Subjects -> COMPUTER SCIENCE (Total: 2313 journals)
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    - COMPUTER SCIENCE (1305 journals)
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COMPUTER SCIENCE (1305 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 27)
Abakós     Open Access   (Followers: 3)
ACM Computing Surveys     Hybrid Journal   (Followers: 29)
ACM Inroads     Full-text available via subscription   (Followers: 2)
ACM Journal of Computer Documentation     Free   (Followers: 4)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 5)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 11)
ACM SIGACCESS Accessibility and Computing     Free   (Followers: 2)
ACM SIGAPP Applied Computing Review     Full-text available via subscription  
ACM SIGBioinformatics Record     Full-text available via subscription  
ACM SIGEVOlution     Full-text available via subscription  
ACM SIGHIT Record     Full-text available via subscription  
ACM SIGHPC Connect     Full-text available via subscription  
ACM SIGITE Newsletter     Open Access   (Followers: 1)
ACM SIGMIS Database: the DATABASE for Advances in Information Systems     Hybrid Journal  
ACM SIGUCCS plugged in     Full-text available via subscription  
ACM SIGWEB Newsletter     Full-text available via subscription   (Followers: 2)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 3)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Asian and Low-Resource Language Information Processing (TALLIP)     Hybrid Journal  
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 10)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 11)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 15)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 9)
ACM Transactions on Computing for Healthcare     Hybrid Journal  
ACM Transactions on Cyber-Physical Systems (TCPS)     Hybrid Journal   (Followers: 1)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 5)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 11)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Internet of Things     Hybrid Journal   (Followers: 2)
ACM Transactions on Modeling and Performance Evaluation of Computing Systems (ToMPECS)     Hybrid Journal  
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Parallel Computing     Full-text available via subscription  
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 9)
ACM Transactions on Social Computing     Hybrid Journal  
ACM Transactions on Spatial Algorithms and Systems (TSAS)     Hybrid Journal   (Followers: 1)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 11)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 39)
Acta Informatica Malaysia     Open Access  
Acta Universitatis Cibiniensis. Technical Series     Open Access   (Followers: 1)
Ad Hoc Networks     Hybrid Journal   (Followers: 12)
Adaptive Behavior     Hybrid Journal   (Followers: 8)
Additive Manufacturing Letters     Open Access   (Followers: 3)
Advanced Engineering Materials     Hybrid Journal   (Followers: 32)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 9)
Advances in Artificial Intelligence     Open Access   (Followers: 31)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 20)
Advances in Computer Engineering     Open Access   (Followers: 13)
Advances in Computer Science : an International Journal     Open Access   (Followers: 18)
Advances in Computing     Open Access   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52)
Advances in Engineering Software     Hybrid Journal   (Followers: 26)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
Advances in Image and Video Processing     Open Access   (Followers: 20)
Advances in Materials Science     Open Access   (Followers: 19)
Advances in Multimedia     Open Access   (Followers: 1)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Remote Sensing     Open Access   (Followers: 59)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Advances in Technology Innovation     Open Access   (Followers: 5)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
AI EDAM     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 6)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 5)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 2)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 3)
Algebras and Representation Theory     Hybrid Journal  
Algorithms     Open Access   (Followers: 13)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 8)
American Journal of Computational Mathematics     Open Access   (Followers: 6)
American Journal of Information Systems     Open Access   (Followers: 4)
American Journal of Sensor Technology     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 15)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 4)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 14)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annual Reviews in Control     Hybrid Journal   (Followers: 7)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applied and Computational Harmonic Analysis     Full-text available via subscription  
