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  Subjects -> ENGINEERING (Total: 2287 journals)
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ENGINEERING (1206 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: 234)
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 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 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: 30)
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: 15)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
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)
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: 5)
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: 10)
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: 31)
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  
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: 8)
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: 10)
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: 258)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 180)
Composites Part B : Engineering     Hybrid Journal   (Followers: 236)
Composites Science and Technology     Hybrid Journal   (Followers: 215)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 14)
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: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 58)

        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  [2353 journals]
  • Five-membered N -Heterocycles Synthesis Catalyzed by Nano-silica Supported
           Copper(II)–2-imino-1,2-diphenylethan-1-ol Complex
    • Authors: Hashem Sharghi; Pezhman Shiri; Mahdi Aberi
      Abstract: In this study, a new amino functionalized nano silica was synthesized using 2-hydroxy-1,2-diphenylethan-1-one. The new 2-hydroxy-1,2-diphenylethan-1-one@amino functionalized nano-silica was used as a support material for copper(II) catalyst. This composite was characterized by various techniques such as transmission electron microscopy, field emission scanning electron microscope, X-ray powder diffraction, inductively coupled plasma, energy dispersive X-ray spectroscopy, thermal gravimetric and FT-IR analysis and its particles size was estimated to be between 20 and 30 nm. The catalyst was tested in the N-heterocycles synthesis via C–N bond forming reactions. The catalyst displayed outstanding catalytic activity for all reactions under mild conditions. Finally, the nano heterogeneous copper catalyst is recoverable up to 12 times without any significant leaching which indicated that the heterogeneous catalyst is stable and very active under the applied conditions. Graphical
      PubDate: 2017-09-18
      DOI: 10.1007/s10562-017-2173-7
       
  • Phosphotungstic Acid Immobilized on Imidazole Poly(ionic liquid) for
           Isomerization of α-Terpineol to 1,8-Cineole
    • Authors: Rongjun Wu; Lei Song; Guifeng Ma; Yuzhong Su; Yanzhen Hong; Hongtao Wang; Jun Li
      Abstract: Phosphotungstic acid (PW) was successfully immobilized on imidazole poly(ionic liquid) (PIL) via ion-exchange for the catalytic isomerization of α-terpineol to 1,8-cineole. TG, XRF, FT-IR, XRD, NH3-TPD and DSA were subsequently used to characterize the PW/PIL catalyst. High catalytic activity and stable performance of the catalyst were achieved. A series of 1-alkyl-3-vinylimizolium bromide monomers (alkyl from ethyl to hexadecyl) were applied for the synthesis of PILs as the supports of PW. Results revealed that the lipophilicity of longer chain alkyl PIL exposed the PW active sites efficiently, which consequently enhanced the α-terpineol conversion and reduced the reaction time. Graphical
      PubDate: 2017-09-15
      DOI: 10.1007/s10562-017-2148-8
       
  • Production of 1,2-Propanediol from Renewable Glycerol Over Highly Stable
           and Efficient Cu–Zn(4:1)/MgO Catalyst
    • Authors: Smita Mondal; Al Ameen Arifa; Prakash Biswas
      Abstract: Highly stable, efficient and reusable Cu4Zn1MgO catalyst was developed for selective hydrogenolysis of glycerol to 1,2-propanediol (1,2-PDO). Almost complete conversion of glycerol with ̴ 94% selectivity to 1,2-PDO was obtained at mild reaction condition. The probable reaction mechanism for the formation of 1,2-PDO from glycerol is proposed. Graphical
      PubDate: 2017-09-15
      DOI: 10.1007/s10562-017-2187-1
       
