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  Subjects -> ENGINEERING (Total: 2410 journals)
    - CHEMICAL ENGINEERING (206 journals)
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    - ENGINEERING (1268 journals)
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ENGINEERING (1268 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 3)
ACS Nano     Hybrid Journal   (Followers: 280)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 3)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 14)
Advances in Polymer Science     Hybrid Journal   (Followers: 44)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 45)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 10)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 24)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 9)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering     Hybrid Journal   (Followers: 1)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Open Access   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Bitlis Eren University Journal of Science and Technology     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 43)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 6)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 22)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Hybrid Journal   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 15)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 287)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 217)
Composites Part B : Engineering     Hybrid Journal   (Followers: 253)
Composites Science and Technology     Hybrid Journal   (Followers: 196)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 7)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 34)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)

        1 2 3 4 5 6 7 | Last

Journal Cover
Catalysis Letters
Journal Prestige (SJR): 0.73
Citation Impact (citeScore): 2
Number of Followers: 2  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-879X - ISSN (Online) 1011-372X
Published by Springer-Verlag Homepage  [2348 journals]
  • Dry Reforming of Methane at High Pressure in a Fixed-Bed Reactor with
           Axial Temperature Profile Determination
    • Authors: Lukas Tillmann; Jonas Schulwitz; André van Veen; Martin Muhler
      Pages: 2256 - 2262
      Abstract: A continuously operated flow setup with fixed-bed reactor and online gas analysis enabled kinetic investigations of catalysts for the carbon dioxide reforming of methane under industrially relevant conditions at temperatures up to 1000 °C and at pressures up to 20 bar. A coaxial reactor design consisting of an inner- and an outer highly alloyed steel tube allowed obtaining axial temperature profiles by means of a moveable thermocouple. A NiAl2O4-based catalyst was tested at 820 °C and pressures of 1, 10 or 20 bar and compared to a conventional Ni catalyst used for steam reforming of methane. A significant cold spot was detected even when using only 10 mg of catalysts diluted in 1 g of silicon carbide. The specifically designed NiAl2O4/Al2O3 dry reforming catalyst with a high dispersion of the active Ni0 phase was found to be far superior to the conventional steam reforming catalyst. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2453-x
      Issue No: Vol. 148, No. 8 (2018)
  • Photocatalytic Coupling of Methanol and Formaldehyde into Ethylene Glycol
           with High Atomic Efficiency
    • Authors: Yonghui Fan; Jingxian Bao; Lei Shi; Shenggang Li; Yongwu Lu; Hongjiang Liu; Hui Wang; Liangshu Zhong; Yuhan Sun
      Pages: 2274 - 2282
      Abstract: A mild strategy to form ethylene glycol via photocatalytic C–C coupling of methanol and formaldehyde was developed with high atomic efficiency over M/TiO2 under UV-light irradiation. The presence of both methanol and formaldehyde significantly enhanced the formation of ethylene glycol with selectivity of 80%. A radical reaction mechanism for the photocatalytic C–C coupling of methanol and formaldehyde into ethylene glycol was proposed based on electron spin resonance and isotope labeling experiment as well as quantum chemical calculations. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2465-6
