Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 3)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 16)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 4)
Advances in Fixed Point Theory     Open Access  
Advances in Geosciences (ADGEO)     Open Access   (Followers: 21)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 7)
Advances in Materials Science     Open Access   (Followers: 23)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 18)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Operator Theory     Hybrid Journal  
Advances in Pure Mathematics     Open Access   (Followers: 10)
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: 8)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
Afrika Matematika     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 7)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access  
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 3)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 4)
Algebra and Logic     Hybrid Journal   (Followers: 9)
Algebra Colloquium     Hybrid Journal   (Followers: 3)
Algebra Universalis     Hybrid Journal   (Followers: 3)
Algorithmic Operations Research     Open Access   (Followers: 7)
Algorithms     Open Access   (Followers: 15)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access   (Followers: 1)
American Journal of Mathematical and Management Sciences     Hybrid Journal  
American Journal of Mathematics     Full-text available via subscription   (Followers: 8)
American Journal of Operations Research     Open Access   (Followers: 6)
American Mathematical Monthly     Full-text available via subscription   (Followers: 3)
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: 7)
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 3)
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 Functional Analysis     Hybrid Journal   (Followers: 2)
Annals of Mathematics     Full-text available via subscription   (Followers: 5)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 13)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 5)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access   (Followers: 1)
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: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 17)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 7)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 4)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 22)
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: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 5)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
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  
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access  
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
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  
British Journal for the History of Mathematics     Hybrid Journal   (Followers: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 18)
British Journal of Mathematics & Computer Science     Full-text available via subscription   (Followers: 1)
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 3)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 3)
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: 4)
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  
Calculus of Variations and Partial Differential Equations     Hybrid Journal   (Followers: 1)
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 20)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access  
Catalysis in Industry     Hybrid Journal  
CAUCHY     Open Access   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 5)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
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: 2)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access  
CODEE Journal     Open Access  
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 5)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 22)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 3)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 6)
Complex Analysis and its Synergies     Open Access   (Followers: 1)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Compositio Mathematica     Full-text available via subscription   (Followers: 2)
Comptes Rendus : Mathematique     Open Access  
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: 2)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 12)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 12)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access  
Contributions to Discrete Mathematics     Open Access  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cross Section     Full-text available via subscription   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 11)
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  
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access  
Demographic Research     Open Access   (Followers: 14)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access  
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 3)
Differentsial'nye Uravneniya     Open Access  
Digital Experiences in Mathematics Education     Hybrid Journal   (Followers: 3)
Discrete Mathematics     Hybrid Journal   (Followers: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access   (Followers: 1)
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Diskretnaya Matematika     Full-text available via subscription  
Doklady Akademii Nauk     Open Access  

        1 2 3 4 | 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  [2467 journals]
  • Dust Collector for Paraffin Dehydrogenation Units with a Fluidized
           Catalyst Bed

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      Abstract: The problem of trapping solid particles in a production line with dehydrogenation of C4–C5 isoparaffins to iso-olefins in a fluidized catalyst bed was considered. Dust collection of fine catalyst particles for paraffin dehydrogenation units using a standard TsN-15 cyclone and a new dust collector (NDC) with arc-shaped elements was studied. The results of numerical simulation of TsN-15 and NDC were presented. Comparative studies showed NDC to be more efficient than TsN-15 for trapping fine solid particles with sizes of less than 20 μm. The pressure and flow velocity profiles for NDC were shown to change as a regular tendency, without any critical deviations. The gas flow velocity through the arc-shaped NDC elements was shown to be stable in contrast to TsN-15, which creates high flow velocities at the cyclone periphery to increase the probability of dust breakthrough into the flow.
      PubDate: 2022-12-01
       
  • Key Intermediates in the Hydrogenation of Carboxylic Acids on the
           Pt–ReOx/TiO2 Catalyst

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      Abstract: The reactivity of adsorbed acetic acid forms on the Pt–ReOx/TiO2 catalyst has been studied. Three adsorbed acetic acid forms were identified by in situ Fourier IR spectroscopy at 200°С: bidentate acetates and two forms of molecularly adsorbed acetic acid. The consumption rate constants two forms of molecularly adsorbed acetic acid (0.02 and 0.029 s–1, respectively) were found to be close in magnitude to the catalytic reaction constant rate (0.034 s–1) measured at 200°С. It was concluded that these two forms of molecularly adsorbed acetic acid are key intermediates in acetic acid hydrogenation on the Pt–ReOx/TiO2 catalyst.
      PubDate: 2022-12-01
       
