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  Subjects -> ENGINEERING (Total: 2298 journals)
    - CHEMICAL ENGINEERING (192 journals)
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    - ENGINEERING (1209 journals)
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ENGINEERING (1209 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: 7)
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: 252)
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: 9)
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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: 26)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
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Advances in Heat Transfer     Full-text available via subscription   (Followers: 22)
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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)
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Advances in Remote Sensing     Open Access   (Followers: 40)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 5)
AIChE Journal     Hybrid Journal   (Followers: 32)
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: 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: 17)
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: 8)
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: 18)
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   (Followers: 1)
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: 5)
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)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 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: 4)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 34)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
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: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 1)
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: 24)
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: 4)
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: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 27)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 270)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 195)
Composites Part B : Engineering     Hybrid Journal   (Followers: 276)
Composites Science and Technology     Hybrid Journal   (Followers: 191)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 29)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 6)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 32)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 7)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
Corrosion Series     Full-text available via subscription   (Followers: 6)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Journal Cover Catalysis Letters
  [SJR: 0.777]   [H-I: 94]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-879X - ISSN (Online) 1011-372X
   Published by Springer-Verlag Homepage  [2355 journals]
  • Comparing the Reaction Rates of Plasmonic (Gold) and Non-Plasmonic
           (Palladium) Metal Particles in Photocatalytic Hydrogen Production
    • Authors: M. A. Khan; M. Al-Oufi; A. Toseef; M. A. Nadeem; H. Idriss
      Pages: 1 - 10
      Abstract: Both Pd and Au metal particles are used in photocatalytic hydrogen generation. Yet while both act as electron sink only gold is poised to respond to visible light due to its plasmonic response. In order to quantitatively gauge their relative contribution into the reaction, the photocatalytic H2 production, from Au/TiO2 and Pd/TiO2 catalysts was studied under UV and UV–Vis light. While under UV light excitation, a weak dependence on the work function of the metal is observed, under UV–Vis light, Au is found to be twice more active than Pd. Under identical UV–Vis light irradiation, the turn over frequency calculated from XPS at.% is found to be 2.8 and 1.8 s−1 for Au and Pd, respectively. The effect is far more pronounced when the rates are normalized to the number of particles of each metal. Both the semiconductor TiO2 (UV light) and the plasmonic metal (visible light) need to be excited for the enhancement to occur; visible light alone causes a negligible reaction rate. Photocurrent measurements further confirmed the difference in the photocatalytic activity under UV and UV–Vis light excitation. Moreover, because of the presence of Au particles responding to visible light the reaction rate is enhanced due to “light penetration depth” effect. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2197-z
      Issue No: Vol. 148, No. 1 (2018)
       
  • Photochemical Preparation of Anatase Titania Supported Gold Catalyst for
           Ethanol Synthesis from CO 2 Hydrogenation
    • Authors: Dong Wang; Qingyuan Bi; Guoheng Yin; Peng Wang; Fuqiang Huang; Xiaoming Xie; Mianheng Jiang
      Pages: 11 - 22
      Abstract: Hydrogenation of the greenhouse gas CO2 to higher alcohols through catalysis holds great promise for resource transformation in low-carbon energy supply system, but the efficient and selective synthesis of value-added ethanol by a robust heterogeneous catalyst under relatively mild conditions remains a major challenge. Based on our previous work on Au/TiO2 as an active and selective catalyst for ethanol synthesis, we report here that a facile photochemical route can be used for the preparation of anatase TiO2 supported gold catalyst (Au/a-TiO2) for efficient hydrogenation of CO2. Compared with the conventional deposition-precipitation method requiring strong brønsted base and flammable H2 gas in the complicated and time-consuming process, the photochemical way for the facile preparation of supported gold catalyst shows the advantages of green and energy-saving. Of significant importance is that an impressive space-time-yield of 869.3 mmol gAu −1 h−1, high selectivity, and excellent stability can be readily attained at 200 °C and total pressure of 6 MPa. The effects of irradiation time, solvent, and metal loading or Au particle size on ethanol synthesis are systematically investigated. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2192-4
      Issue No: Vol. 148, No. 1 (2018)
       
