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  Subjects -> MATHEMATICS (Total: 879 journals)
    - APPLIED MATHEMATICS (71 journals)
    - GEOMETRY AND TOPOLOGY (19 journals)
    - MATHEMATICS (651 journals)
    - MATHEMATICS (GENERAL) (42 journals)
    - NUMERICAL ANALYSIS (19 journals)
    - PROBABILITIES AND MATH STATISTICS (77 journals)

MATHEMATICS (651 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 3)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 8)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
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: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 1)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 1)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Mathematical Physics     Open Access   (Followers: 5)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 5)
Advances in Pure Mathematics     Open Access   (Followers: 4)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 7)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 3)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 10)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 3)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 5)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 7)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, 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: 8)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription  
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
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  
Annuaire du Collège de France     Open Access   (Followers: 5)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 1)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 2)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 19)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Journal of Current Engineering & Maths     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: 2)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Baltic International Yearbook of Cognition, Logic and Communication     Open Access  
Basin Research     Hybrid Journal   (Followers: 4)
BIBECHANA     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
BoEM - Boletim online de Educação Matemática     Open Access  
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: 1)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 21)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 7)
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: 1)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 18)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
ChemSusChem     Hybrid Journal   (Followers: 7)
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  
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Full-text available via subscription   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 29)
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: 2)
Discrete Mathematics     Hybrid Journal   (Followers: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 3)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Ensino da Matemática em Debate     Open Access  
Entropy     Open Access   (Followers: 5)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 4)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 4)
Expositiones Mathematicae     Hybrid Journal   (Followers: 2)
Facta Universitatis, Series : Mathematics and Informatics     Open Access  
Fasciculi Mathematici     Open Access  
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 4)
Fixed Point Theory and Applications     Open Access   (Followers: 1)
Formalized Mathematics     Open Access   (Followers: 2)
Foundations and Trends® in Econometrics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 | Last

Journal Cover Catalysis in Industry
  [SJR: 0.182]   [H-I: 7]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 2070-0555 - ISSN (Online) 2070-0504
   Published by Springer-Verlag Homepage  [2355 journals]
  • Dynamic capacity of desiccants based on modified alumina at elevated
           pressures
    • Authors: R. A. Zotov; L. A. Isupova; V. V. Danilevich; A. A. Babina; A. N. Sinel’nikov; E. P. Meshcheryakov; I. A. Kurzina
      Pages: 91 - 98
      Abstract: Alumina desiccants obtained by extrusion molding of plastic pastes based on pseudoboehmite or bayerite-containing hydroxides including those modified by sodium and potassium ions were studied. The hydroxides were synthesized by hydration of the product of centrifugal thermal activation of gibbsite under mild conditions. The physicochemical and structural-mechanical properties of the desiccants (fresh and after nine adsorption–regeneration cycles) were studied. The dynamic capacity was determined at a pressure of 3MPa under conditions designed to model the industrial conditions. The sample obtained from bayeritecontaining hydroxide had a higher dynamic capacity than the sample obtained from pseudoboehmite-containing hydroxide at close texture and strength characteristics of adsorbents. Modification of the samples obtained from pseudoboehmite-containing hydroxide with potassium and sodium ions leads to decreased granule stability and increased volume, average pore size, and dynamic capacity. The potassium-modified sample of the desiccant had dynamic capacity as high as that of the sample obtained from bayerite-containing hydroxide at low load. After the cyclic tests, the phase composition, alkaline impurity contents, specific surface area, and crushing strength of the samples did not change within the error of determination. It was found that the prepared desiccants were highly stable in many adsorption–desorption cycles and the minimum dew point of –80°C could be reached during the drying.
      PubDate: 2017-04-01
      DOI: 10.1134/s207005041702012x
      Issue No: Vol. 9, No. 2 (2017)
       