  • Sorption-Enhanced Water Gas Shift Reaction over a Mechanical Mixture of
           the Catalyst Pt/Ce0.75Zr0.25O2 and the Sorbent NaNO3/MgO

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      Abstract: Results of studying the sorption-enhanced water gas shift reaction over a mechanical mixture of grains of 5 wt % Pt/Ce0.75Zr0.25O2 catalyst and 10 wt % NaNO3/MgO sorbent are presented. It is shown that pure magnesium oxide sorbs virtually no СО2 under model conditions, while its promotion with NaNO3 substantially improves the dynamic sorption capacity in the 300–350°C range of temperatures with a maximum at 320°C. The catalyst shows high activity and selectivity in the water gas shift reaction for a model mixture (CO, 11.6; H2, 61; H2O, 27.4 vol %). The concentration of CO at the outlet from the reactor is less than 1 vol % in the 220–400°C range of temperatures (the minimum is 0.3 vol % at 240°C) with СН4 at the temperatures below 320°C (0.61 vol % at this point). Using this sorbent in mixtures with a catalyst in the sorption-enhanced water gas shift reaction at 320°C substantially reduces its sorption capacity, due probably to the full conversion of NaNO3 into Na2CO3 that is not completely decomposed at the stage of regeneration. This nevertheless allows the outlet СО and СН4 concentrations to be halved, relative to values observed at this temperature in experiments with no sorbent: 6.1 × 10−4 and 8.2 × 10−2 vol % per dry gas basis at the middle of the first adsorption cycle. Prospects for using this approach in the sorption-enhanced water gas shift reaction and the need for further studies on improving the capacity and stability of the presented sorbents are described.
      PubDate: 2022-12-01
       
  • Catalytic Conversion of Flare Gas on Rh Catalysts with Subsequent Direct
           Monetization

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      Abstract: The technical feasibility of the direct monetization of associated petroleum gas currently burned is considered. The proposed approach is based on the low-temperature steam reforming of hydrocarbons, with which flare gases can be brought to meet the requirements for fuel used in gas piston and turbine power plants. The preparation and catalytic properties of new rhodium-based catalysts for low-temperature steam reforming of flare gas are discussed. Mixed cerium zirconium oxides are the most promising catalyst supports. Such catalysts have a number of advantages over the known nickel catalysts in the low-temperature steam reforming of hydrocarbons.
      PubDate: 2022-12-01
       
  • Production of Monomers on the Basis of Catalytic Dehydrogenation Processes
           at Nizhnekamskneftekhim

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      Abstract: The processes for the production of basic monomers at Nizhnekamskneftekhim via dehydrogenation are described. The cooperative development of modern domestic catalysts with the Kazan Federal University is emphasized. The disadvantages of existing catalytic systems are considered, and the possivle ways of their elimination are presented.
      PubDate: 2022-12-01
       
  • Comparative Analysis of the Properties of Biocatalysts Based on
           Chymotrypsin Immobilized on Polysaccharide Supports

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      Abstract: The effect of the type of polysaccharide support for immobilization and encapsulation on the stability of chymotrypsin was studied. The synthesized biocatalysts were compared according to their proteolytic activity. The cellulose–chitosan composite was found to have the highest proteolytic activity equal to 192 units/g. Immobilization was found to slightly change the optimum temperature and pH of chymotrypsin, but they substantially grew toward higher temperatures and alkaline pH values. The greatest relative increase in the activity of immobilized chymotrypsin was observed when using the cellulose–chitosan composite. The activity of chymotrypsin changed by no more than 45–50% during storage of the cellulose–chitosan and cellulose–alginate composites for 24 months. According to the results of our study, the cellulose–chitosan composite was the optimum support for immobilization of chymotrypsin.
      PubDate: 2022-12-01
       
  • Creating a Heterohomogeneous Catalytic System for the Alkylation of
           Benzene with Ethylene through the Reaction beteen Carbon Tetrachloride and
           Aluminum Alloys