  • Ag-enhanced Catalytic Performance of Ordered Mesoporous Fe–N-Graphitic
           Carbons for Oxygen Electroreduction
    • Authors: Zhengyan Chen; Congling Li; Yangyang Ni; Fantao Kong; Aiguo Kong; Yongkui Shan
      Abstract: Mesoporous Fe–N–C supported Ag nanoparticles (AgNPs) with different metal loadings (Fe–N–C/AgNPs-n, n = 1, 2, 3) were prepared by a facile method. The as-prepared Fe–N–C/AgNPs-n catalysts were demonstrated to be the excellent electrocatalysts for oxygen reduction reaction (ORR) in alkaline media. The Fe–N–C/AgNPs-2 exhibited the highest electrocatalytic activity with onset potential of 1.03 V and half-wave potential of 0.88 V for ORR, which were higher than commercial Pt/C (20 wt%) and Fe–N–C catalysts reported in the literature. Moreover, the prepared Fe–N–C/AgNPs-2 material possessed intrinsic long-time stability and the excellent methanol resistance toward the ORR in alkaline media. The Tafel slope and Tafel curve shape for ORR on Fe–N–C/AgNPs-n and Fe–N–C and the decrease of N’s binding energy in the Fe–N–C/AgNPs-n testify that the active sites for ORR in Fe–N–C/AgNPs-n are on Fe–N–C rather than on AgNPs. The AgNPs enhance the electrocatalytic activity of Fe–N–C for ORR as cocatalyst by inducing a more negative charge on the adjacent N to C, which may be the important reason for improving ORR performance of Fe–N–C. Graphical
      PubDate: 2017-09-13
      DOI: 10.1007/s10562-017-2186-2
       
  • Oxygen Mobility in Pre-Reduced Nano- and Macro-Ceria with Co Loading: An
           AP-XPS, In-Situ DRIFTS and TPR Study
    • Authors: Hyuntae Sohn; Gokhan Celik; Seval Gunduz; Doruk Dogu; Shiran Zhang; Junjun Shan; Franklin Feng Tao; Umit S. Ozkan
      Abstract: The size effect of ceria nanoparticles on surface oxygen mobility and formation of surface oxygen vacancies in ethanol steam reforming was investigated. Higher concentration of Ce3+ surface sites of the ceria nano-particles (~4 nm, NP) was observed compared to the micro-particles (~120 nm, MP). Similarly, studies using ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) exhibited higher intensity of O1s assigned to the hydroxyl group bonding to Ce3+ and significantly lower intensity for lattice oxygen, stemming from an increase in the number of oxygen vacancies and enhanced oxygen mobility in the nano-ceria under ethanol steam reforming conditions. The presence of fully reduced cobalt particles (Coo) facilitated ceria reduction through hydrogen spillover. The comparison of cerium oxidation states between pre-reduced CeO2 and pre-reduced Co/CeO2 indicated higher extent of reduction of cerium in the case of Co/CeO2 for ethanol steam reforming. These results, together with our previous investigations where higher Ce3+ was observed over CeO2 compared to Co/CeO2 after pre-oxidation treatments, indicate that the initial state of cobalt in Co/CeO2 affects the oxidation state of cerium. Lastly, both nano-ceria and micro-ceria bare supports showed moderate C–C cleavage activities in ethanol steam reforming where better activity was observed over nano-ceria. Formate species were observed predominantly in the DRIFTS spectra of the nano-ceria whereas major species were acetates for micro-ceria. The dissimilarity in the reaction network was attributed to the difference in the number of surface oxygen vacancies. The Co/CeO2-NP catalyst was found more active compared to Co/CeO2-MP with higher hydrogen yield and ethanol conversion. Graphical
      PubDate: 2017-09-13
      DOI: 10.1007/s10562-017-2176-4
       
  • Molybdate/Antimonate as Key Metal Oxide Catalysts for Acrolein
           Ammoxidation to Acrylonitrile
    • Authors: Nguyen Thanh-Binh; Jean-Luc Dubois; Serge Kaliaguine
      Abstract: Acrylonitrile, a large tonnage chemical used in the polymer industry, may be produced by ammoxidation of acrolein, the latter being possibly obtained by glycerol dehydration. This would provide a green acrylonitrile synthesis as compared to the present industrial practice which involves ammoxidation of propylene (or propane) of fossil origin. Traditionally, antimonate and molybdate based catalysts are used for propylene ammoxidation to acrylonitrile, and these catalysts should be also active for acrolein conversion. In this work, we report a simple method for synthesis of mixed antimonate and molybdate with various molar ratios supported on mesostructured silica in order to obtain highly porous and high specific surface area materials. The results indicate that molybdenum oxide plays a major role for the acrolein ammoxidation compared to antimony oxide. Acrolein conversion and acrylonitrile selectivity were reduced with increasing fraction of antimony oxide in the mixture. The catalysts were characterized by \({\text{N}_2}\) physisorption, X-ray diffraction, Raman spectroscopy, thermal gravimetric analysis, inductively coupled plasma, transmission electron microscopy, X-ray photoelectron spectroscopy, and catalytic tests. Graphical
      PubDate: 2017-09-13
      DOI: 10.1007/s10562-017-2171-9
       