  • Bimetallic Pd–Cu/ZnO–Al 2 O 3 and Pd–Cu/ZrO 2 –Al 2 O 3 catalysts
           for methanol synthesis
    • Authors: Pawel Mierczynski; Radoslaw Ciesielski; Adam Kedziora; Waldemar Maniukiewicz; Tomasz P. Maniecki
      Pages: 99 - 103
      Abstract: Monometallic copper and bimetallic palladium-copper catalysts supported on ZnO–Al2O3 and ZrO2–Al2O3 were prepared by conventional impregnation method and tested in methanol synthesis reaction under elevated pressure (3.5 MPa) in gradientless reactor at 220°C. The physicochemical properties of prepared catalytic systems were studied using BET, X-ray, TPR-H2, TPD-NH3 techniques. The promotion effect of palladium on catalytic activity and selectivity of copper supported catalyst in methanol synthesis reaction was proven. The highest activity of this system is explained by the Pd–Cu alloy formation.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020052
      Issue No: Vol. 9, No. 2 (2017)
       
  • Kinetics of low-temperature steam reforming of propane in a methane excess
           on a Ni-based catalyst
    • Authors: S. I. Uskov; L. V. Enikeeva; D. I. Potemkin; V. D. Belyaev; P. V. Snytnikov; I. M. Gubaidullin; V. A. Kirillov; V. A. Sobyanin
      Pages: 104 - 109
      Abstract: Systematic studies were performed on low-temperature steam conversion or low-temperature steam reforming (LTSR) of propane in an excess of methane on a Ni-based catalyst. The LTSR of the methane–propane mixture is a two-stage process involving the irreversible steam conversion of propane into carbon dioxide and hydrogen and reversible methanation of carbon dioxide. Above ~250°C, the methanation of carbon dioxide is quasi-equilibrium. The rate of propane conversion during the LTSR of the methane–propane mixture is first-order based on propane; its activation energy is ~120 kJ/mol and is almost independent of the methane, carbon dioxide, hydrogen, and steam concentrations. This very simple macrokinetic scheme allows us to correctly describe the experimental data and predict the temperature and flow rate of the mixture at which complete conversion of propane is achieved.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020118
      Issue No: Vol. 9, No. 2 (2017)
       
  • Carbon-containing catalysts for the hydroprocessing of oil fractions: A
           review
    • Authors: E. N. Terekhova; O. N. Baklanova; A. V. Lavrenov
      Pages: 110 - 121
      Abstract: Over the last 20 years, carbon-containing catalysts prepared using carbonized aluminum oxide and various carbon-based materials as carriers, along with metal carbides as active components, have been widely studied in the hydroprocessing of oil fractions. In this work, the properties of different groups of carbon-containing catalysts are discussed. The difficulties of using carbon-based carriers caused by their need for chemical pretreatment (oxidation and leaching), and the application of water–organic infiltrating solutions to form active catalyst components in finely dispersed form, is shown.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020106
      Issue No: Vol. 9, No. 2 (2017)
       
  • Improving the yield and quality of reformate via combined application of
           staged reforming and hydroisomerization
    • Authors: D. O. Kondrashev
      Pages: 122 - 127
      Abstract: Three process flowsheets combining the processes of catalytic reforming, interstage separation, and reformate hydroisomerization are considered to improve the yield and quality of reformate (i.e., reduce the content of aromatics, including benzene). It is shown that the process flowsheet with the distillation of the intermediate reformate into three fractions (IBP-85°C, 85–150°C, and EBP-150°C) is the best one, since it allows the production of high-octane gasoline compounds with a reduced benzene content (less than 1 wt %) at an appreciable increase in the yield of reformate (up to 4–5 wt %) and its research octane number (RON) (up to 2), in comparison to traditional (fixed-bed) catalytic reforming. Effective catalysts are selected for the reforming and reformate hydroisomerization stages and are used to perform experimental modeling of the considered flowsheets for the combined reforming–hydroisomerization process. The results confirm analytical estimates for the effectiveness of the developed technology.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020039
      Issue No: Vol. 9, No. 2 (2017)
       