  • Vinyl Acetate Formation on Au/Pd(100) Alloy Surfaces
    • Authors: Theodore Thuening; Wilfred T. Tysoe
      Pages: 79 - 89
      Abstract: The reaction between ethylene and acetate species on oxygen-covered Au/Pd(100) alloy surfaces is explored using reflection–absorption infrared spectroscopy and temperature-programmed desorption (TPD). Distinctly different behavior is found for alloys with less than ~ 0.5 monolayers (ML) of gold, where the alloy contains Pd‒Pd bridge sites, and alloys with gold coverages above ~ 0.5 ML, where only isolated Pd sites are available. Ethylene reacts with η2 acetate species on alloys with low gold coverages where it is found that acetate removal rate increases linearly with gold coverage with a concomitant decrease in carbon monoxide formation, indicating that the selectivity also increases. A different acetate species forms on the isolated palladium sites present on the alloy with high gold coverages, which exhibits infrared peaks at ~ 1450 and 1590 cm−1, as opposed to the characteristic frequency of ~ 1414 cm−1 found for the η2 acetate. It is confirmed that the infrared features are due to adsorbed acetate species by using TPD, but this form of adsorbed acetate is found to be completely unreactive with ethylene, even in a relatively high background pressure of ~ 2 Torr, compared with the η2 acetate species that react rapidly in the presence of ethylene pressures of ~ 10−4 Torr. The structure is assigned to a unidentate acetate species with a strong Pd‒O bond, in which the C=O group can interact with an adjacent gold atom and such a structure would rationalize the lack of reactivity with ethylene because ethylene insertion into the Pd‒O bond of this species would be prohibited. This result is surprising because previous catalytic measurements on model gold–palladium alloys under realistic conditions have shown that high-gold coverage Au/Pd(100) alloys are the most active. A possible explanation for this discrepancy is that the alloys become enriched by palladium under reaction conditions until the gold coverage is reduced below ~ 0.5 ML to yield a very catalytically active surface. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2210-6
      Issue No: Vol. 148, No. 1 (2018)
       
  • Role of Support Oxygen Vacancies in the Gas Phase Hydrogenation of
           Furfural over Gold
    • Authors: Maoshuai Li; Laura Collado; Fernando Cárdenas-Lizana; Mark A. Keane
      Pages: 90 - 96
      Abstract: We have examined the role of support oxygen vacancies in the gas phase hydrogenation of furfural over Au/TiO2 and Au/CeO2 prepared by deposition–precipitation. Both catalysts exhibited a similar Au particle size distribution (1–6 nm) and mean (2.8–3.2 nm). Excess H2 consumption during TPR is indicative of partial support reduction, which was confirmed by O2 titration. Gold on CeO2 with a higher redox potential exhibited a greater oxygen vacancy density. A lower furfural turnover frequency (TOF) was recorded over Au/CeO2 than Au/TiO2 and is linked to suppressed H2 chemisorption capacity and strong –C=O interaction at oxygen vacancies that inhibited activity. Gold on non-reducible Al2O3 as benchmark exhibited greater H2 uptake and delivered the highest furfural TOF. Full selectivity to the target furfuryl alcohol was achieved over Au/TiO2 and Au/Al2O3 at 413 K and over Au/CeO2 at 473 K with hydrogenolysis to 2-methylfuran at higher reaction temperature (523 K). A surface reaction mechanism is proposed to account for the activity/selectivity response. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2228-9
      Issue No: Vol. 148, No. 1 (2018)
       
  • Surface Active Ionic Liquids as Catalyst for CO 2 Conversion to Propylene
           Carbonate
    • Authors: Michele O. Vieira; Wesley F. Monteiro; Bruna S. Neto; Rosane Ligabue; Vitaly V. Chaban; Sandra Einloft
      Pages: 108 - 118
      Abstract: CO2 capture is an efficient possibility to mitigate environmental impacts. An efficient transformation of CO2 into useful chemicals is a need from environmental protection and resource utilization viewpoint. Cyclic carbonates, such as propylene carbonate is used in numerous technologies. We hereby report eight surface active ionic liquids (SAILs) composed of the well-known cations ([bmim+] and [TBA+]) and long-alkyl-chain anions ([C12SO4 −], [C12ESO4 −], [C12BSO3 −] and [C12SAR−]). In this work, we have studied catalytic activities of SAILs for cyclic carbonate synthesis. The work demonstrates that [TBA+] is more active as a catalyst because the higher molecular volume increases the distance cation/anion, consequently, a weaker electrostatic interaction cation/anion results in a more nucleophilic anion. The [TBA][C12SO4] was the SAIL that presented better catalytic activity, reaching 79.2% of conversion and 87.7% of selectivity, besides the high capacity of recycles and possible use for the catalysis of other cyclic carbonates. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2212-4
      Issue No: Vol. 148, No. 1 (2018)
       