  • Cs 2.5 H 0.5 PW 12 O 40 Encapsulated in Metal–Organic Framework UiO-66
           as Heterogeneous Catalysts for Acidolysis of Soybean Oil
    • Authors: Wenlei Xie; Xinli Yang; Pengtao Hu
      Abstract: The Keggin-type Cs2.5H0.5PW12O40 was encapsulated in metal–organic framework UiO-66 by a simple solvothermal synthesis method. The characterization results showed that the morphology and crystal structure of UiO-66 were preserved, and the heteropolyanion structure remained unchanged after Cs2.5H0.5PW12O40 encapsulation. The prepared Cs2.5H0.5PW12O40@UiO-66 material has demonstrated to be an environmentally benign catalyst in the acidolysis of soybean oil with medium-chain fatty acids for the production of low-calorie structured lipids. The FT-IR CO adsorption experiments revealed that additional Lewis acid sites were formed in the solid acid catalyst, which were essential to catalyze the acidolysis reaction. The solid catalyst could be reused for several recycles without obvious deactivation due to hardly leaching of active components into the reaction mixture. Graphical
      PubDate: 2017-09-13
      DOI: 10.1007/s10562-017-2189-z
       
  • Highly Stable and Recyclable Graphene Layers Protected Nickel–Cobalt
           Bimetallic Nanoparticles as Tunable Hydrotreating Catalysts for
           Phenylpropane Linkages in Lignin
    • Authors: Bingfeng Chen; Fengbo Li; Guoqing Yuan
      Abstract: Nickel–cobalt bimetallic nanoparticles coated with several layers of graphene were developed through direct heating treatment of bimetallic oxide precursor prepared by the modified Pechini-type sol–gel method. These nanomaterials were demonstrated to be versatile catalysts for lignin depolymerization. The catalysts showed unexpectedly tunable selectivity that directly depends on the composition of bimetallic nanoparticles. Dimeric lignin model compounds can be converted totally and the hydrogenolysis selectivities above 85% over Ni–Co@C (Ni:Co = 1:3). During the recycling test, the nanocatalyst showed excellent recyclability in the ten-batch investigation. The deposition of graphene layers over bimetal nanoparticles fosters a subtle balance between protecting effects and surface accessibility to catalytic reactions and significantly improves their stability to air and moisture. Ni–Co@C catalysts were readily separated from the liquid mixtures with high recycling ratio due to their magnetic properties. Graphical Ni–Co bimetallic nanoparticles are coated with graphene layers. Graphene layers over the nanoparticles protect them from deactivation. Ni–Co@C shows tunable selectivity in the hydrogenolysis of dimeric lignin linkage. The non-precious metal catalyst showed excellent recyclability and can be reused ten times without significant loss of activity.
      PubDate: 2017-09-12
      DOI: 10.1007/s10562-017-2179-1
       
  • Alcoholysis of Furfuryl Alcohol into n -Butyl Levulinate Over SBA-16
           Supported Heteropoly Acid Catalyst
    • Authors: Enumula Siva Sankar; K. Saidulu Reddy; Yadagiri Jyothi; Burri David Raju; Kamaraju Seetha Rama Rao
      Abstract: In this work, n-butyl levulinate a potential renewable chemical in the energy sector and in the field of fine chemical synthesis has been synthesized via alcoholysis of furfuryl alcohol in batch process at atmospheric pressure over SBA-16 supported tungstophosphoric acid (TPA) catalyst. In order to characterize and correlate the catalytic activity, the wet impregnated TPA/SBA-16 catalysts were subjected to the physico chemical characterization techniques such as X-ray diffraction, N2-physisorption, SEM, TEM, FT-IR, NH3-TPD and pyridine adsorbed FT-IR analysis. The retention of 3D mesoporous structure and TPA structure even after impregnation was confirmed by XRD and N2-physisorption. The impregnation of TPA over SBA-16 creates the more number of available active acidic sites for the reactants. 25 wt% TPA/SBA-16 offers 97% selectivity to n-butyl levulinate with complete conversion of furfuryl alcohol in 3 h. Various reaction parameters were optimized to achieve the best catalytic activity. These results imply that the conversion of furfuryl alcohol to n-butyl levulinate go on with the formation of the intermediate 2-butoxymethylfuran. The recyclability of the catalyst and characterization of the spent catalyst was also studied. Graphical SBA-16 supported TPA catalyst is effective in the conversion of furfuryl alcohol to n-butyl levulinate at atmospheric pressure.
      PubDate: 2017-09-09
      DOI: 10.1007/s10562-017-2155-9
       