  • Studying the efficiency of the diesel fuel isodewaxing process on a
           zeolite-containing nickel–molybdenum catalyst
    • Authors: D. O. Kondrashev; A. V. Kleimenov; L. A. Gulyaeva; V. A. Khavkin; L. A. Krasil’nikova; A. I. Grudanova; D. V. Khrapov; A. V. Panov
      Pages: 128 - 135
      Abstract: A GIP-14 diesel fuel isodewaxing catalyst based on a mixture of zeolites with different pore structures and entrance sizes and transition metals Ni and Mo as hydrogenating components is developed. Its stability during operation is studied. It is shown that the cold filter plugging point (CFPP) of the diesel fuel reaches values below–38°C at its yield of 92–93 wt %, temperatures of 305–310°C, and a feedstock hourly space velocity (FHSV) of 3 h−1. A pilot diesel fuel sample is tested according to GOST (Russian State Standard) R 55475–2013. Comparative tests of domestic and foreign catalysts show that the developed GIP-14 catalyst conforms to international standards and allows the production of diesel fuel with required cold flow properties under milder conditions (300°C against 320–325°C for the foreign catalyst) at a higher FHSV (3 h−1 against 2 h−1). The production of GIP-14 catalyst is planned to be launched in 2017.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020040
      Issue No: Vol. 9, No. 2 (2017)
       
  • Reactivation of an industrial batch of CoMo/Al 2 O 3 catalyst for the deep
           hydrotreatment of oil fractions
    • Authors: S. V. Budukva; O. V. Klimov; A. S. Noskov; V. A. Golovachev; D. O. Kondrashev; A. V. Kleimenov; R. V. Esipenko; A. P. Kubarev; D. V. Khrapov
      Pages: 136 - 145
      Abstract: The results from industrial tests of technology developed earlier for the reactivation of CoMo/Al2O3 catalyst for the deep hydrotreating of diesel fuel, including the oxidative regeneration of the catalyst with subsequent treatment using organic complexing agents, are presented. Samples of the catalyst, fresh and at different stages of its reactivation, are investigated using a set of analytical and physicochemical methods. The chemical composition, textural characteristics, mechanical strength, structure of the active sulfide component (TEM, XPS) are determined. Catalytic tests are performed that include lifetime tests (360 h) in the hydrotreatment of a straight-run diesel fraction. The restoration of the physicochemical and catalytic properties is observed for a sample subjected to oxidative regeneration with subsequent treatment using organic complexing agents. An industrial batch of deep hydrotreatment catalyst reactivated by this technology is loaded into an L-24-6 industrial plant facility and ensures stable purification of straight-run diesel fuel containing up to 10% of light catalytic cracking gas oil to a residual sulfur content of less than 10 ppm. Comparison of the obtained results and data on the industrial operation of fresh catalysts shows that the technology developed by the Institute of Catalysis and PAO Gazprom Neft ensures almost complete restoration of the properties of the deactivated catalysts.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020027
      Issue No: Vol. 9, No. 2 (2017)
       
  • Inhibiting HDS and HYD reactions with quinoline on Co(Ni)–PMo(W)/Al 2 O
           3 catalysts: Effect of active phase composition on stability in the
           hydrotreatment of a model petroleum raw material
    • Authors: P. P. Minaev; A. S. Koklyukhin; K. I. Maslakov; P. A. Nikulshin
      Pages: 146 - 155
      Abstract: Со(Ni)–PMo(W)/Al2O3 catalysts are prepared using Keggin heteropoly acids H3PMo(W)12O40 and cobalt (nickel) citrate. The physicochemical properties of the catalysts are studied via low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. Their catalytic properties are determined in the hydrotreatment of a model raw material containing dibenzothiophene, naphthalene, and different amounts of quinoline (up to 1000 ppm of nitrogen), and in the hydrotreatment of a straight-run diesel fraction and vacuum gas oil. The composition of Со(Ni)–PMo(W)/Al2O3 catalysts plays an important role in the hydrotreatment of a complex hydrocarbon raw material. Ni–PW/Al2O3 catalyst is more resistant to organonitrogen inhibitors than Ni(Co)–PMo/Al2O3 samples with more reactive active sites. Ni–PW/Al2O3 catalyst provides the greatest depth of conversion for sulfur- and nitrogen-containing compounds and polycyclic aromatic hydrocarbons in the hydrotreatment of vacuum gas oil.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020064
      Issue No: Vol. 9, No. 2 (2017)
       