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      Abstract: The in situ formation of a catalytic heterohomogeneous system containing Al–M alloy (M is Ni, Co, Cu) and Al(M)/Cl complex in a benzene–ethylene medium at a temperature of 80°C and a pressure of 0.2–0.3 MPa is studied. The characteristic patterns of interaction between Al–M alloys activated with a liquid metal Ga–In eutectic and a chlorinating agent (CCl4) with the formation of catalytically active metal–aluminum chloride Al(M)/Cl complexes are established. Results from spectrokinetic measurements show the order of the reactivity of activated alloys with respect to excess CCl4 is Al–Cu ≈ Al–Ni > Al > Al–Co. The highest catalytic activity is displayed by nickel–aluminum chloride complexes whose selectivity toward ethylbenzene is 48%. Data from IR and UV-VIS spectroscopy show that the structure and composition of metal chloride complexes formed in situ in the aromatic reaction medium is determined by a combination of coupled ionic pairs \([{\text{AlC}}{{{\text{l}}}_{4}}]_{{{\text{tetr}}}}^{ - }{\text{/[NiC}}{{{\text{l}}}_{{\text{6}}}}]_{{{\text{oct}}}}^{{4-}}\) and \(\left[ {{\text{AlC}}{{{\text{l}}}_{{\text{4}}}}} \right]_{{{\text{tetr}}}}^{ - }/\left[ {{\text{CuC}}{{{\text{l}}}_{{\text{2}}}}} \right]_{{{\text{lin}}}}^{ - }\) , which are stabilized by (C6H5)3C+ carbocation.
      PubDate: 2022-12-01
       
  • Changes in the Physicochemical and Catalytic Properties of
           Iron–Potassium Catalysts under Operation in a Reactor of Ethylbenzene
           Dehydrogenation to Styrene at Nizhnekamskneftekhim

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      Abstract: A study of original iron–potassium catalysts of ethylbenzene (EB) dehydrogenation to styrene and industrially used catalysts: Cat-1 (imported), Cat-2 and Cat-3 (domestic) is performed. Initial samples are multiphase systems consisting of potassium ferrites, hematite, and cerianite (CeO2). The phase composition of the catalysts after two years of operation consists mainly of magnetite and cerianite, while the amount of potassium (K+) in Cat-1, Cat-2, and Cat-3 samples falls by 40, 20, and 26%, respectively. At the same time, K+ for the Cat-2 sample is distributed uniformly in granules of the waste catalyst. XRD data indicate the CSR size of its CeO2 crystals does not change appreciably. The CSR size of CeO2 crystals in the Cat-3 sample falls from 302 to 110 Å, while it grows from 284 to 419 Å in the Cat-1 sample. After two years of operation, the greatest conversion of EB (72.1%) was observed for the Cat-2 sample, and it fell from 72.3 to 57.4% on the Cat-3 sample. There is a 600–1100% drop in the waste samples’ resistance to crushing, making them unsuitable for further use.
      PubDate: 2022-12-01
       
  • Hydrogenation of 1,3-Pentadiene on Modified Pd-Containing Catalysts

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      Abstract: The activity and selectivity of sulfidized and non- sulfidized palladium alumina supported catalysts in the hydrogenation of 1,3-pentadiene to pentenes is studied. Preliminary sulfidation of palladium catalysts substantially improves their selectivity toward olefins in a broad range of Н2 : diene ratios (from 2.5 to 10). Samples activated in Н2 at elevated temperatures display higher activity in diene hydrogenation. Palladium catalysts are more active at low temperatures of the reaction, but sulfidized Ni catalysts studied earlier are competitive with palladium ones in selectivity toward olefins and productivity, and are more selective in an excess of hydrogen. The modification of palladium with chromium, silver, or lithium improves the selectivity toward olefin.
      PubDate: 2022-12-01
       
  • Industrial Implementation of Developments: Experience from Cooperation
           with Nizhnekamskneftekhim

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      Abstract: The experimence from cooperation with industrial petrachemical and oil refining enterprises in implementation of developments is systematized. The important role of cooperation and interdisciplinary studies is highlighted, and the interaction between consumers and manufacturers of catalysts is considered. The most important stages of the development and implementation of catalysts are described.
      PubDate: 2022-12-01
       
  • Catalytic Diesel Exhaust Systems: Modern Problems and Technological
           Solutions for Modernization of the Oxidation Catalyst

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      Abstract: Diesel vehicles release not only soot and NOx into the environment, but also a wide range of organic and inorganic toxic compounds. The review discusses in detail the role of the oxidation catalyst in modern diesel exhaust purification systems, methods for improvement and optimization of oxidation catalysts designed for conversion of carbon monoxide and hydrocarbons, and methods for reducing the contents of Pt group metals in these catalytic systems.
      PubDate: 2022-09-01
      DOI: 10.1134/S2070050422030060
       
  • Acetylene Production Technologies in the 21st Century: Main Trends of
           Their Development in the Paradigm of Low-Carbon Economy of the Future