  • Spirulina (Arthrospira) platensis Supported Ionic Liquid as a Catalyst for
           the Synthesis of 3-Aryl-2-oxazolidinones from Carbon Dioxide, Epoxide,
           Anilines
    • Authors: Seyed Mohsen Sadeghzadeh; Rahele Zhiani; Shokufe Emrani
      Pages: 119 - 124
      Abstract: This study investigates the potential application of the (Ammonio)butane-1-sulfonate modified Spirulina (Arthrospira) platensis biomasses in the synthesis of 3-aryl-2-oxazolidinones from CO2, ethylene oxide, and anilines. High catalytic activity and ease of recovery from the reaction mixture using filtration and several reuse times without significant losses in performance are additional eco-friendly attributes of this catalytic system. The effects of the structure of ionic liquid on the catalytic performance were investigated and the various reaction conditions were optimized. This observation was exploited in the direct and selective chemical fixation of CO2, affording high degrees of CO2 capture and conversion. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2217-z
      Issue No: Vol. 148, No. 1 (2018)
       
  • Kinetics Study of the Transesterification Reaction of Methyl Acetate with
           Isooctyl Alcohol Catalyzed by Dicationic Heteropolyanion-Based Ionic
           Liquids
    • Authors: Yong Liu; Weihua Liu; Xiaonan Shao; Jianhong Wang; Xiying Li; Haiyan Zhang
      Pages: 144 - 153
      Abstract: In this work, dicationic acidic heteropolyanion-based ionic liquids were synthesized, and used in transesterification reaction of methyl acetate with isooctyl alcohol for producing isooctyl acetate. Compared with H2SO4, and H3PW12O40, [Bis-BsImB][HPW12O40] and [Bis-Bs-DABCO][HPW12O40] shown excellent catalytic performance. The reaction kinetics and chemical equilibrium of the transesterification catalyzed by [Bis-BsImB][HPW12O40] and [Bis-Bs-DABCO][HPW12O40] were investigated. The effects of reaction temperature, initial reactant molar ratio, and catalyst concentration on the kinetics were studied in detail. The kinetic data were successfully correlated by a pseudohomogeneous model in the temperature range of 328.15 − 343.15 K. The simulation values obtained by the kinetic model were in good agreement with the experimental data. Moreover, [Bis-BsImB][HPW12O40] and [Bis-Bs-DABCO][HPW12O40] could be easily recovered and reused five times without any obvious decrease in catalytic activity. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2250-y
      Issue No: Vol. 148, No. 1 (2018)
       
  • Tuning Pd-nanoparticle@MIL-101(Cr) Catalysts for Tandem Reductive
           Amination
    • Authors: Amanda E. Anderson; Christopher J. Baddeley; Paul A. Wright
      Pages: 154 - 163
      Abstract: The versatility of MOFs as highly porous Lewis acidic supports for precious metal nanoparticles has been exploited for one-pot tandem reductive amination catalysis. MIL-101(Cr) loaded with Pd nanoparticles ca. 3 nm in size at 0.2–1 wt% has been used to catalyse the reaction of 4′-fluoroacetophenone with benzylamine under 10 bar of H2 to give the secondary amine, 4′-fluoro-α-methyl-N-phenylmethylbenzenemethanamine. For the highest Pd loading, major hydrogenolysis of the secondary amine occurs in a second tandem reaction, but by changing the ratio of Pd to Lewis acidic Cr3+ active sites it is possible to tune the catalytic selectivity to the desired 2° amine product. An empirical kinetic analysis was performed to demonstrate this active site complementarity. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2208-0
      Issue No: Vol. 148, No. 1 (2018)
       
