Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 5)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 12)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 7)
Afrika Matematika     Hybrid Journal   (Followers: 3)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 4)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 1)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 6)
Algebra and Logic     Hybrid Journal   (Followers: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 10)
American Journal of Mathematical Analysis     Open Access   (Followers: 2)
American Journal of Mathematical and Management Sciences     Hybrid Journal   (Followers: 1)
American Journal of Mathematics     Full-text available via subscription   (Followers: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 17)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 8)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Mathematics     Full-text available via subscription   (Followers: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 2)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 4)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 24)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 2)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription   (Followers: 3)
British Journal for the History of Mathematics     Hybrid Journal  
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 14)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 4)
Bulletin of Dnipropetrovsk University. Series : Communications in Mathematical Modeling and Differential Equations Theory     Open Access   (Followers: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 3)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access   (Followers: 2)
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 23)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 17)
Commentarii Mathematici Helvetici     Hybrid Journal  
Communications in Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 5)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 8)
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
Catalysis in Industry
Journal Prestige (SJR): 0.258
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2070-0555 - ISSN (Online) 2070-0504
Published by Springer-Verlag Homepage  [2658 journals]
  • Conversions of Ethane and Ethylene with Methane on a Resistive Fechral
           Catalyst in the Presence of Hydrogen

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      Abstract: The conversion of methane–ethane, methane–ethylene, hydrogen–ethane, and hydrogen–ethylene mixtures on an electrically heated resistive fechral catalyst is studied. In the course of conversion, the catalyst surface is covered with graphite-like carbon deposits that have an additional catalytic effect resulting in the formation of C3 and C4 hydrocarbons. The latter are apparently formed with participation of ethylene formed from ethane. Hydrogen suppresses coking on the catalyst’s surface and reduces the yield of C3 and C4 hydrocarbons.
      PubDate: 2021-07-01
       
  • Modeling the Synthesis of Nitrous Oxide in a Microchannel Reactor: Effect
           of Parameters on Temperature Regimes and Capacity

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      Abstract: A study on the synthesis of nitrous oxide via the selective oxidation of ammonia in a microreactor in the form of a metallic disk with cylindrical channels filled with a manganese–bismuth oxide catalyst has been. A 3D mathematical model is presented for this microreactor that considers the transfer of mass and axial and radial heat, the catalytic reactions, the change they produce in the volume of the reaction mixture, the transfer of heat between the disk and the channels, and the heat conductivity of the disk. Parameters are determined that ensure the maximum nitrous oxide production with allowance for the limitations of temperature in the microreactor channels. The highest efficiency of nitrous oxide production is attained at an outer reactor edge temperature of 370°C and an inlet ammonia concentration of 20 vol %. The production capacity per unit catalyst volume in the microreactor is nearly 1.5 times higher than in a tubular reactor, and the maximum temperature corresponds to the level that provides the best process selectivity toward nitrous oxide.
      PubDate: 2021-07-01
       
  • Effect of Treatment with Sodium Carbonate and Hydrogen on the Activity and
           Selectivity of Pd-Containing Polymer Catalysts for the Hydrogenation of
           Acetylene Compounds

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      Abstract: The catalytic hydrogenation of a carbon–carbon triple bond in acetylene compounds is an important industrial process in which high selectivity toward olefin compounds must be ensured. This work considers the effect of treating palladium catalysts based on hyper-cross-linked polystyrene (HPS) with sodium carbonate on the activity and selectivity in the hydrogenation of 2-methyl-3-butyn-2-ol and phenylacetylene is considered. The effect of such treatment depends on the palladium precursor and the polymer support (HPS non-functionalized or HPS containing tertiary amino groups). Selectivity in the hydrogenation of 2-methyl-3-butyn-2-ol (95% conversion of the substrate) is 98% at ambient hydrogen pressure and 90°C in toluene for 1%-Pd/HPS catalysts treated with Na2CO3 and 99.5% in the hydrogenation of phenylacetylene.
      PubDate: 2021-07-01
       
  • Catalysts for the Direct Synthesis of Organotin Compounds, Part 1:
           Reactions between Organohalides and Tin Alloys