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      Abstract: This paper is a review of acetylene production technologies, which are both used for a long time in industry and currently at the stage of laboratiory studies and demonstration testbenches. The possibility of transition from acetylene production technologies accompanied by the formation of substantial amounts of greenhouse gases (carbide technology, oxidative natural gas pyrolysis) to low-carbon or carbon-free natural gas and coal plasmochemical processes using energy generated by renewable sources (wind and solar) is considered.
      PubDate: 2022-09-01
      DOI: 10.1134/S2070050422030023
       
  • Integrated Processes of the Reforming and Isomerization of Gasoline
           Fractions for the Production of Environmentally Friendly Motor Gasolines

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      Abstract: The data on the development and study of new catalysts for the reforming and isomerization of gasoline fractions from the Center of New Chemical Technologies BIC (Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences), including the experience in the industrial appliction of reforming catalyst PR-81, are presented. A new catalyst of increased acidity is developed for the reforming of gasoline fractions to ensure a 3–5 wt % reduction in the content of aromatic hydrocarbons in the reformate. A new sulfated zirconia catalyst supported on a porous alumina matrix is developed for the isomerization of the C5–C6 hydrocarbon fraction. An efficient catalyst based on tungstated zirconia is proposed for isomerization of the С7 hydrocarbon fraction. A flowsheet of integrated reforming and isomerization processes is proposed on the basis of the new catalysts to ensure the production of Euro-5 and Euro-6 motor gasolines alongside promising gasolines with reduced contents of aromatic hydrocarbons.
      PubDate: 2022-09-01
      DOI: 10.1134/S2070050422030035
       
  • Catalysts in the Direct Synthesis of Organotin Compounds, Part III:
           Reactions between Carbofunctional Organohalides and Metallic Tin

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      Abstract: This work is the third and final part of a series of reviews devoted to the direct synthesis of organotin compounds. This part of the series considers the conditions of and results from the reaction between metallic tin and carbofunctional organohalides. The efficiency of catalysts and the prospects for direct synthesis in the production of carbofunctional organotin compounds are analyzed.
      PubDate: 2022-09-01
      DOI: 10.1134/S2070050422030047
       
  • Silver Catalysts for the Partial Oxidation of Alcohols

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      Abstract: The review presents an analysis of the current state in the field of partial oxidation of alcohols to carbonyl compounds on Ag catalysts, including the partial oxidation of methanol to formaldehyde, oxidation of ethylene glycol to glyoxal, and oxidation of ethanol to acetaldehyde. For methanol oxidation, conditions for BASF and ICI processes were considered, and the whole chain of transformations from natural gas to formaldehyde was evaluated from the viewpoint of exergy. Recent publications on the kinetics of partial oxidations of alcohols on silver were analyzed, including those that considered the use of a ring-shaped reactor to suppress the homogeneous decomposition stages of formaldehyde, the development of a new approach to process modeling taking into account different degrees of catalyst reactivity, and the creation of a simulator for calculating methanol oxidation based on a neural network using a genetic algorithm. The main stages of process development of partial oxidation of ethylene glycol to glyoxal on Ag catalysts are briefly described. Recent experimental and theoretical studies on the mechanisms of formation of oxygen-containing active sites on the silver surface and their participation in the conversion of alcohols into carbonyl compounds, as well as new Ag-containing catalytic composites, are presented.
      PubDate: 2022-09-01
      DOI: 10.1134/S2070050422030059
       
  • Acid Activation of Montmorillonite as a Way of Controlling Its Catalytic
           Behavior in the Synthesis of Solketal from Glycerol and Acetone

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      Abstract: The effect of acid activation with 0.125–0.5 M Н2SO4, HCl, and HNO3 on the physicochemical properties and catalytic performance of natural clay (the Mukhartalinskii deposit) containing 95% montmorillonite (MM) was investigated in the synthesis of solketal [(2,2-dimethyl 1,3-dioxolan-4-yl)methanol] from glycerol and acetone. The reaction rate and selectivity toward solketal are shown to depend on the type and concentration of acid. Both the yield of solketal and the reaction rate rose with increasing acid concentration, which correlates with the increase in the number of Brønsted acid sites. The efficiency of the system was found to diminish in the order MM/HCl > MM/HNO3 > MM/H2SO4 as the surface acidity decreased.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070050422020040
       
  • Reductive Catalytic Fractionation of Lignocellulosic Biomass: A New
           Promissing Method for Its Complex Processing