  • Understanding the Effect of NO Adsorption on Potassium-Promoted Co 3 O 4
           for N 2 O Decomposition
    • Abstract: Co3O4 and K/Co3O4 were tested in catalytic N2O decomposition. K/Co3O4 exhibited higher activity than Co3O4, which was drastically and irrecoverably decreased with added NO. Studies revealed that the Co2+ valence state changed after NO adsorption, and that potassium strengthened the Co–NO bond, impeding NO desorption, even above 400 °C. Graphical
      PubDate: 2017-09-08
      DOI: 10.1007/s10562-017-2180-8
       
  • DBU-Based Dicationic Ionic Liquids Promoted Esterification Reaction of
           Carboxylic Acid with Primary Chloroalkane Under Mild Conditions
    • Abstract: A series of DBU-based (DBU = 1, 8-diazabicyclo [5.4.0] undec-7-ene) dicationic ionic liquids with different anions were successfully synthesized by the reaction of DBU and 1, 6-dichlorohexane. Therein, the dicationic ionic liquid 1, 1′-(hexane-1, 6-diyl)bis(1, 8-diazabicyclo [5.4.0]undec-7-enium) dichlorine (IL-1) was successfully employed as an efficient catalyst in esterification reaction of carboxylic acids with primary chloroalkanes under mild conditions without any additional basic reagents. Moreover, the optimum catalyst could be efficiently reused for five times without any significant change on the catalytic effect. The improved protocol is not only efficient, but also green and pollution-free. Graphical
      PubDate: 2017-09-08
      DOI: 10.1007/s10562-017-2184-4
       
  • Soot Oxidation Activity of Redox and Non-Redox Metal Oxides Synthesised by
           EDTA–Citrate Method
    • Abstract: In the present study, redox (CeO2, SnO2, Pr6O11 and Mn3O4) and non-redox (Gd2O3, La2O3 ZrO2 and HfO2) metal oxides were successfully synthesised using the EDTA–citrate complexing method and tested for soot oxidation activity. The characterization of the metal oxides is carried out using FTIR, XRD, BET surface area, pore volume analyser, SEM and TEM. The redox nature and metal–oxygen bond information of the metal oxides are obtained from XPS analysis. In redox metal oxides, three critical parameters [lattice oxygen binding energy, reduction temperature and Δr (ionic size difference of the corresponding metal oxide oxidation states)] govern the soot oxidation activity. Among the redox metal oxide samples, Mn3O4 and Pr6O11 samples showed lower binding energy for oxygen (Oβ—529.4, 528.9 eV respectively), lower reduction temperature (Tα—317 and 512 °C respectively) and have smaller Δr value (9 pm and 17 pm respectively). Thus, displayed a better soot oxidation activity (T50 = 484 and 482 °C respectively) than compared to other redox metal oxides. Among the non-redox metal oxides, HfO2 sample displayed higher BET surface area (21.06 m2/g), lattice strain (0.0157), smaller ionic radius (58.2 pm) and higher relative surface oxygen ratio (58%) and thus resulted in a significantly better soot oxidation activity (T50 = 483 °C) than compared to other non-redox metal oxides. Graphical
      PubDate: 2017-09-08
      DOI: 10.1007/s10562-017-2181-7
       
  • Erratum to: Preparation of Hydrotalcite–Hydroxyapatite Material and Its
           Catalytic Activity for Transesterification of Soybean Oil
    • Authors: Henrique Brasil; Patrícia Pereira; José Corrêa; Luis Nascimento; Victor Rumjanek; Vitor Almeida; Natasha Coral; Elizabeth Rodrigues
      PubDate: 2017-09-07
      DOI: 10.1007/s10562-017-2177-3
       
  • Nano Copper(0)-Stabilized on Alumina: Efficient and Recyclable
           Heterogeneous Catalyst for Chemoselective Synthesis of 1,2-Disubstituted
           Benzimidazoles and Quinoxalines in Aqueous Medium
    • Authors: Jaya Pogula; Soumi Laha; Pravin R. Likhar
      Abstract: The present communication elicits the use of copper nanoparticles on aluminium oxide derived from Cu–Al hydrotalcite as a heterogeneous catalyst in the green and operationally simple approach for the synthesis of selective 1,2-disubstituted benzimidazoles and quinoxaline. Wide ranges of substituted o-phenylenediamines and aldehydes or α-bromo ketones were used to achieve the desired products using water as the reaction medium. The recoverability and reusability of the catalyst are the significant features in this eco-friendly green protocol. Graphical A simple and efficient process for the synthesis of benzimidazoles and quinoxaline in presence of Cu(0)/Al2O3 catalyst at room temperature is described.
      PubDate: 2017-09-07
      DOI: 10.1007/s10562-017-2166-6
       