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      Abstract: This review is the first part of a series of reviews devoted to the direct synthesis of organotin compounds. The conditions for and results from the reaction between tin alloys and organohalides are considered. The efficiency of catalysts and the prospects for using tin alloys in the synthesis of organotin compounds are analyzed, and some possible mechanisms of these processes are discussed.
      PubDate: 2021-07-01
       
  • Effect of Carbon Monoxide on the Oxidation of Propane on Pt Glass Fiber
           Catalyst

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      Abstract: The deep oxidation of hydrocarbons on platinum catalysts underlies most processes for cleaning gas emissions from industrial enterprises. Since carbon monoxide is usually present in exhaust gases, it is important to study its effect on the kinetics of hydrocarbon oxidation. This work presents results from studying the kinetics of propane oxidation on a platinum glass fiber catalyst with and without CO in the reaction mixture. It is found that CO strongly inhibits the oxidation of propane at low temperatures. The effect of CO changes from negative to positive as the temperature rises. Numerical modeling shows the multidirectionality of the effect can be explained by competition between the adsorption of oxygen, propane, and CO on the active sites of the catalyst.
      PubDate: 2021-07-01
       
  • γ-Valerolactone as a Promising Solvent and Basic Chemical Product:
           Catalytic Synthesis from Plant Biomass Components

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      Abstract: γ-Valerolactone (GVL) is a valuable chemical compound known as a platform molecule. It is considered as an intermediate product for the synthesis of chemical compounds with high added value, components of motor fuels, and biopolymers. GVL is well established as an environmentally safe solvent, fuel additive, flavoring, and nutritional supplement. This review summarizes the latest advances in the development of catalytic ways of GVL synthesis from levulinic acid (LA), alkyl levulinates (ALs), and carbohydrates and plant polymers. Special attention is given to heterogeneous catalysts based on metals and metal oxides, which are more promising for practical application. Proposed mechanisms of the processes are considered in detail, and the prospect of using hydrogen-donor solvents in the processes of GVL production is discussed. Catalysts demonstrating the best catalytic properties are compared from the viewpoint of their productivity, an important parameter for industrial catalysis.
      PubDate: 2021-07-01
       
  • Thermocatalytic Decomposition of Methane on Carbon Materials and Its Use
           in Hydrogen Energy Technologies

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      Abstract: It is important today to find ways for the synthesis of hydrogen such as to avoid emissions of carbon oxides into the atmosphere and ensure the use of so-called low-carbon energy. Producing hydrogen through the thermocatalytic methane decomposition (CMD) on carbon catalysts yields not only a valuable, environmentally friendly fuel in the form of hydrogen, but also a wide range of carbon materials that can be used in a number of industries. The use of carbon catalysts is essential for the economic efficiency of methane decomposition. This paper describes the CMD fundamentals and summarizes results from studying the catalytic activity in this process for carbon materials (activated carbon, carbon black, nanotubes, nanofibers) that differ in structure and physical and chemical properties. The main problems and prospects of using this technology are identified.
      PubDate: 2021-07-01
       
  • Features of the Liquid-Phase Oxidation of Alkenes to Carbonyl Compounds in
           the Presence of Palladium Compounds

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      Abstract: Some specific features in the liquid-phase oxidation of alkenes to ketones or aldehydes in the presence of palladium compounds (Wacker oxidation) are discussed. It is shown that selecting the appropriate conditions of the reaction (the effective compositions of the catalyst, the oxidizing agent, and solvent) allows the selective synthesis of either ketones or aldehydes from terminal alkenes and ketones from internal alkenes.
      PubDate: 2021-07-01
       
  • Bifunctional Cobalt Catalyst for the Synthesis of Waxy Diesel Fuel by the
           Fischer–Tropsch Method: From Development to Commercialization. Part 1:
           Selection of the Industrial Sample of the Zeolite Component HZSM-5

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      Abstract: The effect of the quality of Russian commercial zeolites HZSM-5 of various grades on the properties of a bifunctional cobalt catalyst in the form of a composite mixture used in the Fischer–Tropsch synthesis was studied. The activities and selectivities of the catalyst samples were compared. The fractional and hydrocarbon composition of the synthesis products was investigated. The viscosity and temperature characteristics of the diesel fraction of fuel were determined. A promising sample of zeolite HZSM-5 was chosen for practical implementation of the catalytic technology.
      PubDate: 2021-07-01
       
