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  Subjects -> ENGINEERING (Total: 2267 journals)
    - CHEMICAL ENGINEERING (190 journals)
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    - ELECTRICAL ENGINEERING (99 journals)
    - ENGINEERING (1196 journals)
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ENGINEERING (1196 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 216)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
Composites Part B : Engineering     Hybrid Journal   (Followers: 224)
Composites Science and Technology     Hybrid Journal   (Followers: 164)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | Last

Journal Cover 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  [2341 journals]
  • For Better Industrial Cu/ZnO/Al 2 O 3 Methanol Synthesis Catalyst: A
           Compositional Study
    • Authors: Kang Xiao; Qiong Wang; Xingzhen Qi; Liangshu Zhong
      Abstract: A series of industrial related Cu/ZnO/Al2O3 methanol catalysts with different compositions were prepared by parallel coprecipitation method at neutral condition. The structural properties were characterized through BET, XRD, TEM, TPD and TPR, and the catalytic performances were evaluated on a 4-tube stainless steel continuous flow fixed-bed microreactor. The influence of composition on performances was investigated. The results show that Al2O3 increases the long-term stability of catalysts due to stabilizing effect, meanwhile, Al also promotes the formation of zincian malachite phase as the precursor during coprecipitation and aging. Furthermore, Al2O3 surface acidity also affects the byproducts selectivity. Cu/Zn ratio influences the activity of catalysts which could be traced back to precursor phases. ZnO also affects the long-term stability probably derived from its spacing effect. Taking activity, long-term stability and product purity all into consideration, an optimized composition was found to be with 2.8 ≤ n(Cu)/n(Zn) ≤ 3.0 and 10 ≤ n(Al) ≤ 12, over which the performances are better than that of commercial C307 catalyst in our experiments. Graphical
      PubDate: 2017-04-18
      DOI: 10.1007/s10562-017-2022-8
       
  • Continuous Hydrogenolysis of Glycerol to 1,2-Propanediol Over Bi-metallic
           Ni–Ag Supported on γ-Al 2 O 3 Catalysts
    • Authors: V. Rekha; N. Raju; C. Sumana; N. Lingaiah
      Abstract: Continuous hydrogenolysis of glycerol was carried over bimetallic Ni–Ag supported on γ-Al2O3 catalysts. These catalysts were prepared by co-impregnation method. The catalysts surface and structural properties were derived from CO chemisorption, X-ray diffraction, temperature programmed reduction, temperature programmed desorption of NH3 and X-ray photoelectron spectroscopy. The presence of Ag led to the improvement in the dispersion, metal area and particle size of the Ni. Hydrogenolysis activity of Ni was enhanced by the synergistic effect of Ag. The catalyst with 10% Ni–5% Ag/γ-Al2O3 gave about 80% of glycerol conversion with 58% selectivity towards 1,2-propanediol. Effect of various reaction parameters on glycerol conversion and selectivity were also investigated and optimum condition were established. The time on stream analysis was carried and the catalysts exhibited stability. Graphical
      PubDate: 2017-04-12
      DOI: 10.1007/s10562-017-2052-2
       