  • Palladium Nanoparticles Covered on Amine-Functionalized Mesoporous Hollow
           SiO 2 Spheres for the Reduction of 4-Nitrophenol
    • Authors: Xiang Liu; Xiaohua Zhao; Lei Zhu; Ningning Liu; Tian Tian
      Pages: 173 - 180
      Abstract: Highly dispersed Pd nanoparticles (NPs) covered on amine-functionalized mesoporous hollow SiO2 spheres (Pd/MHSS-NH2) have been successfully prepared. The morphology, structure and composition of Pd/MHSS-NH2 were characterized by Transmission electron micrograph (TEM), N2 ad-desorption, X-ray diffraction (XRD), Fourier-transfer infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The as-prepared Pd/MHSS-NH2 exhibited remarkably high activity for the reduction of 4-nitrophenol (4-NP) compared with other catalysts, which could be attributed to high dispersion of Pd NPs, amine functional groups on MHSS support, as well as mesoporous MHSS-NH2 shell. Additional, the Pd/MHSS-NH2 catalyst could be recovered by centrifugation from the reaction mixture and recycled six times without loss in activity. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2222-2
      Issue No: Vol. 148, No. 1 (2018)
       
  • Polymer-Supported Cu–Nanoparticle as an Efficient and Recyclable
           Catalyst for Oxidative Homocoupling of Terminal Alkynes
    • Authors: Sk Tarik Aziz; Rafique Ul Islam
      Pages: 205 - 213
      Abstract: Copper nanoparticle on polyaniline support was synthesised by using in situ polymerisation and composite formation technique. This metal polymer nanocomposites material is found to be efficient for homocoupling of terminal alkynes which afford symmetrical 1,4-disubstituted 1,3-diynes in excellent yields under a mild reaction condition using piperidine as a base and dichloromethane at room temperature within 1–8 h. The reusability of the catalyst was also investigated and found to yield excellent yields upto six cycles without losing significant activity. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2237-8
      Issue No: Vol. 148, No. 1 (2018)
       
  • Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity
           Porosity, Redox Properties and Catalytic Activity
    • Authors: Arantxa Davó-Quiñonero; Jorge González-Mira; Dolores Lozano-Castelló; Agustín Bueno-López
      Pages: 258 - 266
      Abstract: A Ce0.9Pr0.1O2 catalyst has been prepared using nitrates as metal precursors, which have been infiltrated into a polymethylmethacrylate colloidal crystal template and calcined at 500 °C. Its catalytic activity for CO oxidation (4.3 μmolCO s−1 gcatalyst −1 at 300 °C) is far superior compared to a reference catalyst prepared in the same way but without the template (1.4 μmolCO s−1 gcatalyst −1 at 300 °C), and even superior to a three dimensionally ordered macroporous (3DOM) catalyst prepared forming metal citrates to obtain the macroporous structure into the template (0.7 μmolCO s−1 gcatalyst −1 at 300 °C). It is demonstrated that infiltration of nitrates into the colloidal crystal template is more positive for catalytic oxidation of CO than formation of the 3DOM structure using citrates, despite the collapse of the macroporous structure. The 3DOM catalyst prepared with citrates has lower surface area (51 m2 g−1) than catalysts prepared using nitrates (118 and 87 m2 g−1 for the infiltrated and non infiltrated catalysts, respectively). The infiltrated catalyst prepared with nitrates reaches the highest surface area, and also develops more micro and mesoporosity and presents smaller crystallite size (8 vs. 16 nm) than the counterpart non infiltrated catalyst. In addition, the population of oxygen vacancies is also much higher in the infiltrated catalyst prepared with nitrates, and it is postulated that this improves oxygen mobility into the mixed oxide lattice and favors the catalyst reduction. On the contrary, it has been ruled out any effect of the infiltration step in the insertion of Pr cations into the ceria lattice. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2215-1
      Issue No: Vol. 148, No. 1 (2018)
       