  • Current Trends in the Processing of Linear Alpha Olefins into
           Technologically Important Products: Part 2

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      Abstract: This review continues Part 1, which considered current trends in the processing of linear alpha olefins to ethylene copolymers, and anionic and nonionic surfactants. This review also briefly outlines such importnant trends in the processing of LAOs as alkylation to linear alkylbenzenes, the oligomerization of alpha olefins into poly alpha olefins, sulfonation to alpha olefin sulfonates, and other large-scale processes.
      PubDate: 2021-07-01
       
  • Effect of Sibunite Graphitization on the Stability of Ru (Pt, Pd)/Sibunit
           Catalysts in an Oxidizing Atmosphere at Elevated Temperatures

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      Abstract: A study on the effect of high-temperature treatment has on the thermal stability of Sibunit, a graphite-like carbon material, under the conditions of an oxidative environment depending on the presence of the active component (Pt, Pd or Ru) has been performed. Thermal analysis results show that preliminary high-temperature treatment of Sibunit raises the temperature of the onset of carbon oxidation. It is found that keeping Ru/Sibunit samples in a nitrogen–air mixture (1 : 1) for 4 h at a temperature of 400°C results in partial destruction of Sibunit’s pyrocarbon framework and an increase in the average size of Ru particles. Using Ru as an example, it is shown that ruthenium catalysts can effectively oxidize CO at temperatures no higher than 200°C and withstand overheating up to 400°C with no appreciable loss of activity.
      PubDate: 2021-07-01
       
  • On Efficiency of Vanadium-Oxide Promoter in Cobalt Fischer-Tropsch
           Catalysts

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      Abstract: Promoters and their loading amount have crucial roles in cobalt Fischer-Tropsch catalysts. In this regard, the effects of vanadium oxide (V2O5) as a proposed promoter for Co catalyst supported on TiO2 have been investigated. Three catalysts with 0, 1, and 3 wt % of V2O5 promoter loading are prepared by the incipient wetness impregnation method, and characterized by the BET surface area analyzer, XRD, H2-TPR, and TEM techniques. The fixed-bed reactor was employed for their evaluations. It was found that the catalyst containing 1 wt % V2O5 has the best performance among the evaluated catalysts, demonstrating remarkable selectivity: 92% C5+ and 5.7% CH4, together with preserving the amount of CO conversion compared to the unpromoted catalyst. Furthermore, it is reported that the excess addition of V2O5 promoter (>1 wt %) in the introduced catalyst leads to the detrimental effect on the CO conversion and C5+ selectivity, mainly owing to diminished active sites by V2O5 loading.
      PubDate: 2021-04-01
       
  • Development of Catalysts for Hydroprocesses in Oil Refining

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      Abstract: The review presents an analysis of the scientific and technical level and tendencies in the development of modern imported and Russian catalysts for the main hydroprocesses of oil refining—hydrocracking of vacuum gas oil and hydrotreatment of various distillates (catcracked gasoline, diesel fuel, vacuum gas oil). Forecasts were made on prospects for the industrial production and mass use of Russian catalysts for hydroprocesses.
      PubDate: 2021-04-01
       
  • Production of Methacrylic Acid and Metacrylates

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      Abstract: The literature on the existing processes for the preparation of an important organic product, methacrylic acid and its ester, methyl methacrylate is analyzed. It is shown that the main method of their industrial production are synthesis from acetone and hydrocyanic acid (acetonecyanohydrin) and catalytic syntheses from petrochemical feedstocks (ethylene, propylene and isobutylene).
      PubDate: 2021-04-01
       
  • Modern Trends in the Processing of Linear Alpha Olefins into
           Technologically Important Products: Part I