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 17)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Clinical Informatics     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Computer Systems     Open Access   (Followers: 6)
Applied Computing and Geosciences     Open Access   (Followers: 3)
Applied Mathematics and Computation     Hybrid Journal   (Followers: 31)
Applied Medical Informatics     Open Access   (Followers: 11)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Soft Computing     Hybrid Journal   (Followers: 13)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Applied System Innovation     Open Access   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 97)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 7)
Array     Open Access   (Followers: 1)
Artifact : Journal of Design Practice     Open Access   (Followers: 8)
Artificial Life     Hybrid Journal   (Followers: 7)
Asian Journal of Computer Science and Information Technology     Open Access   (Followers: 3)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Research in Computer Science     Open Access   (Followers: 4)
Assembly Automation     Hybrid Journal   (Followers: 2)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 6)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 13)
Automatika : Journal for Control, Measurement, Electronics, Computing and Communications     Open Access  
Automation in Construction     Hybrid Journal   (Followers: 8)
Balkan Journal of Electrical and Computer Engineering     Open Access  
Basin Research     Hybrid Journal   (Followers: 7)
Behaviour & Information Technology     Hybrid Journal   (Followers: 32)
BenchCouncil Transactions on Benchmarks, Standards, and Evaluations     Open Access   (Followers: 3)
Big Data and Cognitive Computing     Open Access   (Followers: 5)
Big Data Mining and Analytics     Open Access   (Followers: 10)
Biodiversity Information Science and Standards     Open Access   (Followers: 1)
Bioinformatics     Hybrid Journal   (Followers: 216)
Bioinformatics Advances : Journal of the International Society for Computational Biology     Open Access   (Followers: 1)
Biomedical Engineering     Hybrid Journal   (Followers: 11)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 11)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 43)
British Journal of Educational Technology     Hybrid Journal   (Followers: 93)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
Cadernos do IME : Série Informática     Open Access  
CALCOLO     Hybrid Journal  
CALICO Journal     Full-text available via subscription  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Catalysis in Industry     Hybrid Journal  
CCF Transactions on High Performance Computing     Hybrid Journal  
CCF Transactions on Pervasive Computing and Interaction     Hybrid Journal  
CEAS Space Journal     Hybrid Journal   (Followers: 6)
Cell Communication and Signaling     Open Access   (Followers: 3)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 4)
CERN IdeaSquare Journal of Experimental Innovation     Open Access  
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chip     Full-text available via subscription   (Followers: 2)
Ciencia     Open Access  
CIN : Computers Informatics Nursing     Hybrid Journal   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 16)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Clinical eHealth     Open Access  
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 2)
Cognitive Computation and Systems     Open Access  
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 29)
Communications in Algebra     Hybrid Journal   (Followers: 1)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 2)
Communications of the ACM     Full-text available via subscription   (Followers: 59)
Communications of the Association for Information Systems     Open Access   (Followers: 15)
Communications on Applied Mathematics and Computation     Hybrid Journal   (Followers: 1)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 4)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 11)
Computational Astrophysics and Cosmology     Open Access   (Followers: 6)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computational Biology Journal     Open Access   (Followers: 6)
Computational Brain & Behavior     Hybrid Journal   (Followers: 1)
Computational Chemistry     Open Access   (Followers: 3)
Computational Communication Research     Open Access   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Condensed Matter     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Similar Journals
Journal Cover
Catalysis in Industry
Journal Prestige (SJR): 0.258
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2070-0555 - ISSN (Online) 2070-0504
Published by Springer-Verlag Homepage  [2469 journals]
  • Conversion of Methanol to Olefins: State-of-the-Art and Prospects for
           Development