      Issue No: Vol. 148, No. 8 (2018)
  • Photocatalytic Reduction of CO 2 to CH 3 OH Coupling with the Oxidation of
           Amine to Imine
    • Authors: Tian Yang; Qiming Yu; Hongming Wang
      Pages: 2382 - 2390
      Abstract: The photocatalytic reduction of CO2 to organic molecules is one promising approache for both decreasing CO2 concentration in the atmosphere and storing energies. However, most of the photocatalytic reduction of CO2 cannot avoid the utilization of sacrificial agents, which are not atomic economy and restricts the practical application of the photocatalytic reduction of CO2. In this contribution, an atomic economy photocatalytic reduction of CO2 to CH3OH coupling with the oxidation of amine to imine by Cu/TiO2 was reported, which can avoid using the sacrificial agents in the reaction systems. CO2 was reduced to CH3OH by photo-induced electrons; meanwhile benzylamine was selected as the reductant to react with photo-generated holes and converted into imine with high selectivity. The results showed that the maximum conversion of benzylamine to imine is 88.7% with selectivity of 98%, and the highest yield of CH3OH is 961.4 µmol g−1 using ca.0.5 wt% Cu/TiO2 as the catalyst. And also, the reaction mechanism was also investigated by DFT calculation, which would give a detailed explanation for the reaction process. Graphical Schematic illustration is that maximum conversion of benzylamine to imine is 88.7% with selectivity of 98%, and the highest yield of CH3OH is 961.4 μmol g−1 using ca.0.5 wt% Cu/TiO2 as the catalyst
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2412-6
      Issue No: Vol. 148, No. 8 (2018)
  • Bipyridine-Proline Grafted Silicas with Different Mesopore Structures:
           Their Catalytic Performance in Asymmetric Aldol Reaction and Structure
    • Authors: Xu He; Shiyang Bai; Jihong Sun; Yajing Zhang; Hongwu Zhao; Xia Wu
      Pages: 2408 - 2417
      Abstract: A series of immobilized bipyridine-proline based on mesoporous silica with different structures were synthesized via grafting followed by coordination method. All catalysts were used in asymmetric aldol reaction of cyclohexanone with 4-nitrobenzaldehyde, and their catalytic performance including activities and stabilities have been investigated. The results indicated that the pore structure, morphology, and even the particle dispersity all showed the effects on the catalytic performance of immobilized catalysts. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2421-5
      Issue No: Vol. 148, No. 8 (2018)
  • Facilely Prepared N-Doped Graphene/Pt/TiO 2 as an Efficient Anode for
           Acetaminophen Degradation
    • Authors: Rong Sun; Wan Huang; Qian Zhang; Jun-ming Hong
      Pages: 2418 - 2431
      Abstract: This study developed nitrogen-doped graphene/Pt/TiO2 (N-GN/Pt/TiO2) as anode to effectively degrade aminophenol (APAP) in electrocatalytic process. Due to the different physicochemical properties of graphene with various N species loading, the efficiency of catalysts was novelty discussed. The morphology, N-doped content/species, and the graphene defects of the catalyst were analyzed by TEM, FTIR, XPS, EA, and Raman spectroscopy. The results show that the doping morphology of the N atoms gradually shifted from pyridinic N and pyrrolic N to graphitic N with increased hydrothermal time, in order to decrease the defect degrees and redox activity. However, the conductivity of material increased with the graphitic N generation. The best APAP degradation efficiency (100% with 20 mA, 1 g/L NaCl, and initial pH 3.0) can be achieved with 1.5-N-GN/Pt/TiO2 (mainly pyridinic N and pyrrolic N doping). A detailed investigation was conducted to determine the oxidation intermediates of APAP using GC-MS analysis. Finally, a possible degradation pathway was proposed. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2466-5