  • Features of catalysts for the hydrogenless refining of low-grade gasoline
           fractions
    • Authors: O. V. Potapenko; V. P. Doronin; T. P. Sorokina; M. A. Plekhanov; N. V. Korotkova; A. V. Kleymenov
      Pages: 156 - 161
      Abstract: A refining process without the use of molecular hydrogen or zeolite-containing catalyst for lowgrade gasoline fractions is developed at the Institute of the Petroleum and Petrochemical Industry, Siberian Branch, Russian Academy of Sciences, and AO Gazpromneft-ONPZ. The processing of a mixture of coking gasoline and straight-run gasoline fraction of 62–85° reduces the content of unsaturated compounds by 90–95 wt % and that of sulfur compounds by 95–99 wt %, while improving the octane characteristics of the gasoline product by 3–5 points. The catalyst is based on the ultra-stable Y-type zeolite produced in HREE-form by AO Gazpromneft-ONPZ. This technology is unique and has no analogs.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020076
      Issue No: Vol. 9, No. 2 (2017)
       
  • New mixed perovskite-type Gd 2–x Sr 1+x Fe 2 O 7 catalysts for dry
           reforming of methane, and production of light olefins
    • Authors: T. F. Sheshko; T. A. Kryuchkova; Yu. M. Serov; I. V. Chislova; I. A. Zvereva
      Pages: 162 - 169
      Abstract: The catalytic properties of complex perovskite-type gadolinium and strontium oxides in carbon dioxide reforming of methane and the production of gaseous olefins by carbon monoxide hydrogenation have been studied. Samples of Gd2SrFe2O7 and Gd2–x Sr1+x Fe2O7 (х = 0.1; 0.2; 0.3; and 0.4) have been obtained by the sol–gel method and ceramic technology, and have been characterized by means of X-ray diffraction, scanning electron microscopy, photon correlation spectroscopy, Mössbauer spectroscopy, and N2 adsorption–desorption analysis. It has been shown that the sol–gel method allows us to produce samples with better catalytic characteristics than ceramic systems. The nonisovalent substitution of Gd3+ for Sr2+ distorts the structure of complex oxide, resulting in the emergence of the heterovalent state of iron atoms (Fe3+ and Fe4+) reflected in the values of reactant conversion and selectivity for the target products. A sample of Gd2–x Sr1+x Fe2O7 with х = 0.3 displays the highest catalytic activity in dry reforming of methane reforming, along with the highest selectivity for unsaturated hydrocarbons (ethylene and propylene) in hydrogenation of carbon monoxide.
      PubDate: 2017-04-01
      DOI: 10.1134/s207005041702009x
      Issue No: Vol. 9, No. 2 (2017)
       