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      Abstract: The production of olefins via the catalytic conversion of methanol on zeolites and zeotypes is of great interest to both the scientific community and specialists in related areas of the national economy. Due to the gradual industrial implementation of the above process, the focus of attention is gradually shifting from scientific research devoted to the synthesis and modification of zeolites and zeotypes of different structures; to studies of pilot and industrial installations; to determining the main economic and environmental indicators, both existing and planned; and to the construction of production facilities. In 2019 alone, China licensed the construction of 26 production sites with a capacity of 14 million t/yr for ethylene and propylene, and commissioned 14 enterprises with a total capacity of 7.67 million t/yr for ethylene and propylene. The established production facilities include a full cycle of coal processing that consists of coal gasification units for the production of synthesis gas; units for the production and purification of methanol and olefins; and units for the production of polyethylene and polypropylene. The total productivity of the commissioned plants is more than 21 million t/yr for ethylene and propylene. This work reviews sources published in the foreign literature over the past five years on the preparation and modification of catalysts, along with technological, economic, and environmental aspects of the production of olefins from methanol.
      PubDate: 2022-03-01
       
  • Modern Level of Catalysts and Technologies for the Conversion of Natural
           Gas into Syngas

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      Abstract: The level of the main catalysts and industrial technologies for the conversion of natural gas into syngas further convrted into ammonia, methanol, and H2 was analyzed. The main trends in their development, aimed at reducing the energy and resources consumption, were described including process flowsheets, catalysts, and sorbents at different stages of methane reforming and CO steam reforming.
      PubDate: 2022-03-01
       
  • Contemporary Trends in Methanol Processing

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      Abstract: The current structure of the production and consumption of methanol is reviewed. The main processes of methanol processing and catalysts for their implementation are highlighted: the production of formaldehyde, hydrocarbons (MTH), olefins (MTO), and the production of hydrogen from methanol by means of steam reforming, partial oxidation, autothermal reforming, and decomposition.
      PubDate: 2022-03-01
       
  • State-of-the-Art in the Industrial Production and Use of
           Zeolite-Containing Adsorbents and Catalysts in Russia

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      Abstract: The ways for the production of zeolite powders, which are currently manufactuired on an industrial scale, and their conversion into grained zeolite-containing adsorbents and catalysts are studied. Some data on the Russian manufacturers of these materials are presented. A brief overview on the utilization of these materials in adsorption drying, the purification and separation of gaseous and liquid media, and the catalytic processing of hydrocarbons in Russia and worldwide is given.
      PubDate: 2022-03-01
       
  • State-of-the-Art and Achievements in the Catalytic Conversion of Natural
           Gas into Valuable Chemicals

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      Abstract: The state-of-the art in the catalytic conversion of natural gas containing methane as the main component to valuable chemicals and fuels is reviewed. Methane conversion processes are of considerable importance to society; like oil, they are sources of energy, fuels, and chemicals. Direct and indirect means of methane conversion are discussed. Direct methane conversion processes are commonly thought of as the Holy Grail of modern research, since the methane molecule is extremely stable. Ways of producing synthesis gas, methanol, ethylene, formaldehyde, benzene, and other compounds are considered. The main emphasis is on processes of direct methane conversion (methane dehydroaromatization). Catalysts and the conditions for their synthesis are described, the state of active sites is studied, and a mechanism of methane dehydroaromatization is proposed. The reasons for catalyst deactivation and means of catalyst regeneration mechanism are described. The review helps summarize recent advances in heterogeneous catalysis in the field of natural gas conversion.
      PubDate: 2022-03-01
       
  • An Essay on the History of Catalytic Hydrogenation of Organic Compounds.
           From P. Sabatier and V. N. Ipatieff to the Present Days

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      Abstract: The essay considers historical aspects of the appearance and development of methods for catalytic hydrogenation of organic compounds, starting from the works by P. Sabatier and V.N. Ipatieff. Particular attention is paid to the results of synthesis and investigation of hydrogenation metal catalysts based on Ni, Pd and Pt since they are significant for practical application. Modern trends and promising lines of investigation in the field of hydrogenation processes and catalysts are revealed.
      PubDate: 2022-03-01
       
  • Technology for the Multifunctional Hydrothermal Treatment of Oil Residues
           (Mazut and Tar) on Catalysts with a Hierarchical Structure of Pores

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      Abstract: A technology is proposed for the catalytic hydrothermal treatment of oil residues (mazut and tar) for the synthesis of high added value products, including marine fuel, that satisfy the contemporary technical and environmental requirements. The technology is based on using catalysts on an alumina support with a hierarchical structure of meso- and macropores and a high stability under severe process conditions. Data are presented from a physicochemical analysis of the chemical composition, textural and phase properties of fresh and waste catalysts for the three-stage processes of the hydrothermal treatment of mazut and tar. Variants of the implementing and combining this technology at Russian oil refineries to increase profits from oil refining are proposed on the basis of the material balance of each stage of these processes and the complex analysis of properties for the formed oil products. Introducing mazut hydrothermal treatment at oil refineries without secondary processes would improve the economic efficiency of mazut utilization by 84–170%, depending on the chosen process layout and the product box required for an enterprise. Tar hydrothermal treatment can be combined with the processes of delayed coking, catalytic cracking, and hydrocracking to increase the depth of treatment to 95% and enhance the production of such high-demand oil refining products as gasoline, diesel fuel, and marine fuel with sulfur contents of less than 0.5% and low-sulfur oil coke for the electrode manufacturing industry. The integration of tar hydrothermal treatment with secondary processes would improve the economic efficiency of tar utilization by 2–2.5 times, relative to delayed coking plants.
      PubDate: 2022-03-01
       