      Issue No: Vol. 148, No. 8 (2018)
  • Oxidative Removal of Organo-sulfur Species via H 2 O 2 Oxidation Catalyzed
           by Lacunary Keggin 11-tungstophosphates
    • Authors: Han Wang; Rui Wang; Yongqiang Zhang; Shuaiyong Dou; Silchenkova Olga; Korchak Vladimir
      Pages: 2501 - 2509
      Abstract: The lacunary Keggin 11-tungstophosphates were evaluated as catalysts for the oxidation of dibenzothiophene with hydrogen peroxide as oxidant in normal octane/acetonitrile biphasic system. The Na5[PW11O39Ni] exhibited good catalytic activity with the desulfurization efficiency above 99.5%. The key factors affecting the reaction, including amount of catalyst, O/S molar ratio, catalyst dosage and initial sulfur content, were investigated, whereby the favorable conditions were determined. The presence and the oxidative effect of the peroxo-heteropoly species in the oxidative reaction were determined in the contrast experiments. Moreover, the Na5[PW11O39Ni] catalyst was confirmed to have a high potential for deep desulfurization of diesel oil. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2433-1
      Issue No: Vol. 148, No. 8 (2018)
  • Fenton-Reaction-Derived Fe/N-Doped Graphene with Encapsulated Fe 3 C
           Nanoparticles for Efficient Photo-Fenton Catalysis
    • Authors: Xiaoqin Huang; Bomin Feng; Yanli Niu; Lei Zhao; Weihua Hu
      Pages: 2528 - 2536
      Abstract: An excellent Fenton catalyst requires high activity, good stability and also convenience in separation for recycling. In this work we report Fenton-reaction-derived iron/nitrogen-doped graphene with encapsulated iron carbide nanoparticles (Fe3C@Fe/N-G) as an excellent heterogeneous Fenton catalyst. It was synthesized via Fe3+/H2O2-Fenton-reaction-driven oxidative polymerization of dopamine on graphene oxide surface, followed by carbonization process. Detailed characterizations unveil that as-prepared Fe3C@Fe/N-G is made up of Fe/N-doped graphene sheets with encapsulated dense and homogeneous Fe3C nanoparticles. Due to its unique microstructure and rationally-combined components, this catalyst exhibits appealing catalytic performance including high activity and excellent recoverability in photo-assisted Fenton reaction. This work may offer a valuable route to rational design and controllable synthesis of high-performance transition metal-based catalysts. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2425-1
      Issue No: Vol. 148, No. 8 (2018)
  • Novel Synthesis of Cu@ZnO and Ag@ZnO Nanocomposite via Green Method: A
           Comparative Study for Ultra-Rapid Catalytic and Recyclable Effects
    • Authors: G. Manjari; S. Saran; Suja P. Devipriya; A. Vijaya Bhaskara Rao
      Pages: 2561 - 2571
      Abstract: The use of metal immobilized/decorated nanocomposites as catalyst were usually used in environmental pollution remediation and protection, industrial production, and biomedical applications. Finding a new and efficient method for the green synthesis of metal nanoparticles immobilized over porous material is of great interest. Synthesis of more stable and outstanding Cu@ZnO and Ag@ZnO nanocomposite for nitro aromatic compound reduction were reported in this work. The metal nanoparticles and nanocomposite was characterized using UV–Vis spectrum, XRD, Raman spectra, TEM, SAED, EDS, and FTIR techniques. The immobilized Cu and Ag nanoparticles are with an average size of 18 and 12 nm on ZnO surface respectively. Comparatively, the Cu/ZnO and Ag/ZnO nanocomposite acted as an efficient heterostructure catalyst in the reduction of p-nitrophenol to p-aminophenol than pure Cu and Ag nanoparticles with more stability up to six cycles. The characterization results inferred the synergic effect between metal and porous material played important role in its activity and stability of Cu@ZnO and Ag@ZnO nanocomposite more than pure Cu and Ag nanoparticles. It is proposed that Cu and Ag immobilized ZnO applicable in various catalytic activities were achieved. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2435-z