  • Ir-Catalysed Nitrous oxide (N 2 O) Decomposition: Effect of Ir Particle
           Size and Metal–Support Interactions
    • Authors: I. V. Yentekakis; G. Goula; S. Kampouri; I. Betsi-Argyropoulou; P. Panagiotopoulou; M. J. Taylor; G. Kyriakou; R. M. Lambert
      Pages: 341 - 347
      Abstract: The effect of the morphology of Ir particles supported on γ-Al2O3, 8 mol%Y2O3-stabilized ZrO2 (YSZ), 10 mol%Gd2O3-doped CeO2 (GDC) and 80 wt%Al2O3–10 wt%CeO2–10 wt%ZrO2 (ACZ) on their stability on oxidative conditions, the associated metal–support interactions and activity for catalytic decomposition of N2O has been studied. Supports with intermediate or high oxygen ion lability (GDC and ACZ) effectively stabilized Ir nanoparticles against sintering, in striking contrast to supports offering negligible or low oxygen ion lability (γ-Al2O3 and YSZ). Turnover frequency studies using size-controlled Ir particles showed strong structure sensitivity, de-N2O catalysis being favoured on large catalyst particles. Although metallic Ir showed some de-N2O activity, IrO2 was more active, possibly present as a superficial overlayer on the iridium particles under reaction conditions. Support-induced turnover rate modifications, resulted from an effective double layer [Oδ−–δ+](Ir) on the surface of iridium nanoparticles, via O2− backspillover from the support, were significant in the case of GDC and ACZ. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2233-z
      Issue No: Vol. 148, No. 1 (2018)
       
  • Nonaqueous Biphasic Hydroformylation of Long Chain Alkenes Catalyzed by
           Water Soluble Phosphine Rhodium Catalyst with Polyethylene Glycol Instead
           of Water
    • Authors: Yuanjiang Zhao; Yanli Liu; Jianzhang Wei; Haiyan Fu; Xueli Zheng; Maolin Yuan; Ruixiang Li; Hua Chen
      Pages: 438 - 442
      Abstract: The application of polyethylene glycol (donated as PEG), as an environmentally benign solvent instead of water, in rhodium catalyzed hydroformylation of long chain alkenes by using water soluble phosphine BISBIS or TPPTS (TPPTS: sodium salt of sulfonated triphenylphosphine, BISBIS: sodium salt of sulfonated 2,2′-bis(diphenylphosphinomethyl)-1,1′-biphenyl) is herein reported. The conversion of long chain alkenes in PEG-200 could reach above 95.0% after a short reaction time (15 min). In addition, an efficient phase separation and recycling of PEG-200 and catalyst were achieved. The leaching of rhodium into product phase detected by ICP-AES was less than 0.06 wt% of the initial amount. Graphical
      PubDate: 2018-01-01
      DOI: 10.1007/s10562-017-2247-6
      Issue No: Vol. 148, No. 1 (2018)
       
  • Pd–4,6-Diamino-2-pyrimidinethiol Complex Supported on SBA-15 as a Useful
           and Retrievable Catalyst for Suzuki–Miyaura and Stille C–C Coupling
           Reactions
    • Authors: Kosar Nouri; Maryam Hajjami; Gouhar Azadi
      Abstract: In this paper, Pd–4,6-diamino-2-pyrimidinethiol complex supported on SBA-15 as a novel heterogeneous catalyst with high activity for the reaction of aryl halides with phenylboronic acid or triphenyltin chloride have been well explored. The prepared catalyst has been characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, N2 adsorption/desorption isotherms (BET), transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis and inductively coupled plasma analysis. The synthesized nanocatalyst could be easily recovered from the reaction mixture and reused five times without any loss in activity. Graphical
      PubDate: 2018-01-08
      DOI: 10.1007/s10562-017-2290-3
       