  • Studying the thermal conversion of acetone lignin in supercritical butanol
           in the presence of NiCuMo/SiO 2 catalysts
    • Authors: V. I. Sharypov; B. N. Kusnetsov; V. A. Yakovlev; N. G. Beregovtsova; S. V. Baryshnikov
      Pages: 170 - 179
      Abstract: Existing and emerging technologies for the chemical processing of wood are mainly aimed at transforming its cellulose component into target products. In these processes, lignin is produced on a large scale as a waste product, but there are no advanced ways of processing it. This work investigates the effect NiCuМо/SiO2 catalysts have on the thermal transformation of acetone lignin in supercritical butanol at temperatures of 280, 300, and 350°C. The resulting liquid products are studied via gas–liquid chromatography mass spectrometry, and 13С NMR spectroscopy. It is found that butanol undergoes almost no thermochemical conversions at temperatures below 300°C. Catalysts raise its level of conversion to 36–40 wt %. Under the effect of NiCuМо/SiO2 catalysts, the yield of hexane-soluble products of acetone lignin thermal conversion at 300°C increases by a factor of 2.4, while the yield of solid residue falls by approximately a factor of 3.3. Catalysts reduce the relative content of methoxyphenols in hexane-soluble products: the content of syringol in particular falls by a factor of 14. According to 13С NMR spectroscopy, the catalytic transformation of acetone lignin to liquid acetone-soluble products is accompanied by the breaking of β–О–4 chemical bonds between the structural fragments of lignin and a reduction in the content of methoxyl groups, primarily in the syringyl structural units of the resulting products.
      PubDate: 2017-04-01
      DOI: 10.1134/s2070050417020088
      Issue No: Vol. 9, No. 2 (2017)
       
  • Modern hydroprocesses for the synthesis of high-quality low-viscous marine
           fuels
    • Authors: N. K. Kondrasheva; D. O. Kondrashev
      Pages: 1 - 9
      Abstract: Basic physicochemical and service properties inherent in middle distillate fractions from hydrocatalytic and thermodestructive processes are studied for one Russian refinery from the viewpoint of using them as potential components for low-viscous marine fuels (LMFs) with improved environmental and low-temperature properties. A laboratory-scale flow-through setup loaded with an industrial nickel–molybdenum catalyst is used for the hydrocracking of vacuum gasoils (with T ebp ranging from 500 to 580°C) at 340–380°C and 15.0 MPa. The highest yield of the light hydrocracking gasoil (LHCG) is observed upon the processing of vacuum gasoil (T ebp, 350–500°C) at 360°C, the highest cetane index (53 points) and the lowest sulfur content (7 ppm) being characteristic of the obtained LHCG. With heavier vacuum gasoil, the total yields of target distillates and the yield of LHCG decrease. In terms of physicochemical and service properties, the obtained LHGC is a high-quality component of LMFs. Comparative properties of the hydrorefined virgin diesel fraction, light gasoils obtained via catalytic cracking, slow coking, and the promising hydrocracking process are analyzed. The physicochemical, environmental, and main service properties inherent in the middle distillate fractions of secondary processes are determined depending on their hydrocarbon and nonhydrocarbon compositions, and on the content of key components. Based on these dependences, recommendations are made for the production of optimum low-viscous marine fuels with improved environmental and low-temperature properties.
      PubDate: 2017-01-01
      DOI: 10.1134/s207005041701007x
      Issue No: Vol. 9, No. 1 (2017)
       
  • Modeling the reforming of straight-run gasoline (fraction 85–140°C)
           with allowance for the deactivation of Pt catalyst
    • Authors: A. A. Dyusembaeva; V. I. Vershinin
      Pages: 10 - 16
      Abstract: A kinetic model of reforming is developed that describes the chemical transformations of С6–С8 pseudocomponents over Pt catalyst. The composition of platformate is predicted in light of the activity of the metal and acid sites, and temperature profile in the reactors. Equations of mass and heat balance are used in the calculations. The rate constants and activation energies of individual reactions are determined for catalyst of the R-134 series. The stationary activity values (a s = 0.8) are calculated along with the constants of the deactivation of acid (0.0056 ± 0.0004 min−1) and metal (0.079 ± 0.003 min−1) sites at Т = 490°C. The relative error of platformate composition modeling for benzene, toluene, and xylenes does not exceed 5%. It is shown that the stability of platformate composition is due to a stepwise temperature increase in the reactors during the periods between regenerations. It is proposed that the developed model be used to select temperature regimes for the operation of aromatic-producing industrial complexes in order to obtain platformate of desired compositions.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010056
      Issue No: Vol. 9, No. 1 (2017)
       