      Issue No: Vol. 148, No. 8 (2018)
  • Manganes-Porphyrin as Efficient Enantioselective Catalyst for Aerobic
           Epoxidation of Olefins
    • Authors: Afsaneh Farokhi; Kayhaneh Berijani; Hassan Hosseini-Monfared
      Pages: 2608 - 2618
      Abstract: A chiral manganese porphyrin, [Mn(TCPP-Ind)Cl], was synthesized using cis-1-amino-2-indanol substituent. It showed remarkable catalytic activity and enantioselectivity in the epoxidation of olefins with O2/RCHO. Terminal olefins and styrene derivatives were successfully oxidized (> 99% ee). TON of 73,000 was achieved in the epoxidation of α-methylstyrene after five times recycling. Graphical
      PubDate: 2018-08-01
      DOI: 10.1007/s10562-018-2447-8
      Issue No: Vol. 148, No. 8 (2018)
  • Cobalt(II)–Salen Complexes for Photocatalytic Hydrogen Production in
           Noble Metal-Free Molecular Systems
    • Authors: Cheng-Bo Li; Peng Gong; Ying Yang; Hong-Yan Wang
      Abstract: Developing cost-effective hydrogen-production systems is always appealing in order to satisfy the future energy request. Here, two Co(II)–salen complexes 1 and 2 were firstly introduced into homogeneous photocatalytic hydrogen-evolution systems. Based on these two cobalt complexes, we developed noble-metal-free hydrogen production systems using xanthene dyes [such as Disodium salts of Eosin Y (EY2−), Rose Bengal (RB2−) and Fluorescein (Fl2−)] as photosensitizers and trimethylamine (TEA) as sacrificial donor. Complex 1 presented the best catalytic performance for hydrogen production with a TON of 319 based on catalyst within 9 h irradiation, which is superior to other cobalt complexes in noble-metal-free systems. UV–Vis spectra studies demonstrate that EY2− suffered quick decomposition, especially under the presence of complex 1, which should be responsible for hydrogen-production deactivation. The thermodynamically favorable photo-induced electron transfer from 3*EY2− to complex 1 was supported by investigations involving fluorescence quenching and cyclic voltammetry studies. However, the immediate color change (within seconds) as the hydrogen production systems exposed under the irradiation indicates that EY2− firstly suffered dehalogenation which functions as the real active dyes. Graphical
      PubDate: 2018-08-11
      DOI: 10.1007/s10562-018-2509-y
  • Palladium Niacin Complex Immobilized on Starch-Coated Maghemite
           Nanoparticles as an Efficient Homo- and Cross-coupling Catalyst for the
           Synthesis of Symmetrical and Unsymmetrical Biaryls
    • Authors: Elham Rezapour; Maasoumeh Jafarpour; Abdolreza Rezaeifard
      Abstract: In this work, catalytic efficiency of palladium niacin complex immobilized on starch-coated maghemite nanoparticles successfully exploited for homo- and cross-coupling reactions such as Suzuki–Miyaura, Sonogashira-, and Ullmann coupling reactions. The solid catalyst characterized by different methods such as FT-IR, TGA, XPS, EDS and ICP-AES. TEM images revealed a nanosize structure for catalyst and vibrating sample magnetometer (VSM) demonstrated its magnetic property. The reactions proceeded well in the absence of commonly used additives with high selectivity. Potential reusability of magnetically separable palladium catalyst and performing the reactions at environmentally conditions are notable features of the present methods making great potential for practical applications. Graphical
      PubDate: 2018-08-11
      DOI: 10.1007/s10562-018-2513-2
  • Early Transition Metal Doped Tungstite as an Effective Catalyst for
           Glucose Upgrading to 5-Hydroxymethylfurfural
    • Authors: Jan J. Wiesfeld; Nico A. J. M. Sommerdijk; Emiel J. M. Hensen
      Abstract: Glucose valorization to 5-hydroxymethylfurfural (HMF) remains challenging in the transition towards renewable chemistry. Lewis acidic tungstite is a viable, moderately active catalyst for glucose dehydration to HMF. Literature reports a multistep mechanism involving Lewis acid catalyzed isomerization to fructose, which is then dehydrated to HMF by Brønsted acid sites. Doping tungstite with titanium and niobium improves activity by optimizing the ratio between Lewis and Brønsted acid sites. Graphical