  • Direct Conversion of Syngas to Ethanol over Rh–Fe/γ-Al 2 O 3 Catalyst:
           Promotion Effect of Li
    • Authors: Yan Chen; Haitao Zhang; Hongfang Ma; Weixin Qian; Fangyu Jin; Weiyong Ying
      Abstract: The influence of Li loading on the activity and selectivity of Rh–Fe/γ-Al2O3 catalysts for the synthesis of ethanol from syngas was explored. The catalysts were characterized by means of XRD, N2 adsorption, TPR, XPS, CO-TPD, and DRIFTS. Introduction of Li into Rh–Fe catalyst inhibited the Rh reducibility, which could stabilize oxidized Rh species. This led to the significant increase of Rh+/Rh0 ratio over reduced catalysts, and then Rh+ became the major Rh species on the surface of reduced Li promoted catalyst. The enhanced Rh+ content improved the generation and stabilization of gem-dicarbonyls Rh+(CO)2 species on Rh+ sites, which was indicated by CO adsorption behavior. It can be concluded that the addition of Li facilitated CO insertion ability and simultaneously suppressed CO dissociation ability. Lower hydrocarbons selectivity and higher ethanol selectivity were observed on Li modified Rh–Fe catalysts. The catalyst with 0.5 wt% Li exhibited the highest selectivity being 30.2% to ethanol. Graphical
      PubDate: 2018-01-08
      DOI: 10.1007/s10562-017-2202-6
       
  • Sulphonic Acid-Functionalized Benzimidazolium Based Poly Ionic Liquid
           Catalyzed Esterification of Levulinic Acid
    • Authors: Avinash Ganesh Khiratkar; Kamlesh Rudreshwar Balinge; Manikandan Krishnamurthy; K. K. Cheralathan; Dipesh S. Patle; Vishal Singh; Sanyam Arora; Pundlik Rambhau Bhagat
      Abstract: Esters of levulinic acid (LA) are bio-based compounds having widespread applications and have the remarkable potential to be blended with commercial diesel or gasoline. In this study, a sulphonic acid-functionalized benzimidazolium based poly ionic liquid (SAFBPIL) catalyst was prepared and characterized by NMR, FT-IR, elemental analysis (C, H, N, S), TGA and BET surface area. Brønsted acidity was determined by anion-exchange/neutralization titration method and was found to be 5.55 mmol/g. The heterogeneous ionic liquid catalyst showed an excellent thermal stability up to 270 °C. Experiments were carried at different temperatures, LA to ethanol molar ratios, catalyst loadings and duration of the reaction in a batch reactor. The highest conversion was obtained at 70 °C using an initial LA:ethanol molar ratio of 1:10 and a catalyst loading of 15 wt% in 9 h. It was observed that ethyl levulinate (EL) could be effectively obtained over SAFBPIL with a selectivity higher than 99.5%. This is due to more acidic sites exhibited on SAFBPIL catalyst under optimized conditions. Herein, we are reporting for the first time an esterification of LA to EL using a new SAFBPIL as a catalyst. The catalyst was recycled for five runs without significant loss of catalytic activity. Graphical
      PubDate: 2018-01-04
      DOI: 10.1007/s10562-017-2284-1
       
  • Pt/Ferric Hydroxyphosphate: An Effective Catalyst for the Selective
           Hydrogenation of α,β-Unsaturated Aldehydes (Ketones) into
           α,β-Unsaturated Alcohols
    • Authors: Cheng Liu; Wei Luo; Junhua Liu; Lei Sun; Yue Yang; Gui Liu; Fang Wang; Wei Zhong; Curtis Guild; Steven L. Suib
      Abstract: Four micro (nano)-sized mesoporous ferric hydroxyphosphates (FHP) are synthesized by a reverse microemulsion-solvothermal method, and then are used as supports to prepare supported Pt catalysts. The mean particle diameter of Pt nanoparticles (NPs) was 4.5–4.6 nm. When the four different Pt/FHP catalysts were used into the hydrogenation of α,β-unsaturated aldehydes (ketones) to their corresponding unsaturated alcohols, Pt/FHP (c) catalyst showed better catalytic performance than the other three partners. Under the optimal experimental conditions, several tested α,β-unsaturated aldehydes could be effectively transformed into corresponding unsaturated alcohols over Pt/FHP (c) catalyst. The catalyst could be recycled and reused several times without activity loss. We propose the stronger interaction between the Pt NPs and ferric ions of the FHP (c) are responsible for its good catalytic performance, and this stronger interaction should be rooted in its enhanced Lewis acid strength. Graphical
      PubDate: 2018-01-04
      DOI: 10.1007/s10562-017-2280-5
       