  • The Effect of Graphene on Catalytic Performance of Palladium Nanoparticles
           Decorated with Fe 3 O 4 , Co 3 O 4 , and Ni (OH) 2 : Potential Efficient
           Catalysts Used for Suzuki Cross—Coupling
    • Authors: Hany A. Elazab; Sherif Moussa; Ali R. Siamaki; B. Frank Gupton; M. Samy El-Shall
      Abstract: In this research, we report a scientific investigation of an efficient method used for the synthesis of highly active Palladium Nanoparticles decorated with Fe3O4, Co3O4, and Ni (OH)2 Supported on Graphene as Potential Efficient Catalysts for Suzuki Cross—Coupling. Pd/Fe3O4 nanoparticles supported on graphene nanosheets (Pd/Fe3O4/G) showed an excellent catalytic activity for Suzuki coupling reactions and recycled for up to four times without loss of catalytic activity. An efficient magnetic catalyst has been successfully synthesized using a simple, reproducible fast and reliable method using microwave irradiation conditions. The prepared catalysts are magnetic as in case of iron and cobalt oxides which is an advantage in the separation process of catalyst from the reaction medium via applying a strong external magnetic field. The synthesis approach is based on the Microwave (MW)-assisted simultaneous reduction of palladium and ferric nitrates in the presence of graphene oxide (GO) nanosheets using hydrazine hydrate as the reducing agent. The results provide a fundamental understanding of the system variables by comparing the catalytic activity and recyclability of different catalysts with different properties. The most active and recyclable catalyst was Pd–Fe3O4—supported on graphene which offers several added advantages including recyclability of up to seven times, mild reaction conditions, and short reaction times in an environmentally benign solvent system. Furthermore, the magnetic properties imparted by the Fe3O4 component of the catalyst enables the catalyst to be easily isolated and recycled, thus greatly simplifying the ability to purify the reaction products and increasing the economic value of the catalyst. The utility of these magnetic catalysts towards Suzuki cross coupling reaction was also demonstrated. The high activity and recyclability of these catalysts are attributed to a strong catalyst-support interaction where the defect sites in the reduced GO nanosheets act as nucleation centers for anchoring the Pd and Fe3O4 nanoparticles thus minimizing the potential of their agglomeration and the subsequent decrease in the catalytic activity. Graphical
      PubDate: 2017-04-12
      DOI: 10.1007/s10562-017-1990-z
       
  • Effect of Al 2 O 3 /ZnO Ratio on Ni(Co)–AlZnO x Catalysts for Syngas
           Production by Steam Reforming of Acetic Acid
    • Authors: Saioa Goicoechea; Elka Kraleva; Heike Ehrich
      Abstract: Co- and Ni-based catalysts supported on AlZnOx were prepared using two different Al2O3/ZnO molar ratios in order to study the effect on syngas production by steam reforming of acetic acid. The catalytic properties analyzed by in-situ XRD, TEM, and TPR demonstrated that their composition affects the catalytic performance. Graphical
      PubDate: 2017-04-11
      DOI: 10.1007/s10562-017-2037-1
       
  • Deep Eutectic Solvent/Lipase: Two Environmentally Benign and Recyclable
           Media for Efficient Synthesis of N -Aryl Amines
    • Authors: Preeti Lalit Pant; Ganapati Subray Shankarling
      Abstract: Deep eutectic solvent (DES)/lipase catalyzed efficient synthesis of N-aryl amines from electron deficient aryl chlorides and amines at ambient temperature is reported. Its significant features include excellent yields of products, use of biodegradable, non-toxic and recyclable catalysts, thereby avoiding toxic metal catalyst/solvents making these protocols environmentally benign. Graphical
      PubDate: 2017-04-10
      DOI: 10.1007/s10562-017-2046-0
       
  • High-Surface Area Ceria-Zirconia Films Prepared by Atomic Layer Deposition
    • Authors: Tzia Ming Onn; Sheng Dai; Jiayao Chen; Xiaoqing Pan; George W. Graham; Raymond J. Gorte
      Abstract: Ceria-zirconia, solid solutions were prepared as thin, dense films on a 130-m2/g γ-Al2O3 by Atomic Layer Deposition (ALD) for use as catalyst supports. Ce0.5Zr0.5O2 solid solutions were grown by alternating between Ce(TMHD)4 and Zr(TMHD)4 precursors during ALD cycles. 50 precursor-oxidation cycles resulted in a material with 0.77 g Ce0.5Zr0.5O2 per g γ-Al2O3, corresponding to an average film thickness of 1.0 nm. The lattice parameter obtained from XRD was consistent with formation of a solid solution and scanning transmission electron microscopy (STEM) showed the mixed oxide was uniformly deposited. When impregnated with 1-wt% Pd, the ALD-prepared Ce0.5Zr0.5O2-γ-Al2O3 catalyst showed CO-oxidation activity similar to Pd on bulk Ce0.5Zr0.5O2; however, the ALD-prepared sample maintained much of its surface area and catalytic activity when heated to temperatures up to 1273 K. Graphical
      PubDate: 2017-04-10
      DOI: 10.1007/s10562-017-2053-1
       