      PubDate: 2018-08-10
      DOI: 10.1007/s10562-018-2483-4
  • Hydrogenation of Rosin to Hydrogenated Rosin by Ru/Fe 3 O 4 @C Magnetic
    • Authors: Yue Liu; Xinping Wang; Chao Chen; Lu Li; Hailong Yu; Qiong Wu; Congxia Xie; Shitao Yu; Shiwei Liu
      Abstract: Fe3O4@C supported ultrasmall and highly monodisperse ruthenium (Ru) nanoparticles (Ru/Fe3O4@C) were prepared as novel nanocatalysts for hydrogenation reactions. The catalysts displayed high activity for the hydrogenation of rosin to form hydrogenated rosin with extraordinary selectivity. The role of controlled carbon size on the catalytic properties of the catalysts was studied. The Ru/Fe3O4@C catalyst can be easily separated from the organic solvent by applying an external magnetic field and the separated Ru/Fe3O4@C can simply and efficiently used in ten consecutive runs without significant decrease in activity. Significantly, Ru/Fe3O4@C nanocatalysts showed a wide substrate scope for hydrogenation reactions under mild conditions. Graphical
      PubDate: 2018-08-07
      DOI: 10.1007/s10562-018-2512-3
  • Synthesis of Benzaldehyde and Benzoic Acid by Selective Oxidation of
           Benzyl Alcohol with Iron(III) Tosylate and Hydrogen Peroxide: A
           Solvent-Controlled Reaction
    • Authors: Yang Zhao; Chao Yu; Shutian Wu; Wenli Zhang; Weilan Xue; Zuoxiang Zeng
      Abstract: Solvent effect plays a significant role in manipulating the chemical reactivity. As shown herein, selective oxidation of benzyl alcohol (BnOH) by 30 wt% hydrogen peroxide (H2O2) with iron(III) tosylate is a solvent-controlled reaction. The use of different solvents, dissimilar products can be obtained in the reaction: in chloroform, quantitative conversion to benzaldehyde (BnH) is achieved; while high yield is obtained when producing benzoic acid (BA) in acetonitrile. This phenomenon is related not only to the polarity of organic solvents, but also to the interaction energies between BnH and different solvents molecules. Molecular dynamics (MD) calculated by Materials Studio (Accelrys Software Inc., US) show a strong interaction between BnH and chloroform molecules, which means BnH (generated from the oxidation of BnOH) can be effectively protected by chloroform so as to prevent further oxidation to BA. Moreover, a free radical catalytic mechanism is verified in the oxidation of BnOH with H2O2 catalyzed by Fe(OTs)3·6H2O by a poisoning tests using BQ as the radical scavenger. Graphical
      PubDate: 2018-08-07
      DOI: 10.1007/s10562-018-2515-0
  • Determination of Activation Energy and Ping-Pong Kinetic Model Constants
           of Enzyme-Catalyzed Self-Epoxidation of Free Fatty Acids using
    • Authors: Fatemeh Mashhadi; Alireza Habibi; Kambiz Varmira
      Abstract: This work reports bioconversion of unsaturated free fatty acids present in soapstock, inherent waste of edible oil manufacture, to the epoxidized fatty acids using Candida rugose lipase in a micro-reactor. Activation energy of the epoxidation reaction was found to be 32.27 kJ mol−1 while the enzyme deactivation was observed at higher temperature than 35 °C with an activation energy of 91.18 kJ mol−1. The low hydrodynamic retention time in the micro-reactor provides a proper condition to measure of initial rates of the enzymatic reaction. The kinetics study was performed at ten different molar ratios of H2O2/C=C, and constants of the Ping-Pong bi bi model were estimated as follows: the maximum specific enzyme activity (Vmax) of 1.453 × 105 mM min−1 genzyme−1, dissociation constant for enzyme-FFA complex (KA) of 58.83 mM genzyme−1, Michaelis constant for FFAs (KmA) of 1.382 × 103 mM genzyme−1, Michaelis constant for hydrogen peroxide (KmB) of 3.279 × 106 mM genzyme−1, and the deactivation constant due to hydrogen peroxide (KIB) of 59.25 mM genzyme−1. The cross-linked enzyme aggregate technology provided a simple method to produce the robust biocatalyst for this bioconversion where more than 89% of original activity was maintained after 9 cycles in the micro-reactor. Graphical