  • Pilot tests of the microspherical aluminochromium KDI-M catalyst for iso
           -butane dehydrogenation
    • Authors: A. A. Lamberov; S. R. Egorova; Kh. Kh. Gilmanov; A. N. Kataev; G. E. Bekmukhamedov
      Pages: 17 - 22
      Abstract: Results from pilot tests of microspherical aluminochromium KDI-M catalyst mixed with IM-2201 in a large-scale unit (Nizhnekamskneftekhim) for iso-butane dehydrogenation are discussed. Compared to KDI catalyst, its modified analogue KDI-M is more active and selective; the optimized grain-size composition and mechanical strength ensures higher yields of iso-butylene and longer nonstop operation (up to 400 days) of the reactor unit.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010093
      Issue No: Vol. 9, No. 1 (2017)
       
  • A microfiber catalyst with lemniscate structural elements
    • Authors: S. A. Lopatin; P. E. Mikenin; D. A. Pisarev; S. V. Zazhigalov; D. V. Baranov; A. N. Zagoruiko
      Pages: 39 - 47
      Abstract: A new type of catalyst based on microfiber supports with microfibers twined into looped threads (lemniscate) that in turn form a structured flexible stable and geometrically regular bulk bed permeable to a reaction flow and not requiring any additional structurial elements is described. Deep toluene oxidation experiments show that the proposed platinum lemniscate glass-fiber catalyst (LGFC) considerably surpasses (by 8–10 times and more) familiar geometric types of catalysts, microfiber and otherwise, in both the specific observed activity per unit active component mass and the ratio between the observed activity and the specific hydraulic resistance. The reason for its superiority is a uniquely high efficiency of mass transfer in the external diffusion region of reactions. Among the promising fields of application for the proposed systems are fast gasphase catalytic reactions, liquid-phase catalytic reactions, and complicated reaction processes, in which the selectivity and the yield of target products are sensitive to diffusion inhibition.
      PubDate: 2017-01-01
      DOI: 10.1134/s207005041701010x
      Issue No: Vol. 9, No. 1 (2017)
       
  • Preparing and studying Pt/WO 3 /ZrO 2 catalysts for the isomerization of n
           -heptane
    • Authors: M. D. Smolikov; V. A. Shkurenok; S. S. Yablokova; D. I. Kir’yanov; E. A. Paukshtis; N. N. Leont’eva; A. S. Belyi; V. A. Drozdov
      Pages: 54 - 61
      Abstract: The effect of the temperature of WO3/ZrO2 support calcination in the range of 700–1000°C on the phase composition, acid, and catalytic properties of Pt/WO3/ZrO2 catalysts is studied. Using ammonia TPD, it is found that calcination in the temperature range of 850–950°C results in the formation of strong acid sites that increase the yield of the target products of the reaction of n-heptane isomerization: high octane di- and trimethylsubstituted isomers. DRIFT is used to determine the role of catalyst calcination in an air flow plays in the formation of charged platinum atoms, which results in higher catalyst activity.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010135
      Issue No: Vol. 9, No. 1 (2017)
       
  • Enzymatic interesterification of sunflower oil and hydrogenated soybean
           oil with the immobilized bacterial recombinant lipase from Geobacillus
           stearothermophilus G3
    • Authors: Y. V. Samoylova; A. V. Piligaev; K. N. Sorokina; V. N. Parmon
      Pages: 62 - 70
      Abstract: In this study we discuss the properties of biocatalyst based on Geobacillus stearothermophilus G3 lipase immobilized on silica gel. Interesterification of sunflower oil and hydrogenated soybean oil (HSO) in a batch reaction was completed within 2 h, 10% biocatalyst (wt %), 70°С, and HSO: sunflower oil molar ratio of 1: 3. The physical and chemical parameters of reaction products were studied by HPLC-MS to access the composition of triacylglycerides and by slip melting point method. Biocatalyst has shown high operational stability. The estimated time of its operation in the oil mixture was 243 h that makes this catalyst promising for application in manufacturing of modified fats, including fats with high melting temperatures.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010123
      Issue No: Vol. 9, No. 1 (2017)
       