  • A New Route for the Synthesis of Ammonium Thiotungstate, a Catalyst
           Precursor
    • Authors: K. Vega-Granados; M. Del Valle; A. Licea-Claverie; G. Alonso-Núñez; R. Romero-Rivera; L. López-Sosa; M. Avalos-Borja; J. Cruz-Reyes
      Abstract: Ammonium thiotungstate (ATT), (NH4)2WS4, is prepared by a new method using (NH4)2S, and compared with ATT obtained by conventional sulfidation with H2S(g). The XRD spectra of both samples are very similar to the simulated spectrum of ATT. UV–Vis and FT-IR spectra of both samples have characteristic bands for ATT. SEM micrographs show a similar morphology between the samples. TGA-DTA curves of both samples are the same, corresponding to the decomposition of ATT. Analytical results thus show that the ATT obtained by this new, safer, method is the same as the ATT obtained by sulfidation with poisonous H2S(g). The HDS activity of the WS2 catalyst derived from ATT prepared by the new method described here is equivalent to that of ATT prepared by the conventional method. Graphical
      PubDate: 2017-04-10
      DOI: 10.1007/s10562-017-2041-5
       
  • A New Type of Magnetically-Recoverable Heteropolyacid Nanocatalyst
           Supported on Zirconia-Encapsulated Fe 3 O 4 Nanoparticles as a Stable and
           Strong Solid Acid for Multicomponent Reactions
    • Authors: Somayeh Zolfagharinia; Eskandar Kolvari; Nadiya Koukabi
      Abstract: A novel highly efficient magnetically retrievable catalyst was developed by the immobilization of H3PW12O40 (20–60 wt%) on the surface of zirconia-encapsulated Fe3O4 nanoparticles. The prepared HPW supported on nano-Fe3O4@ZrO2 heterogeneous acid catalyst (or n-Fe3O4@ZrO2/HPW) was fully characterized by several physicochemical techniques such as: Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, vibrating sample magnetometry and thermogravimetric analysis. The FT-IR spectroscopic data revealed that H3PW12O40 molecules on the nano-Fe3O4@ZrO2 support existed in the Keggin structure. The acidity of the catalyst was measured by the help of a potentiometric titration with n-butylamine. It was surprising that this very strong solid acid catalyst exhibited an excellent acid strength which was as a result of possessing a higher number of surface active sites compared to its homogeneous analogues. The catalytic activity of the as-prepared novel nano-Fe3O4@ZrO2/HPW was explored through the one-pot three-component synthesis of different 3,4-dihydropyrimidin-2(1H)-ones (i.e. Biginelli reaction) and 1,4-dihydropyridines (i.e. Hantzsh reaction) under solvent free condition. The sample of 40 wt% showed higher acidity and activity in the catalytic transformation. After the reaction, the catalyst/product isolation could be easily achieved with an external magnetic field and the catalyst could be easily recycled for at least five times without any decrease in its high catalytic activity. The excellent recyclability was attributed to the strong interaction between the hydroxyl groups of the nano-Fe3O4@ZrO2 support and the HPW species. Graphical
      PubDate: 2017-04-10
      DOI: 10.1007/s10562-017-2015-7
       
  • Influence of Chitosan on the Microstructured Au/CeO 2 Catalyst: An
           Enhanced Catalytic Performance for CO Oxidation
    • Authors: Xueqin Ma; Ke Tang; Wei Liu; Zhao Genyuan; Wenshuang Zhu; Shuping Wang; Yonghua Guo; Hongxiao Yang; Jinxin Guo; Yanzhao Yang
      Abstract: In this work, a facile solvothermal method with the assistance of chitosan (CS) has been developed to prepare well-dispersed ceria core–shell nanospheres. The effects of CS on the growth mechanism and the catalytic performance of CeO2 and Au/CeO2 nanocomposites for CO oxidation are investigated in detail. CS leads to the formation of core–shell nanospheres as soft template, changing the exposed lattice planes, and reducing Ce4+ to Ce3+ as reducing agent, resulting in the increasing of the oxygen vacancy, following the co-existence of Au3+ and Au0, which leads to the improvement of the catalytic activity for CO oxidation. As a result, the synthesized Au/CeO2 nanospheres with the assistance of CS exhibit a higher catalytic activity in CO oxidation than Au/CeO2 like-cube. Graphical
      PubDate: 2017-04-10
      DOI: 10.1007/s10562-017-2039-z
       