      PubDate: 2018-08-06
      DOI: 10.1007/s10562-018-2503-4
  • Impregnated and Co-precipitated Pd–Ga 2 O 3 , Pd–In 2 O 3 and Pd–Ga
           2 O 3 –In 2 O 3 Catalysts: Influence of the Microstructure on the CO 2
           Selectivity in Methanol Steam Reforming
    • Authors: Christoph Rameshan; Harald Lorenz; Marc Armbrüster; Igor Kasatkin; Bernhard Klötzer; Thomas Götsch; Kevin Ploner; Simon Penner
      Abstract: To focus on the influence of the intermetallic compound—oxide interface of Pd-based intermetallic phases in methanol steam reforming (MSR), a co-precipitation pathway has been followed to prepare and subsequently structurally and catalytically characterize a set of nanoparticulate Ga2O3- and In2O3-supported GaPd2 and InPd catalysts, respectively. To study the possible promoting effect of In2O3, an In2O3-doped Ga2O3-supported GaPd2 catalyst has also been examined. While, upon reduction, the same intermetallic compounds are formed, the structure of especially the Ga2O3 support is strikingly different: rhombohedral and spinel-like Ga2O3 phases, as well as hexagonal GaInO3 and rhombohedral In2O3 phases are observed locally on the materials prior to methanol steam reforming by high-resolution transmission electron microscopy. Overall, the structure, phase composition and morphology of the co-precipitated catalysts are much more complex as compared to the respective impregnated counterparts. However, this induces a beneficial effect in activity and CO2 selectivity in MSR. Both Ga2O3 and In2O3 catalysts show a much higher activity, and in the case of GaPd2–Ga2O3, a much higher CO2 selectivity. The promoting effect of In2O3 is also directly detectable, as the CO2 selectivity of the co-precipitated supported Ga2O3–In2O3 catalyst is much higher and comparable to the purely In2O3-supported material, despite the more complex structure and morphology. In all studied cases, no deactivation effects have been observed even after prolonged time-on-stream for 12 h, confirming the stability of the systems. Graphical The presence of a variety of distinct supported intermetallic InPd and GaPd2 particle phases is not detrimental to activity/selectivity in methanol steam reforming as long as the appropriate intermetallic phases are present and they exhibit optimized intermetallic-support phase boundary dimensions.
      PubDate: 2018-08-03
      DOI: 10.1007/s10562-018-2491-4
  • Selective Production of Terminally Unsaturated Methyl Esters from Lactones
           Over Metal Oxide Catalysts
    • Authors: Zachary J. Brentzel; Madelyn R. Ball; James A. Dumesic
      Abstract: Metal oxide catalysts were studied for their selectivity for the production of a terminally unsaturated methyl ester, methyl 5-hexenoate (M5H), from a 6 carbon, 6-membered ring lactone, δ-hexalactone (DHL). A 15 wt% Cs/SiO2 catalyst had a selectivity of 55% to M5H. This selectivity was the highest of the metal oxide catalysts studied, which were Cs/SiO2, MgO, SrO, CeO2, ZrO2, Ta2O5, MgAl2O4, and a Mg–Zr mixed oxide. The Cs/SiO2 catalyst was utilized for the ring-opening of γ-valerolactone (GVL), a 5 carbon, 5-membered ring lactone. The catalyst was 88% selective to the terminally unsaturated methyl ester, methyl 4-pentenoate (M4P). Weight hourly space velocity studies determined that the unsaturated ester distributions remained constant and no C=C double bond isomerization occurred. Liquid phase transesterification reactions with DHL and methanol and nuclear magnetic resonance spectroscopy confirmed that DHL undergoes ring-opening transesterification to produce an ω-1 hydroxy methyl ester, methyl 5-hydroxyhexanoate (M5HH). Liquid phase transesterification reactions and thermochemistry calculations established that the equilibrium for GVL transesterification with methanol was favored towards the ring-closed lactone instead of the ring-opened hydroxy ester because of the decreased ring strain of GVL compared to DHL. The difference in terminally unsaturated methyl ester selectivity between GVL and DHL manifests from the difference in ring-strain energy. DHL passes through the M5HH intermediate as a result of greater ring strain, while the production of M4P from GVL most likely occurs through a direct, concerted mechanism. Graphical
