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  Subjects -> ENGINEERING (Total: 2358 journals)
    - CHEMICAL ENGINEERING (201 journals)
    - CIVIL ENGINEERING (192 journals)
    - ELECTRICAL ENGINEERING (107 journals)
    - ENGINEERING (1240 journals)
    - ENGINEERING MECHANICS AND MATERIALS (394 journals)
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ENGINEERING (1240 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: 20)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
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: 265)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
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 Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
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: 6)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
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: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
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: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 43)
Advances in Science and Research (ASR)     Open Access   (Followers: 4)
Aerobiologia     Hybrid Journal   (Followers: 2)
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: 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)
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: 5)
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: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 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: 26)
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: 2)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
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: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
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: 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  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
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  
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: 2)
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: 20)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
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: 2)
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: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 272)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 209)
Composites Part B : Engineering     Hybrid Journal   (Followers: 246)
Composites Science and Technology     Hybrid Journal   (Followers: 183)
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: 30)
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: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
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)

        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  [2352 journals]
  • Regioselective Biocatalytic Hydroxylation of Fatty Acids by Cytochrome
           P450s
    • Authors: Lucas Hammerer; Christoph K. Winkler; Wolfgang Kroutil
      Pages: 787 - 812
      Abstract: Cytochrome P450 enzymes catalyze a broad set of C–H activation reactions, the most prominent being hydroxylation. This review provides an overview of the regioselectivity (CH3-terminal, in-chain, and carboxylate-terminal) and the optical purity of the hydroxylation products obtained from fatty acids as far as described, focusing on systems close to preparative application. Graphical
      PubDate: 2018-03-01
      DOI: 10.1007/s10562-017-2273-4
      Issue No: Vol. 148, No. 3 (2018)
       
  • Introduction of Two Halo-Alkali-thermo-stable Biocatalysts: Purification
           and Characterization
    • Authors: Leila Satari Faghihi; Bagher Seyedalipour; Gholamhossein Riazi; Salman Ahmady-Asbchin
      Pages: 831 - 842
      Abstract: Halophilic bacterium, producing two extracellular proteases, was isolated from Badab-Sourt, Iran. 16S rDNA analysis shown high similarity with the genera Idiomarina. Maximum secretion of enzymes was observed during the early-stationary phase of bacterial growth. Both extracellular proteases were purified by three purification steps; ammonium sulfate precipitation, Q-Sepharose, and Sephadex G-200 chromatography columns. The molecular weight of purified enzymes was determined by SDS-PAGE gel electrophoresis with approximate masses of 48 and 51 kDa (45.57 and 80.30 U/mg specific activity). Proteases synthesized by strain S-18 were affected by medium compositions. Optimum concentration of substrate, pH, and temperature for both enzymes activity were 0.5% casein, 9.0, and 50 °C. However, purified proteases showed different activity at various salt concentrations, which their maximum activity was determined in the presence of 7.5 and 5% NaCl. The activity of enzymes increased in the presence of metal ions such as Mn2+ and Cu2+ and decreased by the presence of Hg2+ and Fe2+. Both proteases were strongly inhibited by SDS, while DDT, EDTA, and 2-Mercaptoethanol could stimulate their activity. The results of present research might be interesting issue for industrial applications and biotechnological processes. Graphical
      PubDate: 2018-03-01
      DOI: 10.1007/s10562-018-2295-6
      Issue No: Vol. 148, No. 3 (2018)
       