  • Theoretical Insights to Bulk Activity Towards Oxygen Evolution in
           Oxyhydroxides
    • Authors: Andrew D. Doyle; Michal Bajdich; Aleksandra Vojvodic
      Abstract: The nature of the electrochemical water splitting activity of layered pure and Fe-doped NiOOH is investigated using density functional theory calculations. We find similar thermodynamics for the oxygen evolution reaction (OER) intermediates between the layers of oxyhydroxides, that is, in the bulk of the materials as on the (001) surface. The effect of interlayer spacing on adsorption energy is affected by both the crystal structure and the level of hydrogenation of the active sites. For the Fe-doped NiOOH, we observe general weakening of binding between the different OER intermediates and the catalyst material. The calculated OER activity depends both on doping and interlayer spacing, and our results are generally congruent with available experimental data. These results suggest that such interlayer “bulk” sites may contribute to measured OER activity for both the pure and Fe-doped NiOOH catalysts. Graphical
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2010-z
       
  • Noble-Metal-Free Copper Nanoparticles/Reduced Graphene Oxide Composite: A
           New and Highly Efficient Catalyst for Transformation of 4-Nitrophenol
    • Authors: Lixia Qin; Honglei Xu; Kun Zhu; Shi-Zhao Kang; Guodong Li; Xiangqing Li
      Abstract: A noble-metal-free reduced graphene oxide composite, copper nanoparticles (Cu NPs) loaded reduced graphene oxide (Cu/RGO), was prepared via a one-step in-situ reduction method. Furthermore, the catalytic activity of the composite for reduction of 4-nitrophenol (4-NP) was investigated. The results showed that the composite was a highly efficient, stable and low-cost catalyst for transformation of 4-NP. In the composite, Cu NPs acted as the cocatalyst and the RGO acted as the substance of electron transfer. The catalytic mechanism was also suggested. Graphical Copper nanoparticles loaded reduced graphene oxide (Cu/RGO) was prepared via a one-step in-situ reduction method. The Cu/RGO composite exhibited high catalytic activity and good recycle stability for treatment and transformation of 4-nitrophenol. Compared with the similar catalysts, the Cu/RGO composite is a cheaper, stable and highly efficient in practical application.
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2038-0
       
  • Controllable Synthesis of Ru Nanocrystallites on Graphene Substrate as a
           Catalyst for Ammonia Synthesis
    • Authors: Jiemin Zhao; Jiande Zhou; Mingwei Yuan; Zhixiong You
      Abstract: Controllable synthesis of Ru nanocrystallites on graphene substrate using polyol methods was reported herein. The zeta potential of graphene oxide dispersed in polyols is found to play a key role in tailoring the morphology and oxidation state of Ru nanocrystallites on graphene substrate. Negatively charged graphene oxide can coordinate with Ru3+ precursors via its carboxylic acid groups to form C–O–Ru complexes, leading to the epitaxial growth of hexagonally shaped cationic ruthenium nanocrystallites of 3–5 nm, which shows high catalytic activities for ammonia synthesis as expected; whereas positively charged graphene oxides can only interact with Ru3+ precursors via Van der Waals forces, resulting in a significant agglomeration of metallic ruthenium nanoparticles and thus a low catalytic performance. Graphical The morphology and oxidation state of ruthenium nanocrystallites supported on graphene substrate, thus the catalytic activity for ammonia synthesis, can be tailored by tuning the zeta potential of graphene oxide dispersed in polyols.
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2045-1
       