  • Catalytic Methods for the Synthesis of Sugar Esters

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      Abstract: Nowadays, sugar esters (SEs) have become the focus of researchers due to their biocompatibility and extensive industrial applications as surfactants. This trend provides new methods and opportunities for the development of green synthetic chemistry. Taking the above into consideration, a critical review presented in this work emphasized the efficiency of catalyzing the synthesis of SEs with minimal hazardous by-products. Catalytic media have been employed with various impacts involving chemical, biological, and other catalytic materials. Chemical methods have been reported to show limitations in terms of preparation and biocompatibility. To solve these shortcomings, therefore, other technologies have been adopted: ionic liquids (eutectic solvents), chemo-enzymatic systems and chemo-enzymatic systems on a catalytic surface. The use of chemo-enzymatic systems on catalytic surfaces has proved to be suitable in solving biocompatibility and stability problems and correspondingly increasing the yield of esters formed. Therefore, finding an improved catalytic surface, and the sustainable optimal reaction conditions for enzymes will be vital to improving sugar ester conversion. This study highlights the different catalytic advances employed in the esterification of SEs.
      PubDate: 2022-03-01
       
  • Gas-Phase Oxidation of Natural and Associated Gases

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      Abstract: A study on the growing importance of gas chemistry to the world economy and the resulting need to create new catalytic and non-catalytic technologies for converting natural gas and other hydrocarbon gases into chemical products is performed. Existing and promising non-catalytic processes of converting them into synthesis gas are discussed, along with direct ways of obtaining chemical products from methane, the main component of natural gas.
      PubDate: 2022-03-01
       
  • Promotion of Supported Sulfated Zirconia Catalysts with Iron and Manganese
           Sulfates

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      Abstract: The effect of iron and manganese additives on the textural characteristics and phase composition of the alumina matrix support was studied for sulfated zirconia catalysts of hexane isomerization. The additives introduced at the stage of plastification of aluminum hydroxide significantly improved the catalyst activity (hexane conversion and selectivity of isomerization to hexane isomers). A distinction of the modified catalysts is the formation of acid sites in a ratio of LAS : BAS ≥ 2, which increase the yield of isomers and especially of high-octane 2,2-dimethylbutane.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040103
       
  • Selective Catalytic Hydrogenation of Triple Bonds in Acetylenic Alcohols
           in a Microcapillary Reactor for Processes of Fine Organic Synthesis

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      Abstract: A report is given on the recent advances in the design, synthesis, and development of a new catalytic microreactor for the selective and continuous synthesis of value-added substances used in fine organic synthesis and pharmaceutical industry. Inside this advanced reactor, metal nanoparticles are incorporated into mesoporous materials that are deposited as very active and selective catalytic films on the walls of capillary microchannels with diameters of 220 and 530 µm. These microreactor systems require no subsequent separation of the catalyst, which allows their continuous operation. Crystalline and amorphous metal oxides based on titanium dioxide synthesized using the sol gel technique and containing catalytically active polymetallic nanoparticles are potentially the most stable coatings. The catalytic properties and operational stability of capillary microreactors are studied at atmospheric pressure and compared to those of conventional industrial batch reactors. Our Pd50Zn50/TiO2 coating displays higher activity (1.5 gMBE/(gPd s)) and selectivity (96.7%) than coatings described earlier, and retains high catalytic performance after 88 h of a reaction with Lindlar’s industrial catalyst.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040073
       
  • Mononuclear Iron(III) Piperazine-Derived Complexes and Application in the
           Oxidation of Cyclohexane