      PubDate: 2018-08-03
      DOI: 10.1007/s10562-018-2507-0
  • Ferrosilicate-Based Heterogeneous Fenton Catalysts: Influence of
           Crystallinity, Porosity, and Iron Speciation
    • Authors: E. V. Parkhomchuk; J. García-Aguilar; K. A. Sashkina; A. Berenguer-Murcia; D. Cazorla-Amorós; R. I. Dralyuk; D. O. Shestakova; A. B. Ayupov; I. G. Danilova; V. N. Parmon
      Abstract: Different ferrosilicate samples have been prepared with varying degrees of crystallinity, porous texture, and speciation of the Fe sites by both hydrothermal and sol–gel procedures: Fe-silicalite-1 with microcrystals (2–10 µm) and nanocrystals (180 nm), Fe-containing composite material consisting of silicalite-1 and amorphous silica, and two samples of mesoporous Fe-containing amorphous silica Fe–SiO2. The resulting solids have been tested for their potential as organic pollutants removal under Fenton-like conditions in heterogeneous catalytic wet peroxide oxidation of phenol and clarithromycin lactobionate. Our results indicate that the three aforementioned parameters show a strong interplay towards the abatement of pollutants in liquid phase. Thus, samples with high crystallinity show an improved performance in the oxidation of organic contaminants over amorphous samples in which the Fe speciation is very well controlled. Graphical
      PubDate: 2018-08-03
      DOI: 10.1007/s10562-018-2496-z
  • Water Adsorption and Decomposition on Co(0001) Surface: A Computational
    • Authors: Minhua Zhang; Heyuan Huang; Yingzhe Yu
      Abstract: Water adsorption and decomposition on the Co(0001) surface has been systematically studied by spin-polarized density functional theory calculations and atomic thermodynamics. H2O adsorption mechanism has been analyzed by partial density of states. The possible structure of adsorbed H2O molecules comprised of monomer-hexamer have been investigated and the phase diagram shows that only two configurations are stable thermodynamically: clean Co(0001) surface and H2O hexamer adsorption. The competition between the ability of a H2O molecule to bond with the substrate and its ability to act as a H-bond acceptor leads to the symmetry-breaking bond alteration in the hexamer structure. In addition, the interaction among adsorbed H2O molecules can help stabilize adsorption configurations by forming H-bonds. Presence of O species has a great influence on the decomposition of water and can significantly lower the activation barrier of H–OH bond cleavage. Graphical
      PubDate: 2018-08-02
      DOI: 10.1007/s10562-018-2508-z
  • A New Bi-Based Oxychloride Bi 4 Ti 0.5 W 0.5 O 8 Cl as a Photocatalyst
    • Authors: Siqi Zhen; Lei Zhu; Zhengchao Dong; Lele Fan; Baolin Wang; Qinfang Zhang
      Abstract: Synthesis of new mixed anion compounds under visible light has been considered as an elegant strategy of photocatalyst development for efficient solar light harvesting applications. Through combined experimental and theoretical studies, we show that a new single layer Sillen–Aurivillius perovskite Bi4Ti0.5W0.5O8Cl is a good photocatalyst under visible light. This compound prepared by a solid-state reaction method has an energy gap of 2.36 eV and the visible-light-driven photocatalytic activities for degrading Rhodamine B are much better than Bi4NbO8Cl. We conclude from density functional theory calculations that its promising water-splitting application is due to its direct band gap and more stronger hybridization between Bi-6s and O-2p orbitals than Bi4NbO8Cl. Graphical
      PubDate: 2018-07-02
      DOI: 10.1007/s10562-018-2436-y
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