  • Pd–Cu Bimetallic Catalyst on Amidoxime Fiber Realizing an Alternative
           and High-Efficient Cyanation of Aryl Halide
    • Authors: Zhi-Chuan Wu; Quan Yang; Xin Ge; Yi-Ming Ren; Ren-Chun Yang; Ting-Xian Tao
      Abstract: The reaction of aryl halide cyanation through safe, efficient and stable pathway is of great significance in the industry of fine chemicals. Here, using potassium ferrocyanide and Pd–Cu bimetallic catalyst supported on amidoxime fibers (Cu(I)Pd(II)-AOFs), we propose an alternative reaction pathway for aryl halide cyanation. It shows that a high catalytic activity of cyanation is over 90% for aryl bromides/iodides and about 50% for aryl chlorides at reaction time (2 h), heating reflux in DMAc, in air. The morphology, composition and structure of the prepared catalysts are characterized by SEM, XRD and XPS. The changes of binding energy (N1s O1s Pd3d) show that Pd(II) ions is coordinated with the –NH2/–OH in AOFs, and that Pd(0) and Cu(II) are detected on the surface of AOFs after reaction. These results indicate that CuI makes Pd2+ reduce to Pd0 so as to produce activity central, and that AOFs coordination action is to enhance Pd0 central activity, and that CuI promotes the cyanide ion in potassium ferrocyanide dissociation. A high-efficient cyanation of aryl halide is successfully achieved by the synergistic action with the three actions. Graphical
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2040-6
       
  • Hydrocarbon Trapping over Ag-Beta Zeolite for Cold-Start Emission Control
    • Authors: Sung Bong Kang; Christos Kalamaras; Vemuri Balakotaiah; William Epling
      Abstract: Toluene, hexane, ethane, ethylene and CO adsorption and desorption on/from model Ag-exchanged beta zeolites were evaluated. The presence of water significantly inhibited adsorption of ethylene below 100 °C, whereas hexane and toluene adsorption were not affected. The addition of Ag increased adsorption capacities and desorption temperatures for both ethylene and toluene, while no difference was observed for hexane. Under conditions containing all hydrocarbons, ethylene adsorption was absent, and the toluene adsorption rate decreased. Results with binary mixtures demonstrate the inhibition of ethylene adsorption is due to toluene and the slower rate of toluene adsorption is caused by hexane. Graphical
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2044-2
       
  • Cobalt Oxides Supported Over Ceria–Zirconia Coated Cordierite Monoliths
           as Catalysts for Deep Oxidation of Ethanol and N 2 O Decomposition
    • Authors: K. Jirátová; J. Balabánová; F. Kovanda; A. Klegová; L. Obalová; R. Fajgar
      Abstract: Cordierite monoliths coated with ceria–zirconia supporting cobalt oxide were prepared, examined in the deep oxidation of ethanol and N2O decomposition, and compared with pelletized commercial cobalt oxide catalyst. Interaction of Co3O4 with ceria–zirconia washcoat led to formation of Co3O4 particles with slightly worse structure ordering resulting in better reducibility than that observed for the commercial Co3O4 catalyst. In oxidation of ethanol, activity of the Co3O4-containing monoliths was comparable with that of pelletized cobalt oxide catalyst with nearly seven times higher content of active components. However, conversions of N2O over the monolith catalysts were lower. Nevertheless, incorporation of Co3O4 onto ZrO2–CeO2 washcoat increased rate of both catalytic reactions, i.e., N2O decomposition and deep ethanol oxidation. Graphical
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2047-z
       
  • The Evaluation of Synthesis Route Impact on Structure, Morphology and
           LT-WGS Activity of Cu/ZnO/Al 2 O 3 catalysts
    • Authors: Paweł Kowalik; Katarzyna Antoniak-Jurak; Wiesław Próchniak; Paweł Wiercioch; Marcin Konkol; Robert Bicki; Kamila Michalska; Michał Walczak
      Abstract: Four different techniques (co-precipitation, urea homogeneous precipitation, citrate sol–gel auto-combustion, solid state formate assisted) were used in preparation of a series of Cu/ZnO/Al2O3 catalysts, having a nominal composition: (Cu/Zn)mol = 2.5 and (Cu + Zn)/Almol = 3. The catalytic materials were investigated by various methods. The activity of the CuZnAl catalysts in the LT-WGS process was compared. The results revealed that the co-precipitation technique and subsequent thermal decomposition provided the Cu/ZnO/Al2O3 catalyst with the higher specific surface area and more advantageous surface morphology. It was shown that co-precipitation of hydroxycarbonate precursors at constant pH and their subsequent thermal treatment provided the most active WGS catalyst compared to other techniques. Graphical
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2048-y
       