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      Abstract: Oxygenated products from selective hydrocarbon oxidation have high commercial value as industrial feedstocks. One of the most important industrial processes is the cyclohexane oxidation to produce cyclohexanol and cyclohexanone. These organic substances have special importance in the Nylon manufacture as well as building blocks for a variety of commercially useful products. In this work we present the synthesis and characterization of a new mononuclear piperazine-derived series of iron(III) complexes and their catalytic activity towards cyclohexane oxidation essays. All complexes present octahedral high-spin iron(III) center according to elemental analysis, FTIR, UV-VIS and Mössbauer spectroscopy characterization. The cyclohexane oxidation resulted in cyclohexanol, cyclohexanone and cyclohexyl hydroperoxide as products, with yields up to 39%. The best results were obtained with the complex (NH4)[Fe(BPPZ)Cl2] (BPPZ: lithium 1,4-bis(propanoate)piperazine) and with hydrogen peroxide as oxidant. The reactions were carried out at room temperature and atmospheric pressure, which incomes a great advantage over the current industrial process of cyclohexane production.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040036
       
  • Nickel- and Molybdenum-Containing Catalysts for Direct Synthesis of
           Propylene from Ethylene: Effect of the Support

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      Abstract: Polyfunctional Ni- and Mo-containing catalysts are prepared by sequentially impregnating a support (SiO2, Al2O3, B2O3–Al2O3, \({\text{SO}}_{4}^{{2 - }}\) /Al2O3, \({\text{SO}}_{4}^{{2 - }}\) /ZrO2) using solutions of corresponding salts with intermediate steps of drying at 120°C and calcination at 500–550°C. X-ray powder diffraction, temperature programmed reduction, UV-VIS diffuse reflectance spectroscopy, and electron spin resonance spectroscopy are used to study physicochemical properties of the prepared catalysts. The catalysts are tested in the direct synthesis of propylene from ethylene at an atmospheric pressure, 200°C and an ethylene weight hourly space velocity of 0.5 h−1. The highest conversion of ethylene and yield of propylene are achieved for a sample based on borated alumina, due to the formation of active sites of ethylene dimerization, Ni2+ ions bound to acid sites of the support, and active sites of metathesis (surface monomolybdate compounds).
      PubDate: 2021-10-01
      DOI: 10.1134/S207005042104005X
       
  • Use of Fluorinated Alumina as a Support for the Sulfated Zirconia Catalyst
           of Hexane Isomerization

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      Abstract: The effect of fluorine addition to the alumina matrix used for the preparation of supported sulfated zirconia catalysts has been studied. The fluorinating agent was hydrofluoric acid. Fluorine additions affect the textural characteristics of the Al2O3 matrix and, as a consequence, the surface area of sulfated zirconia catalysts based on modified systems. The introduction of fluorine in the catalyst composition to an increase in the activity (conversion of hexane) and yield of the high-octane isomer 2,2-dimethylbutane.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040115
       
  • Study of Carbon Dioxide Hydrogenation to Hydrocarbons Over Iron-Based
           Catalysts: Synergistic Effect

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      Abstract: Hydrogenation of CO2 to CO and hydrocarbons is carried out over a wide range of catalysts. Group of VIIIB transition metals have proved high conversion and selectively for CO and methane. Meanwhile, low cost and effective catalysts are preferable in an industrial scale. In this work, the synergistic effect of iron content on the catalytic performance were investigated in carbon dioxide hydrogenation reaction. Incipient wetness impregnation procedure was used for the preparation of four γ-Al2O3 supported iron-based catalysts. BET, XRD, H2-TPR and TEM techniques were employed for the catalyst characterization. The evaluation of catalysts were carried out in a fixed bed reactor at the process conditions of temperature of 300°C, pressure of 20 atm, H2 to CO2 ratio of 3 and GHSV of 3 NL/(h gCat). It was found that the promoter addition improves the activity of Fe catalyst for both Fischer-Tropsch synthesis (FTS) and Reverse Water Gas Shift (RWGS) reactions. The results showed that conversion of CO2 was from 15.6 to 35.6% with major products of methane, C2 to C4, C5+ and CO. It was also found that impact of K and Ce promoters into iron catalyst showed the highest conversion and hydrocarbon yield due to the synergistic effect.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040085
       
  • Oligomerization of Ethylene to Linear α-Olefins Using Complex Catalytic
           Systems of Zirconium Carboxylate