  • Layered Double Hydroxide Derived Mg 2 Al-LDO Supported and K-Modified Ru
           Catalyst for Hydrogen Production via Ammonia Decomposition
    • Authors: Q. Su; L. L. Gu; A. H. Zhong; Y. Yao; W. J. Ji; W. P. Ding; C. T. Au
      Pages: 894 - 903
      Abstract: Mg–Al mixed oxide is derived via the precursor of Mg2Al-layered double hydroxide (Mg2Al-LDH), and employed to load Ru and KNO3 to develop the K–Ru/Mg2Al-LDO catalyst for hydrogen production through ammonia decomposition. Single MgO and Al2O3 were used to prepare reference catalysts K–Ru/MgO and K–Ru/Al2O3 for comparison. A mechanically mixed K–Ru/MgO and K–Ru/Al2O3 sample was also made to explore the interaction of oxide constituents. K–Ru/Mg2Al-LDO generally outperforms K–Ru/MgO and K–Ru/Al2O3 as well as the Ru-based catalysts supported on other transition metal oxides. The comparison study demonstrated significant impact of structural homogeneity and strong interaction of the oxide constituents on activity. The unique structural feature of Mg2Al-LDO gives rise to the enhanced surface basicity, low-temperature feasible N2 desorption, and remarkable hydrogen spillover effect. All these aspects are favorable on K–Ru/Mg2Al-LDO for electronic modification of Ru sites, rate-determining steps in both low and high reaction temperature, and quick recycle of active sites, accounting for its superior activity plus good durability. Graphical
      PubDate: 2018-03-01
      DOI: 10.1007/s10562-017-2195-1
      Issue No: Vol. 148, No. 3 (2018)
       
  • Synthesis of Magnetic Mn 2 O 3 /CuFe 2 O 4 Catalysts for the Aerobic
           Oxidation Synthesis of p -Hydroxybenzaldehyde
    • Authors: Mong Mo Huynh; Dinh Phuong Do; Tuan Ngoc Tran; Huu Khanh Hung Nguyen; Hon Quoc Tran; Thi Xuan Thi Luu; Tien Khoa Le
      Pages: 924 - 932
      Abstract: Magnetic Mn2O3/CuFe2O4 catalysts for the synthesis of p-hydroxybenzaldehyde were prepared by a facile in-situ growth method at different annealing temperatures in order to study the influences of annealing temperatures on their structure, atomic composition, morphology, surface functional groups, magnetic and catalytic properties. The catalytic performance was evaluated via the aerobic oxidation of p-hydroxybenzyl alcohol to p-hydroxybenzaldehyde. All Mn2O3/CuFe2O4 catalysts exhibited the activity for the synthesis of p-hydroxybenzaldehyde with the selectivity of 100% and ferromagnetic properties, which allows them to be easily separated from the solution by a magnet. When the annealing temperature increased from 300 to 500 °C, the atomic manganese content on the surface and the particle size were not modified, but highly crystalline α-Mn2O3 was formed on the surface of CuFe2O4 nanoparticles, leading to the enhanced conversion of p-hydroxybenzyl alcohol. It was also observed that the elemental composition and the core–shell structure of this catalyst remained unchanged after the synthesis of p-hydroxybenzaldehyde, which ensures its magnetic separation. However, when the annealing temperature rose up to 700 °C, the catalytic activity was reduced, due to the increase of Mn–O bonding strength and the growth of particles. Graphical
      PubDate: 2018-03-01
      DOI: 10.1007/s10562-017-2293-0
      Issue No: Vol. 148, No. 3 (2018)
       
  • Using Pd as a Cocatalyst on GaN–ZnO Solid Solution for
           Visible-Light-Driven Overall Water Splitting
    • Authors: Zheng Li; Fuxiang Zhang; Jingfeng Han; Jian Zhu; Mingrun Li; Bingqing Zhang; Wenjun Fan; Junling Lu; Can Li
      Pages: 933 - 939
      Abstract: Rhodium was reported to be an essential component of the efficient cocatalyst (Rh2−xCrxO3 or core/shell of Rh@Cr2O3) on GaN–ZnO for photocatalytic overall water splitting (POWS). Herein we demonstrate that the Rh can be replaced by less-expensive Pd deposited via atomic layer deposition and together with photodeposition of Cr2O3 shell, a comparable activity in POWS can be achieved even with much less Pd loading than Rh in Rh2−xCrxO3/GaN–ZnO under the same reaction conditions. Graphical
      PubDate: 2018-03-01
      DOI: 10.1007/s10562-018-2294-7
      Issue No: Vol. 148, No. 3 (2018)
       