  • Photocatalytic Reduction of CO 2 Using Titanium-Substituted and
           Fluorine-Doped Titanium-Substituted Hydroxyapatite as Photocatalysts
    • Authors: Xuejiao Wang; Xiang Feng; Jing Shang; Ying Jin; Caixia Zhang
      Abstract: Reduction of carbon dioxide (CO2) using semiconductor photocatalysts has aroused a great deal of attention, and most studies have applied titanium dioxide (TiO2) and modified TiO2 as photocatalysts in this process. In this study, we used Ti-substituted hydroxyapatite (TiHAP), an emerging photocatalytic material with a high adsorption capacity, as a novel photocatalyst to investigate the photocatalytic reduction of gaseous CO2 under ultraviolet (UV) light with water as the reductant. Powders of TiHAP and fluorine-doped TiHAP (TiFHAP) were prepared using a hydrothermal method, and their morphologies, structure, and composition were characterized via transmission electron microscopy, X-ray diffraction, UV–Vis spectrophotometry, photoluminescence fluorescent spectrometry, and X-ray photoelectron spectroscopy. Compared to commercial P25-TiO2, TiHAP provided enhanced photocatalytic reduction of CO2 into carbon monoxide (CO) and methane (CH4), due to its higher conduction band position. Fluorine doping further facilitated the reaction activity of TiFHAP, with 5.6 wt% fluorine providing the optimal results. The relative humidity of the reaction system had a substantial effect on the CO2 reduction process. Higher relative humidity ensured greater participation of protons, which was confirmed by the increasing formation rates of CO and CH4. Furthermore, a high CO formation rate always accompanied high CH4 formation selectivity, indicating that deep CO2 reduction can proceed rapidly over TiFHAP samples. This study supports the idea that TiHAP may be a novel and efficient photocatalyst for the reduction of CO2. Graphical
      PubDate: 2017-09-07
      DOI: 10.1007/s10562-017-2175-5
       
  • Effect of SO 2 on Catalytic CO Oxidation Over Nano-Structured, Mesoporous
           Au/Ce 1−x Zr x O 2 Catalysts
    • Authors: Dolly Valechha; Suresh Kumar Megarajan; Anis Hamza Fakeeha; Ahmed S. AL-Fatesh; Nitin K. Labhasetwar
      Abstract: A series of nano-structured, mesoporous Au/Ce1 − xZrxO2 type catalysts were synthesized by first synthesizing Ce1−xZrxO2 type of support with different degree of Zr substitutions and following sol–gel route. One weight percent of Au was incorporated on these supports using deposition–precipitation method. These synthesized catalysts were characterized in detail by various techniques, and evaluated for their CO oxidation activity. Effect of SO2 poisoning on catalytic CO oxidation activity was also investigated in detail. It was observed that the catalytic activity for CO oxidation reaction depends on the Ce/Zr molar ratio. The effect of SO2 on CO oxidation was less prominent for the Zr incorporated ‘Au/Ce0.8Zr0.2O2 (ACZ0.2)’ as compared to bare ‘Au/CeO2 (AC)’ catalyst. In case of ACZ0.2, the activity remains quite stable even after 5 h of SO2 exposure, however, after 12 and 18 h, the activity decreases to 62 and 55%, respectively. Whereas AC catalyst shows rapid decline in catalytic activity from the first hour of SO2 exposure, and continue to decline significantly to 35 and 18% after 12 and 18 h of SO2 exposure, respectively. Multiple regeneration studies of both bare and Zr incorporated catalysts show pronounced improvement/regain in catalytic activity. Graphical
      PubDate: 2017-09-07
      DOI: 10.1007/s10562-017-2182-6
       