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      Abstract: The oligomerization of ethylene in aliphatic and aromatic solvents on complex zirconium carboxylate catalytic systems obtained from naphthenic acid fractions isolated from Baku oils is studied for the first time. Comparative studies are performed using complex zirconium carboxylate catalytic systems obtained from individual carboxylic acids CH3(CH2)2COOH and CH3(CH2)8COOH. It is found that the activity of a catalyst and the molecular weight distribution (MWD) of oligomeric products depend mainly on the solvent and the composition of the zirconium complex. It is shown that the rate of ethylene oligomerization when using zirconium carboxylate catalytic systems in aliphatic solvents is 2–3 times lower than in aromatic solvents. The resulting product has a narrow MWD and consists mainly of C4–C10 fractions. The oligomeric products obtained in aromatic solvents have wide MWDs and consist mainly of C4–C18 in the presence of zirconium carboxylates and of C12–C18 and C20 fractions with zirconium naphthenates.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040048
       
  • Catalysts in the Direct Synthesis of Organotin Compounds, Part 2:
           Reactions between Alkyl Halides and Metallic Tin

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      Abstract: The second part of a series of reviews on the direct synthesis of organotin compounds is presented. In this part, the conditions and results of the reaction between metallic tin and allkyl halides are considered. The efficiency of application is analyzed for different catalysts along side with their systematization, and some possible mechanisms of these processes are discussed.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040127
       
  • Effect of Tungsten Oxide Content in Pt/WO3-ZrO2 Catalysts on the
           Performance Characteristics of the Heptane–Benzene Mixture
           Hydroisomerization Reaction

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      Abstract: The effect of the tungsten oxide content (10–35 wt %) in Pt/WO3-ZrO2 catalysts on hydroisomerization of a heptane–benzene mixture (80 : 20, wt %) has been studied. The catalysts with 15–25 wt % WO3 are characterized by the highest fraction of the tetragonal phase of zirconia (t-ZrO2, 87–96%), which makes it possible to achieve the highest yield of the sum of heptane isomers, including high-octane di- and trimethyl-substituted isomers (DTMS; 69.4–76.7 and 24.5–27.9 wt %, respectively). In the presence of these catalysts, the yield of methylcyclopentane is 52.1–61.3 wt % at 72.6–90.9% selectivity of isomerization of cyclohexane to methylcyclopentane.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040097
       
  • Effect of the Indium Introduction Method on the Properties of the
           Pt/In/Al2O3–Cl Reforming Catalysts

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      Abstract: The effect of 0.3 wt % of indium introduced at the peptization and aluminum oxide impregnation stages on the properties of alumina-platinum reforming catalysts has been studied. Modification with indium at the impregnation stage reduces the total acidity of the support to a lesser extent and, as a consequence, the conversion of heptane for the corresponding Pt/In/Al2O3-Cl catalyst. This sample demonstrates the greatest decrease in the selectivity of the hydrogenolysis and hydrocracking reaction alongside with a maximum ratio of i-C5–7/toluene selectivities as compared to the catalysis doped with In at the peptization stage and without doping.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040139
       
  • Synthesis of Erythrulose from Dihydroxyacetone and Formaldehyde Using Zinc
           Zeolitic Imidazolate Frameworks

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      Abstract: A study is performed for the aldol condensation of formaldehyde with dihydroxyacetone (DHA) in an aqueous medium (pH 7.54–8.71) at 65–80°C using zinc zeolitic imidazolate frameworks based on 2-methylimidazole (ZIF-8) and 2-ethylimidazole (MAF-5 and MAF-6). It is shown that the selectivity of the process depends on the pH of the reaction solution, which is controlled by the temperature of the reaction and the amount of catalyst in the reaction mixture. There are high yields of C6 sugars when the reaction is conducted at pH 8.36 and 80°C. The sugars are accompanied by high yields of erythrulose (39–60%) at a temperature of 65°C and. It is found that the yield of erythrulose when using the studied catalytic systems depends on the pore radius and grows in the order MAF-6 > MAF-5 > ZIF-8. The advantages of the studied systems are compared to those of homogeneous and heterogeneous phosphate systems proposed in the literature.
      PubDate: 2021-10-01
      DOI: 10.1134/S2070050421040061
       
 
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