  • Hierarchically Pore Structure poly 2-(Dimethyl amino) ethyl
           methacrylate/Hi-ZSM-5: A Novel Acid–Base Bi-functional Catalyst as
           Heterogeneous Platform for a Tandem Reaction
    • Authors: Roozbeh Javad Kalbasi; Anahita Khojastegi
      Abstract: A simple method is developed to prepare an efficient and low cost acid–base bifunctional catalyst by using poly 2-(dimethyl amino) ethyl methacrylate as a basic part and hierarchical ZSM-5 as an acidic part of the catalyst. Tandem reaction of deacetalization–Knoevenagel condensation was selected to evaluate the prepared catalyst and the outcomes were excellent. Graphical
      PubDate: 2018-02-06
      DOI: 10.1007/s10562-018-2301-z
       
  • Dinuclear Silver Complexes for Solvent-Free Catalytic Synthesis of Cyclic
           Carbonates from Epoxides and CO 2 at Ambient Temperature and Pressure
    • Authors: Jing-Jing Chen; Zhi-Liang Gan; Xiao-Yi Yi
      Abstract: A well structure-defined dinuclear silver complex [Ag2(PDP)]OTf, where HPDP—bispyridylpyrrole ligand, OTf−—triflato, was used as catalyst for coupling of CO2 with epoxides to generate exclusive cyclic carbonates. Yield up to 87% was obtained for various substrates at a low loading of 0.1 mol%, at ambient temperature and pressure under solvent-free condition. The catalytic reusability of 1·OTf was also studied. Graphical Although coupling reaction of CO2 with epoxides can be catalyzed by dinuclear silver complexes with low catalyst loading at ambient temperature and pressure, the experiment of reusability of catalyst displays the dinuclear silver complex is decomposed due to the excess Br− in co-catalyst TBAB. The formed silver triphenylphosphine complex or inorganic silver materials provide real catalytic reactivity to the coupling reaction.
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-017-2268-1
       
  • The Effect of La 2 O 3 on Ni/Al 2 O 3 Catalyst for Methanation at Very Low
           CO x /H 2 Ratio
    • Authors: Kamila Michalska; Paweł Kowalik; Wiesław Próchniak; Tadeusz Borowiecki
      Abstract: The effect of La2O3 on physicochemical and catalytic properties of Ni/Al2O3 catalysts for carbon oxides methanation was investigated. A series of model Ni–La–Al catalysts with a similar Ni/(Al + La) ratio and with a variable Ni/La ratio were prepared by coprecipitation method. The textural properties of catalysts, reducibility and reaction rate as well as specific activity and the apparent activation energies of carbon oxides methanation was determined. The results reveal a strong and beneficial influence of La2O3 on catalytic activity, despite the fact that their basic textural-surface properties were not substantially modified. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-018-2302-y
       
  • Surface-Dependence of Adsorption and Its Influence on Heterogeneous
           Photocatalytic Reaction: A Case of Photocatalytic Degradation of Linuron
           on Zinc Oxide
    • Authors: Sutaporn Meephon; Thanyada Rungrotmongkol; Nopporn Kaiyawet; Somchintana Puttamat; Varong Pavarajarn
      Abstract: This work systematically investigates a discrepancy in photocatalytic degradation pathway observed even when same kind of photocatalyst is used. This issue is particularly important for the degradation of toxic compound because the shifting in the pathway may result in intermediates having increased toxicity. Linuron, which is a toxic herbicide, is used as a model compound and zinc oxide (ZnO) is used as a catalyst. Two forms of ZnO having different exposing surfaces, i.e., conventional particles and nanorods are considered. It is experimentally shown and confirmed by molecular simulation that the adsorption and subsequent degradation are surface dependent. The adsorption capacity of linuron on polar surfaces of ZnO is much higher than that on non-polar surface. More importantly, alignments of linuron molecule adsorbing on different surfaces are different, leading to formation of different degradation intermediates. The degradation takes place on both aliphatic and aromatic sides when linuron adsorbs on polar surfaces whereas only the aliphatic part is attacked by hydroxyl radicals on the non-polar mixed terminated surface. The results in this work indicate that the exposing surface of the photocatalyst is the key factor in determining the degradation pathway and it should be considered in the catalyst design. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-018-2300-0
       