  • Heteropoly Acid Supported on Cu-Doped Three-Dimensionally Ordered
           Macroporous SiO 2 as Efficient Catalyst for the Selective Oxidation of
           Methacrolein
    • Authors: Xinxin Ma; Tingting Wang; Minna Zhang; Wancheng Zhu; Zhaoshun Zhang; Heng Zhang
      Abstract: Cu-doped three-dimensionally ordered macroporous (3DOM) SiO2 was prepared by a colloidal templating method and used as the support of heteropoly acid for the selective oxidation of methacrolein (MAL) to methacrylic acid (MAA). The doping effects of Cu on the structures, physico-chemical properties and catalytic performances of the catalysts were investigated. Results showed that Cu was well distributed in the SiO2 framework with the mole ratio of Cu/Si = 5%, and the specific surface area was much higher than that of the pure 3DOM SiO2. After supported with H4PMo11VO40 (HPVA), the specific surface areas of the as-synthesized catalysts significantly decreased, from 239 to 64 m2 g−1 for HPVA/3DOM (5%Cu)–SiO2 and from 141 to 32 m2 g−1 for HPVA/3DOM SiO2, respectively, because of the blockage of the micropores. The supported HPVA retained Keggin-type primary structure and its reducibility was obviously improved due to the existence of Cu in the supports, which thereby resulted in the great enhancement of the catalytic property. The conversion of MAL and the selectivity to MAA were respectively 36 and 47% on HPVA/3DOM SiO2. Comparatively, the conversion of MAL reached 63% with 82% MAA selectivity on HPVA/3DOM (5%Cu)–SiO2. Graphical
      PubDate: 2018-01-04
      DOI: 10.1007/s10562-017-2288-x
       
  • Selective Synthesis of Secondary Arylcarbamates via Efficient and Cost
           Effective Copper-Catalyzed Mono Arylation of Primary Carbamates with Aryl
           Halides and Arylboronic Acids
    • Authors: Ali Reza Sardarian; Iman DindarlooInaloo; Milad Zangiabadi
      Abstract: An efficient, selective and cost-effective procedure has been developed for mono N-arylation of primary alkyl and benzyl carbamates with aryl iodides and bromides by incorporating CuI as an inexpensive and commercially available catalyst. Despite previous reports on C–N coupling reactions, this process does not need expensive ligands and takes advantage of readily available and inexpensive ethylenediamine (EDA) as the ligand. Reaction times were relatively short and related N-arylated carbamates were obtained in excellent yields. Interestingly, replacing CuI with Cu(OAc)2 allowed us to use arylboronic acids as coupling partner for this reaction. All products are well characterized by 1H- and 13C-NMR, MS, melting point, IR and CHNS techniques. Graphical
      PubDate: 2018-01-04
      DOI: 10.1007/s10562-017-2277-0
       
  • Photocatalytic Ozonation of 2,4-Dichlorophenoxyacetic Acid using LaFeO 3
           Photocatalyst Under Visible Light Irradiation
    • Authors: Jinlin Li; Weisheng Guan; Xu Yan; Ziyang Wu; Weidong Shi
      Abstract: In this paper, LaFeO3 nanoparticles were used as a visible light photocatalyst for efficient removal of 2,4-dichlorophenoxyacetic acid (2,4-D) with the assist of ozone. The pseudo-first-order kinetic rate constants of degrading 2,4-D removal in 60-PO/Vis in 1 h was 5.72 times as great as the sum of that when using LFO/O2/Vis and 60-Oz/Vis at the best concentration of ozone (60 mL/min). This improvement was attributed to the efficient synergistic effect between photocatalysis and ozonation triggered by LaFeO3. In PO/Vis, ozone facilitates the photo-generated electrons trapping and improves separation efficiency of photo-generated charges, which enhanced the yield of hydroxyl radical, so as to the degradation efficiency of organic pollutants. In addition, the effects of ozone concentrations on the photocatalytic ozonation processes were also studied. Moreover, we demonstrated the high stability and reusability of LaFeO3 photocatalyst in photocatalytic ozonation process by circle experiment. Graphical Schematic illustration of the reaction mechanism of enhanced photocatalytic ozonation of 2,4-D by LaFeO3 under visible light.
      PubDate: 2017-12-04
      DOI: 10.1007/s10562-017-2206-2
       
 
 
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