  • Improving the efficiency of the bioconversion of plant raw materials with
           mutant cellulases of Penicillium verruculosum
    • Authors: A. S. Dotsenko; A. M. Rozhkova; A. V. Gusakov; A. P. Sinitsyn
      Pages: 71 - 76
      Abstract: Plant biomass is the main type of organic material on Earth. The efficiency of biocatalytic conversion of plant raw materials determines the cost of their biotechnological processing to produce commercially valuable products such as organic alcohols and acids, carbohydrates, and hydrocarbons. New recombinant Penicillium canescens strains that produce not only their own enzyme complex but also heterologous cellulases (i.e., mutant and wild-type cellobiohydrolase I (CBH I) and endoglucanase II (EG II) of P. verruculosum) are constructed. Enzymatic agents (EAs) prepared on the basis of recombinant strains of P. canescens are found to be more active in the hydrolysis of crushed aspen wood. Yields of glucose and reducing sugars are observed 24–72 h after hydrolysis with EAs prepared in recombinant strains to be from 48 to 52 and 60 to 64%, respectively, higher than those for hydrolysis with EAs prepared in the initial recipient strain. The presence of N45A and N194A site-specific mutations introduced to reduce surface glycosilation thus results in a substantial increase in the yields of desired CBH I and EG II.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010044
      Issue No: Vol. 9, No. 1 (2017)
       
  • Effect of the milling of wheat bran on its properties and reactivity
           during biocatalytic conversion
    • Authors: D. O. Osipov; A. G. Bulakhov; O. G. Korotkova; A. M. Rozhkova; E. O. Duplyakin; A. V. Afonin; A. S. Sereda; A. P. Sinitsyn
      Pages: 77 - 84
      Abstract: The possibility of using wheat bran as a feedstock for sugar production via biocatalytic conversion is demonstrated. The relatively low reactivity of this feedstock can be doubled or quadrupled by dry milling on an AGO-2S planetary mill activator. The maximum yield of reducing sugars, 68.6 g/L (initial substrate concentration, 100 g/L; glucose is the major component of the resulting sugars, 93–95%), is achieved when wheat bran milled for 7–10 min is subjected to bicatalytic conversion using the complex enzyme preparation (EP) of Penicillium verruculosum gaBG with cellulolytic, hemicellulolytic, and amylolytic activity at a gaBG dose of 60 mg/g (supplemented with F10 β-glucosidase EP, 40 units/g). Polysaccharides comprise 62.4% of the dry weight of the wheat bran; allowing for the water incorporated during enzymatic hydrolysis, the achieved yield is close to the theoretical figure (68.6 g/L) and there is virtually complete conversion of the wheat bran carbohydrates. Lengthening the duration of milling to 7–10 min considerably reduces the size of bran particles, lowers (by 28%) their ability to bind water, nearly doubles the content of water-soluble sugar, and increases (by 12.6%) the total content of soluble components, relative to the initial material.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010111
      Issue No: Vol. 9, No. 1 (2017)
       
  • Enzymatic synthesis of butyrates of fusel oil
    • Authors: V. S. Gamayurova; K. L. Shnaider; M. J. Jamai
      Pages: 85 - 90
      Abstract: Many esters derived from lower aliphatic acids and alcohols have pleasant fruity aromas. These compounds are common in the plant kingdom. Some are chemically synthesized and used as fragrances. In this work, fruity flavored butyric esters are produced using lipase agents. The substrate is an alcohol-containing fraction obtained by distilling fusel oil, a waste product of the alcohol industry (T b = 120–140°С). The yield of the target products in the presence of pancreatic lipase and the lipase from the Candida rugosa yeast is ~94.0% under the determined optimum conditions.
      PubDate: 2017-01-01
      DOI: 10.1134/s2070050417010068
      Issue No: Vol. 9, No. 1 (2017)
       
 
 
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