  • Direct and Solvent-Free Aminolysis of Triglyceride from Oenocarpus bataua
           (Patawa) Oil Catalyzed by Al 2 O 3
    • Authors: Pedro H. F. Araújo; Pedro H. da S. Barata; Inana F. Araújo; Jhone M. Curti; Raquel R. Amaral; Didier Bereau; José Carlos T. Carvalho; Irlon M. Ferreira
      Abstract: The amidation of fatty acid is an important reaction for synthesis of fatty alkolamines with a variety of pharmacological activities. The objective of this paper was to demonstrate the aminolysis direct and solvent of the triglycerides from the patawa oil by heterogeneous catalysis. The results of the amidation direct free solvents were favorable using 5% Al2O3 as catalyst, with a conversion of 94% at 24 h of reaction. After spectroscopic characterization, we decided explore the antimicrobial tests of the fatty amides (FAA) against the Staphylococcus aureus strain (ATCC 33591), showing a MIC activity of 1.9612 mg/mL and the fatty ethyl esters (FAEE) a 3.4125 mg/mL MIC. Therefore, the synthesis direct free solvents of FAA by Al2O3 from patawa oil was viable and innovative. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-018-2306-7
       
  • NiMgAlCe Catalysts Applied to Reforming of a Model Biogas for Syngas
           Production
    • Authors: Ananda Vallezi Paladino Lino; Elisabete Moreira Assaf; José Mansur Assaf
      Abstract: Hydrotalcite mixed oxide catalysts promoted with CeO2 containing nickel as the active phase were employed in the reforming of a free of contaminants model biogas. Catalysts were characterized using techniques such XRD, H2-TPR, CO2-TPD, Raman spectroscopy and TEM analyses. They showed a good performance along the 6 h of testing. Despite the drastic conditions for catalysts evaluation (low temperature and excess of CH4) that facilitate carbon deposition, the Ni 10 wt% catalyst showed a deposition rate similar to catalyst evaluated in softer conditions already reported in literature. The Ni 5 wt% spent catalyst showed the lowest carbon deposition rate among the three catalysts tested. Together with carbon filaments, the Ni 15 wt% catalyst featured the presence of encapsulating and coating carbon and they both would lead to deactivation, as attested by its oscillating activity behavior. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-018-2304-9
       
  • Precious Metal Doped Ni–Mg/Ceria–Zirconia Catalysts for Methane
           Conversion to Syngas by Low Temperature Bi-reforming
    • Authors: Nada H. Elsayed; Debtanu Maiti; Babu Joseph; John N. Kuhn
      Abstract: Low temperature (450–600 °C) bi-reforming of methane was studied over platinum (0.16 wt%) or palladium (0.13 wt%) along with nickel (1.4 wt%) and magnesium (1.0 wt%) immobilized onto a ceria–zirconia support (termed 0.16Pt and 0.13Pd). Bi-reforming studies using a feed ratio of 3:1:2 for CH4:CO2:H2O, respectively, showed that the H2:CO ratio neared the desired ratio of 2 between 500 and 600 °C for the 0.16Pt catalyst and consistent with bi-reforming at more traditional conditions. This H2:CO ratio was desirable (near 2) compared to dry or steam reforming alone, as well as to other CH4:CO2:H2O ratios. Reaction studies showed that CH4 conversion decreased with increasing GHSV (68,000–272,000 h−1) at 500 °C and increased with increasing temperature at a GHSV of 136,000 h−1 for both catalyst systems. However, the Pt-based catalyst had more consistent H2:CO ratios between 1.9 and 2.2 (T ≥ 500 °C) compared to its Pd counterpart (H2:CO ratios of 1.6–3.0), which was linked to the increased rWGS activity and stronger CO2 adsorption. This study indicates reasonable CH4 conversions and H2:CO ratio near 2 can be achieved despite operating in this low temperature regime and may enable intensified processes for the conversion of methane to value-added products. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-018-2310-y
       
