphene and molybdenum disulfide, cause extensive interests from scientists due to their excellent performances. In this paper, MoS2 was synthesized by a simple hydrothermal method without any assisted reagents, the MoS2 nanosheets display relatively high photocatalytic activity of p-nitrophenol degradation under visible light illumination (λ > 420 nm). Some experimental reaction conditions were optimized, the highest degradation efficiency of 55.0% is obtained within 120 min at initial 10.0 mg L−1 p-nitrophenol when the MoS2 is prepared at 200 °C for 20 h with the mole ratio of S/Mo = 1/1. A probable mechanism of photo-degradation was discussed. To our knowledge, there are no other reports on MoS2 photocatalytic degradation of phenolic compounds including p-nitrophenol so far. The present report is expected to contribute toward the disposal of highly toxic pollutant under visible light. Graphical
      PubDate: 2017-07-04
      DOI: 10.1007/s10562-017-2113-6
  • Ethanol Synthesis from Syngas Over CuZnX (X = Ti, Si, Al, Mg)
    • Authors: Li-Ping Cui; Tao Zhou; Na Li; Zhi-Hua Gao; Zhi-Jun Zuo; Wei Huang
      Abstract: The catalytic performance of ethanol synthesis from CO hydrogenation over CuZnX (X = Ti, Si, Al, Mg) catalysts prepared by complete liquid phase method are studied. Among these catalysts, CuZnTi catalyst has the best ethanol selectivity about 46.6%. Characterization results show that the interaction between Cu species and metal oxides is a key factor for ethanol synthesis from syngas, which is in accordance with our previous results. CuZnTi catalyst also has good repetitive performance. Graphical
      PubDate: 2017-07-03
      DOI: 10.1007/s10562-017-2128-z
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