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      Abstract: Linear alpha olefins (LAO) are a class of chemical compounds used in the production of such high-demand products as plasticizers, synthetic lubricants, surfactants, and co-polymers with improved performance. The world consumption of LAO derivatives grows annually, as does the role of LAO processing by scientific institutions, universities, and research departments of commercial companies. Analysis of the scientific literature of the last ten years revealed no general reviews of LAO processing. This work describes recent trends in the processing of LAOs that contain four or more carbon atoms into technologically important derivatives. It lists the main products obtained via LAO processing, along with the means of their production and applications. Existing technological processes for the production of LAO derivatives and the catalysts that are used are considered briefly. Current trends in LAO processing and promising ways to improve existing technologies are described, including the development of new types of catalysts. This review does not claim to be exhaustive, since its main purpose is to give a general idea of the major trends in LAO processing, the catalysts used in these processes, and current ways of improving them.
      PubDate: 2021-04-01
       
  • Methanol Steam Reforming on Cd–Zn/TiO2 and Cu–Zn/TiO2 Catalysts in a
           Microchannel Reactor

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      Abstract: New Cd–Zn/TiO2 and Cu–Zn/TiO2 catalysts based on nanodispersed titanium(IV) oxide are synthesized and characterized via X-ray diffraction analysis, low-temperature nitrogen adsorption, and temperature-programmed reduction with hydrogen. The activity of the synthesized catalysts in methanol steam reforming is studied under conditions of a microchannel reactor. It is shown that the highest activity is exhibited by Cd-containing catalysts, which are also characterized by the lowest carbon monoxide selectivity. The catalytic and physicochemical properties of the studied catalysts are compared. A correlation between the catalyst activity and the ability of Ti4+ cations in a TiO2 support to undergo partial hydrogen reduction to Ti3+ is shown. It is speculated that the reducibility of titanium cations depends on the semiconductor properties of the oxides in the catalyst.
      PubDate: 2021-04-01
       
  • Oxidation of Organic Substrates in Two-Phase Liquid Systems in the
           Presence of Tungsten Peroxo Complexes with the Formation of Carboxylic
           Acids

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      Abstract: A brief review is given for the results obtained by the authors at the Boreskov Institute of Catalysis when studying the processes of hydrogen peroxide oxidation for different organic compounds. Some basic catalytic systems for the synthesis of carboxylic acids as products in high demand by different branches of industry and fine organic synthesis are considered under conditions of phase-transfer catalysis. It is shown that the use of preliminarily synthesized catalytic complexes with general formula Q3{PO4[WO(O2)2]4} improves the process parameters, e.g., to increase the product yield, reduce the period of the reaction, reduce catalyst concentrations, compared to processes in which catalyst precursors are introduced into the reaction medium simultaneously with other reagents, and the active complex forms in situ.
      PubDate: 2021-04-01
       
  • Synthesis of Micro/Mesoporous Zeolite ZSM-5 Using a Natural
           Aluminosilicate

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      Abstract: A promising procedure is developed for preparing powder ZSM-5 zeolite with a high degree of crystallinity. The procedure is based on using a natural aluminosilicate as the main source of silicon and aluminum, and butanol as a template. It is shown that the porous structure of the synthesized zeolite not only has micropores, but mesopores as well.
      PubDate: 2021-04-01
       
  • Phenol-Formaldehyde Resins: Properties, Fields of Application, and Methods
           of Synthesis

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      Abstract: This review considers the current situation in the market of phenol-formaldehyde resins, which serve as a basis for a wide range of binders, whose properties can be varied to obtain different materials for certain technological problems. The properties, types, and application fields of phenol-formaldehyde resins are characterized, and their advantages, disadvantages, and more promising potential analogues are discussed. The relevance and prospects of studies on the development of new processes and the upgrading of existing ones for the production of phenol-formaldehyde resins by both varying the process conditions and selecting the best catalyst are shown.
      PubDate: 2021-04-01
       
  • Organotin Compounds in Industrial Catalysis III: Vulcanization of Blocked
           Isocyanates and Silicones

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      Abstract: This review is the third part of a series devoted to the use of organotin compounds as catalysts in a number of important industrial processes, such as (trans)esterification and polyurethane production. The third part covers the use of organotin compounds as catalysts for the vulcanization of blocked isocyanates and silicones.
      PubDate: 2021-04-01
       
 
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