  • New Insights into the Kinetics of Structural Transformation and
           Hydrogenation Activity of Nano-crystalline Molybdenum Carbide
    • Authors: Khaled O. Sebakhy; Gerardo Vitale; Azfar Hassan; Pedro Pereira-Almao
      Abstract: Transformation of cubic molybdenum carbide into hexagonal β-Mo2C was found to follow the Avrami–Erofeev kinetic model with an n parameter of four indicating a slow nucleation step with a polyhedral growth of the transformed phase. The transformation not only occurred at 773 K under atmospheric H2 pressure, but also imperceptibly occurred under the employed hydrogenation reaction conditions (413 K and 70 psig of H2 pressure) when using toluene or 1-octene as reactants, not affecting the activity under the steady state. Our computational studies also revealed that both crystal structures share common atomic cluster arrangements with small differences in angles and interatomic distances. The transformation was triggered by local distortions which favored shorter and more homogeneous interatomic distances as present in the hexagonal phase. The prepared molybdenum carbide materials were selective to the hydrogenation of 1-octene under the mild hydrogenation conditions tested. Hydrogenation of 1-octene was preferential in a 50 wt% mixture of toluene and 1-octene with minimal toluene hydrogenation under the tested conditions. Graphical
      PubDate: 2018-02-02
      DOI: 10.1007/s10562-017-2274-3
       
  • Low-Temperature CO Oxidation: Effect of the Second Metal on Activated
           Carbon Supported Pd Catalysts
    • Authors: Amit Singhania; Shipra Mital Gupta
      Abstract: Activated carbon (AC) supported monometallic Pd and bimetallic Pd-M (M = Co, Ni, and Cu) catalysts were prepared by impregnation-reduction method and investigated for carbon monoxide (CO) oxidation. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed highly disperse Pd-M nanoparticles (~ 3–5 nm) on the AC support. The addition of the second transition metal in Pd/AC resulted in an increase in the specific surface area and smaller average particle size. CO oxidation experiments were carried out in a vertical fixed-bed quartz reactor at gas hourly space velocity (GHSV) of 30,000 h− 1 under atmospheric pressure. The catalytic order is as follows: Pd–Cu/AC > Pd–Ni/AC > Pd–Co/AC > Pd/AC. The T50 (50% CO conversion) value of Pd–Cu/AC and Pd/AC catalysts are 30 and 70 °C. BET, XRD and TEM analysis of the used Pd-M/AC and Pd/AC catalysts were performed in order to find any change in the specific surface area, structure, morphology, and average particle size of the catalysts after CO oxidation. The results showed that the bimetallic Pd-M/AC catalysts had better catalytic activity and stability than the monometallic Pd/AC catalyst. Pd–Cu/AC showed excellent time-on-stream stability of 50 h. The apparent activation energy of the Pd–Cu/AC is found to be 69.32 kJ mol− 1. Thus, bimetallic Pd-M/AC catalysts have a potential for practical CO oxidation reaction. Graphical
      PubDate: 2018-01-23
      DOI: 10.1007/s10562-018-2298-3
       