  • Dynamic Impact of RuCl 3 Catalyst on the Oxidation of Cyclamate with
           Acidified Bromamine-T: Elucidation of Mechanistic Pathways and Kinetic
           Modeling
    • Authors: Ramya Radhakrishnan; Puttaswamy
      Abstract: Oxidation-Kinetics of cyclamate by bromamine-T (BAT) in HClO4 medium catalyzed by RuCl3 exhibits a first-order dependence on [BAT]0, fractional-order on both [Cyclamate]0 and [RuCl3], and inverse fractional-order on [HClO4]. RuCl3 catalyst accelerated the reaction by a splendid 48 times. Plausible mechanism and related rate law have been deduced. Graphical The Stoichiometry of the reaction is:
      PubDate: 2017-04-07
      DOI: 10.1007/s10562-017-2034-4
       
  • Heterogeneous Photo-Fenton Degradation of Norfloxacin with Fe 3 O 4
           -Multiwalled Carbon Nanotubes in Aqueous Solution
    • Authors: Tian Shi; Jun Peng; Jianqiu Chen; Cheng Sun; Hua He
      Abstract: A catalyst, ferroferric oxide nanoparticles decorated with multiwalled carbon nanotubes was successfully fabricated, and applied for the degradation of norfloxacin in the presence of H2O2 and xenon light. The catalyst was characterized by different techniques i.e., X-ray diffraction, transmission electron microscope, and fourier transform infrared. The effects of initial pH, catalyst dosage, hydrogen peroxide concentration and iron leaching on the degradation of norfloxacin were studied. The multiwalled carbon nanotubes showed higher ability of degradation efficiency of norfloxacin than bare Fe3O4 nanoparticles in the batch degradation experiment. The results showed that the multiwalled carbon nanotubes catalyst demonstrated good performance in the degradation of norfloxacin with optimum operating conditions of multiwalled carbon nanotubes 1.2 g L−1, pH 3.0, H2O2 0.098 mol L−1 and the multiwalled carbon nanotubes catalyst still exhibited good chemical stability after five consecutive degradation cycles. Further, the catalyst showed stable catalytic activity, fairly good mechanic stability and convenient recycling. Negligible iron leaching demonstrated the reused multiwalled carbon nanotubes could withstood the oxidation. Graphical
      PubDate: 2017-04-06
      DOI: 10.1007/s10562-017-2026-4
       
  • Isomerization of Styrene Oxide to Phenyl Acetaldehyde over Different
           Modified Beta Zeolites
    • Authors: Xiong-Fei Zhang; Jianfeng Yao; Xiaoxia Yang
      Abstract: The catalytic performance of the isomerization of styrene oxide to phenyl acetaldehyde was investigated over different modified beta catalysts under gas-phase atmosphere free of solvents. The physicochemical properties were characterized by a combination of X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared spectroscopy (FT-IR), Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR), NH3-Temperature programmed desorption (NH3-TPD) and thermo gravimetric analysis (TGA), etc. Acid sites with stronger strength are responsible for the formation of condensation products and fast deactivation of catalysts. The obtained results also demonstrate that the introduction of boron atoms can create suitable acid strength and acid distribution without significantly destroying its microporous structures. Therefore, BAl-BEA sample is highly active and selective for the rearrangement of styrene oxide as well as very stable to deactivation. Graphical
      PubDate: 2017-04-06
      DOI: 10.1007/s10562-017-2004-x
       
  • Synthesis of Ditetrahydrofurfuryl Carbonate as a Fuel Additive Catalyzed
           by Aminopolycarboxylate Ionic Liquids
    • Authors: Wei Huang; Duan-Jian Tao; Feng-Feng Chen; Wei Hui; Jia Zhu; Yan Zhou
      Abstract: A new series of aminopolycarboxylate ionic liquids were designed, synthesized, and applied for efficient and selective synthesis of ditetrahydrofurfuryl carbonate (DTC). Tetraethylammonium nitrilotriacetate ([N2222]3[NTA]) was demonstrated to show the best catalytic performance, in which DTC could be obtained at a yield of 80% under optimum conditions. Graphical
      PubDate: 2017-04-04
      DOI: 10.1007/s10562-017-2043-3
       
 
 
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