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      Abstract: This review focused to the discussion of the results from recent research in a promising area of the complex processing of lignocellulosic biomass: reductive catalytic fractionation (RCF). The effect catalysts, co-catalysts, solvents, sources of hydrogen, and the nature of lignocellulosic raw materials on the selectivity in the production of monomeric lignin products is considered. Heterogeneous catalysts are mainly used in RCF processes, which allows the reductive depolymerization of lignin to obtain low molecular weight compounds while maintaining the carbohydrate components of the biomass. Of the considered catalysts based on platinum group and transition metals, those containing Pd, Pt, Ru, and Ni have the highest activity. The nature of the metal also affects the composition of the resulting products. For example, ruthenium catalysts produce 4-propyl guaiacol as the main product, while ones based on Ni and Pd yield 4-propanol guaiacol. Catalysts containing Mo, due to their lower hydrogenation activity, give monolignols or their esterified derivatives of while preserving the carbohydrate components of lignocellulosic biomass. However, bifunctional catalysts that contain both acidic and metallic active sites are the most efficient in RCF processes. Acid sites contribute to the breaking of etheric β-O-4 bonds, while metal sites catalyze reduction of the resulting intermediate compounds. An important aspect of selecting suitable catalysts for the RCF process is their reusability. The use of a ferromagnetic catalyst or a basket for the catalyst solves the problem of separating it from products of the process.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070050422020052
       
  • Study of the NIAP-06-06 Zinc–Copper Catalyst for the Steam Reforming of
           Carbon Monoxide in the Synthesis of Methanol

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      Abstract: A study is performed by using a zinc–copper catalyst for the steam reforming of CO NIAP-06-06 in the synthesis of methanol. The catalyst is characterized via the TPV of N2, XRF, and SEM. It is tested in the synthesis of methanol in flow and circulation modes at a pressure of 5.0 MPa, GHSV of 3000 h−1, and the 220–260°C range of temperatures. It is shown that the catalyst has high activity and selectivity in synthesizing methanol from gas obtained in the ratio H2 : CO = 3.9 via the steam reforming of methane. Using a series of tubular catalytic reactors in the technological mode of a flow circle allows more than 70% of the CO to be processed and raw methanol to be obtained with a concentration of 95%. The performance of the catalyst for methanol is 427.7 kg/( \({\text{m}}_{{{\text{cat}}}}^{3}\) h) in the circulation mode.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070050422020064
       
  • Impregnating Noble Metals into the Polymer Matrix of Super Cross-Linked
           Polystyrene

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      Abstract: Commercial super cross-linked polystyrene (SPS) is a promising support for creating heterogeneous catalysts designed for processes of fine organic synthesis. Results from years of studying the creation of heterogeneous Pd-, Pt-, and Ru-containing catalysts based on SPS of grades MN100 and MN270. Data are presented from characterizing SPS and catalysts based on them using a complex of physical and physicochemical means of analysis. It is shown that commercial SPS can be used to synthesize catalysts in the form of spherical grains or preliminarily ground powders. Along with the nature of a metal catalyst precursor, the form of an SPS has a strong effect on the distribution of Pd, Pt, and Ru compounds and the size of metal-containing nanoparticles formed in the polymer’s medium. The catalysts in a hydrogen flow at a temperature of 300°C on the surface chemical composition of powder MN100 samples impregnated w Pd, Pt, and Ru compounds is considered for the first time.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070050422020027
       
  • Syntheis of Liquid Fuel Products by the Catalytic Hydroliquefaction of
           Sapropels Using Nickel and Nickel–Tungsten Catalysts

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      Abstract: Ni-containing catalysts are obtained on the basis of carbon mineral supports produced using sapropel and studied during the catalytic hydroliquefaction of sapropel. It is found that catalysts on supports obtained from mineral-type sapropel are more active than ones on supports based on organic-type sapropel, while bimetallic NiW catalysts exhibit higher activity than monometallic nickel catalysts, regardless of the nature of the support. It is shown that both the nature of the deposited metal and the support composition affect the conversion of the organic matter of sapropel and the composition of liquid products. The liquid products of hydroliquefaction contain mainly nitrogen- and oxygen-containing compounds. The maximum yield of hydrocarbons C5–C21 is obtained for catalysts on supports obtained from mineral-type sapropel. Liquid products of hydroliquefaction of sapropels are similar in composition to biofuels from other renewable raw materials and can be included in existing schemes for further processing.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070050422020106
       
 
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