  • Photocatalytic Behavior of Induced Membrane by ZrO 2 –SnO 2
           Nanocomposite for Pharmaceutical Wastewater Treatment
    • Authors: Seyedeh Fatemeh Zakeritabar; Mohsen Jahanshahi; Majid Peyravi
      Abstract: In this research, the Polysulfone (PS) membrane was blended with ZrO2–SnO2 nanocomposite as a promising tool for pharmaceutical wastewater to evaluate the impression of the synthesized ZrO2–SnO2 nanocomposite membrane on the efficiency and antibiofouling behaviors. The hydrophilicity, pharmaceutical wastewater permeability, photocatalytic activity and anti-fouling behavior of nanocomposite membranes were studied in details. The outcomes demonstrate that the nanocomposite membranes indicated considerable photocatalytic degradation of pharmaceutical wastewater under UV light irradiation during filtration separation, and nanocomposite membrane fouling could be remarkably diminished after UV irradiation, leading to high pharmaceutical wastewater treatment for long-term performance. The flux of the ZrO2–SnO2 nanocomposite membranes after being irradiated by UV light was increased significantly in comparison with an origin PS membrane. The results of PS0.5 membrane show the best flux of 73.78 l/m2 h increase 50.7% compared to the neat membrane. Likewise, the degradation efficiency, COD removal and flux recovery ratio of this modified membrane was also improved to 90, 57.1 and 68.5%, respectively. The hydrophilicity of PS0.5 membrane under UV irradiation was realized with a decline from 62.9° to 45.97°. Our research indicates that ZrO2–SnO2 nanocomposite membranes with photocatalytic attributes under UV light are an impressive method to resolve the pharmaceutical wastewater fouling problem. Graphical
      PubDate: 2018-01-23
      DOI: 10.1007/s10562-018-2303-x
       
  • Effective Catalyst for Oxidation Synthesis of
           2,4,6-Trimethylbenzoyldipenylphosphine Oxide: V/MCM-41
    • Authors: Tingting Wang; Zhiming Wang; Junjing Zhao; Qing Yu; Zhongwei Wang
      Abstract: 2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO) is an important photoinitiator, nevertheless some drawbacks exist in its synthesis. So V/MCM-41 catalysts were designed. Compared with commonly used VO(acac)2, V/MCM-41 catalysts exhibited excellent TPO yield (92.5%), which makes the usage of inorganic vanadium possible and is benefit both in academic and in industry. Graphical
      PubDate: 2018-01-23
      DOI: 10.1007/s10562-018-2299-2
       
  • Interfacial Engineering of NiMo/Mesoporous TiO 2 Catalyst with Carbon for
           Enhanced Hydrodesulfurization Performance
    • Authors: Licheng Li; Hainqin Yue; Shanshan Chen; Liangliang Huang; Xiaobao Li; Zhuhong Yang; Xiaohua Lu
      Abstract: 1 and 5 wt% initial introduced contents of carbon (denoted as 1C/TiO2 and 5C/TiO2, respectively) were used to engineer the interfacial properties of mesoporous TiO2 for studying its hydrodesulfurization (HDS). The physical structure, surface properties and dispersion state of active species of samples were characterized by various technologies. The results showed that there was no obvious difference in physical structure of supports and catalysts before and after interfacial engineering. The carbon species formed on the surface of 1C/TiO2 was only graphitic carbon, whereas that of 5C/TiO2 was composed of mixed graphitic carbon and amorphous carbon. H2S-TPD results displayed that H2S adsorption–desorption behavior was mainly influenced by the different states of carbon species: H2S easily desorbed from 1C/TiO2 surface but strongly adsorbed on 5C/TiO2 surface. This was because H2S had a strong adsorption on amorphous carbon, but a weak one with the graphitic carbon. Sulfided active species were well formed in both 1C/TiO2 and 5C/TiO2 supported catalysts. The dibenzothiophene (DBT) conversion was increased to 98% on the 1C/TiO2 supported catalyst, but was decreased to 50% on the 5C/TiO2 supported catalyst, significantly different from the conversion of the pristine TiO2 supported catalyst (65%). It was found that the H2S adsorption–desorption behavior was closely related to the kind of interfacial carbon, which further influenced the HDS performance of mesoporous TiO2-supported HDS catalyst. Graphical
      PubDate: 2018-01-23
      DOI: 10.1007/s10562-018-2308-5
       
  • Facile Synthesis of Optically-Active γ-Valerolactone from Levulinic Acid
           and Its Esters Using a Heterogeneous Enantio-Selective Catalyst
    • Authors: Tsutomu Osawa; Yuya Tanabe
      Abstract: Optically-active γ-valerolactone was synthesized by the enantio-selective hydrogenations of levulinic acid and its esters. A tartaric acid-NaBr-modified nickel catalyst produced the optically-active γ-valerolactone with a 60% enantiomeric excess (ee), almost quantitative conversion and chemoselectivity. The synthesis of the optically-active γ-valerolactone using the enantio-selective heterogeneous catalyst would be promising for the large-scale industrial production from levulinic acid and its esters, which can be obtained by the acid-catalyzed dehydration of cellulosic fraction of biomass. Graphical
      PubDate: 2018-01-18
      DOI: 10.1007/s10562-017-2291-2
       