  • Effect of Microwave Irradiation on the Catalytic Activity of Palladium
           Supported Catalysts in the One-Step Isomerisation of Cinchona Alkaloids to
           Δ 3,10 -Isobases
    • Authors: Teodozja M. Lipińska; Dominika Borowska; Natalia Swędra; Katarzyna Trochim
      Abstract: Efficiency of palladium solid supported (Pd/SS) catalysts for one-step isomerisation of the side chain of four natural Cinchona alkaloids have been explored under controlled microwave heating in the green media (50% aqueous ethanol or ethylene glycol with HCl). Conversion progress and products purity was monitored by TLC and by 1H NMR spectrometry. Final conversion is dependent on the support (Al2O3, C or BaSO4), reaction time and temperature. Very good results: high yields and purity of (Z/E) Δ3,10-isomers were obtained from quinine and quinidine with 10% Pd/BaSO4 as the catalyst, which is less effective for isomerisation of cinchonine and cinchonidine. Enhancing energy efficiency can be possible when the responsive support selective absorbs of microwave energy, which is translated to the palladium giving acceleration of the formation and disintegration of the transition state leading to Δ3,10-isomers. Graphical
      PubDate: 2017-09-07
      DOI: 10.1007/s10562-017-2169-3
       
  • MMZ NiY -Catalyzed Tsuji–Trost Type of Reaction: A Selective Mono/Bis
           Allylation of Dicarbonyl Compounds
    • Authors: Samuthirarajan Senthilkumar; Cheirmakani Thangapriya; Raman Alagumurugayee; Mayilvasagam Kumarraja
      Abstract: An alternative method to Pd-catalyzed Tsuji–Trost reaction is developed and it provides a simpler route for the selective synthesis of a broad range of mono-/bis-allylated and cinnamylated 1,3-dicarbonyl compounds using MMZNiY catalyst at room temperature. Product selectivity can be controlled by the proper choice of catalyst. The catalyst was also well characterized by SEM, TEM, HRTEM, EDAX and X-ray analysis. Other advantages of catalyst like its ease of preparation, functional tolerance and its reusability are also highlighted. Graphical
      PubDate: 2017-09-05
      DOI: 10.1007/s10562-017-2185-3
       
  • Diols Production From Glycerol Over Pt-Based Catalysts: On the Role Played
           by the Acid Sites of the Support
    • Authors: Alberto Villa; Maela Manzoli; Floriana Vindigni; Lidia E. Chinchilla; Gianluigi A. Botton; Laura Prati
      Abstract: A series of 1 wt% AuPt (6:4) catalysts were prepared by sol immobilization using acidic [TiO2, H-Mordenite, SiO2, MCM-41, sulphated ZrO2 (S-ZrO2)] and one basic (MgO) oxide supports. A careful characterization of the catalyst was performed by HRTEM and FTIR spectroscopy. EDX analysis showed that on all catalysts only alloyed AuPt nanoparticles are present, but the final size of AuPt particles is significantly affected by the support. Indeed, on TiO2 the mean AuPt nanoparticles diameter is 3.7 nm, whereas for all the remaining supports, larger AuPt nanoparticles with diameter of 6–7.5 nm were obtained. AuPt catalysts result very active in catalyzing the liquid phase hydrogenolysis of glycerol to 1,2-propandiol (68% conversion after 16 h) and 90% selectivity with ethylene glycol, 1-propanol and 2-propanol as main by-products. The role of the support has been highlighted in terms of acidic properties. The medium strength of Lewis acid sites of TiO2 leads to the best performance in terms of activity, selectivity and stability of the catalytic system. Graphical
      PubDate: 2017-09-05
      DOI: 10.1007/s10562-017-2183-5
       
  • Controlled Synthesis of Mesoporous Nitrogen-Doped Carbon Supported Ni-Mo
           Sulfides for Hydrodesulfurization of Dibenzenethiophene
    • Authors: Zhenwei Zhang; Xingmao Jiang; Jianheng Hu; Chuanjun Yue; Jintao Zhang
      Abstract: Mesoporous nitrogen-doped carbon was synthesized in a controlled manner by a modified deep eutectic solvent method using silica nanoparticles as templates. Various amounts of urea and glucose, which contain hydrogen acceptor and hydrogen bond donor groups were heated and stirred to form homogeneous liquid precursors like deep eutectic solvents, and nitrogen element was uniformly dispersed on an atom scale. Ni-Mo sulfides supported on mesoporous carbon with varying N dopping exhibit excellent hydrodesulfurization (HDS) catalytic performance such as high conversion and good recycling stability in the HDS of dibenzenethiophene. Further investigation showed that a suitable N content in the carbon support enhance the HDS properties and the HDS conversion could reach up to 96%. Graphical
      PubDate: 2017-09-04
      DOI: 10.1007/s10562-017-2178-2
       
 
 
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