  • l -Lysine Functionalized Polyacrylonitrile Fiber: A Green and Efficient
           Catalyst for Knoevenagel Condensation in Water
    • Authors: Pengyu Li; Yuanyuan Liu; Ning Ma; Wenqin Zhang
      Abstract: The l-lysine functionalized polyacrylonitrile fiber (PANLF) was prepared by grafting the l-lysine into a commercially available polyacrylonitrile fiber and showed highly catalytic activity for Knoevenagel condensation reaction. With low temperature (45 °C) and short reaction time (1 h), the fiber catalyst was well applicable to Knoevenagel condensation of a wide range of aldehydes and the yields could reach up to 99%. Interestingly, only in water could the reaction take place smoothly (with a yield of 88%) and a polar micro-environment promoted reaction process had been proposed to explain this phenomenon. Besides, the fiber catalyst has advantages of easy preparation, high functional degree, strong mechanical strength and thermal stability, etc. And it can be reused at least 5 times without further treatment and performed well in scaled-up experiment (amplified 50 times) and flow chemistry experiment (no loss of catalytic activity after 48 h), which indicates its potential application in industry application. Graphical
      PubDate: 2018-01-18
      DOI: 10.1007/s10562-017-2287-y
       
  • Unveiling the Effects of Linker Substitution in Suzuki Coupling with
           Palladium Nanoparticles in Metal–Organic Frameworks
    • Authors: Xinle Li; Biying Zhang; Ryan Van Zeeland; Linlin Tang; Yuchen Pei; Zhiyuan Qi; Tian Wei Goh; Levi M. Stanley; Wenyu Huang
      Abstract: The establishment of structure–property relationships in heterogeneous catalysis is of prime importance but remains a formidable challenge. Metal–organic frameworks (MOFs) featuring excellent chemical tunability are emerging as an auspicious platform for the atomic-level control of heterogeneous catalysis. Herein, we encapsulate palladium nanoparticles (Pd NPs) in a series of isoreticular mixed-linker MOFs, and the obtained MOF-Pd NPs catalysts were used to unveil the electronic and steric effects of linker substitution on the activity of these catalysts in the Suzuki–Miyaura cross-coupling reactions. Significantly, m-6,6′-Me2bpy-MOF-Pd exhibits a remarkable enhancement in the activity compared to non-functionalized m-bpy-MOF-Pd and m-4,4′-Me2bpy-MOF-Pd. This study unambiguously demonstrates that the stereoelectronic properties of linker units are crucial to the catalytic activity of nanoparticles encapsulated in MOFs. More interestingly, the trend of activity change is consistent with our previous work on catalytic sites generated in situ from Pd(II) coordinated in MOFs bearing the same functional groups, which suggests that both MOF-Pd NPs and MOF-Pd(II) catalysts generate similar active centers during Suzuki–Miyaura coupling reactions. This work paves a new avenue to the fabrication of advanced and tunable MOF-based catalysts through rational linker engineering. Graphical We encapsulate palladium nanoparticles in a series of isoreticular mixed-linker MOFs, and the obtained Pd-doped MOFs catalysts were used to unveil the electronic and steric effects of linker substitution on the activity of these catalysts in the context of Suzuki–Miyaura cross-coupling reactions. Impressively, m-6,6′-Me2bpy-MOF-Pd exhibits a remarkable enhancement in the activity compared to non-functionalized m-bpy-MOF-Pd and m-4,4′-Me2bpy-MOF-Pd, thus implementing atomic-level controls of heterogeneous catalysis.
      PubDate: 2018-01-18
      DOI: 10.1007/s10562-017-2289-9
       
 
 
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