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  Subjects -> COMPUTER SCIENCE (Total: 1991 journals)
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COMPUTER SCIENCE (1157 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 13)
Abakós     Open Access   (Followers: 4)
ACM Computing Surveys     Hybrid Journal   (Followers: 22)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 9)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 13)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 6)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 12)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 13)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 4)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 1)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 20)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 8)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 11)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 25)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Advanced Engineering Materials     Hybrid Journal   (Followers: 26)
Advanced Science Letters     Full-text available via subscription   (Followers: 8)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 16)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Computer Science : an International Journal     Open Access   (Followers: 14)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 51)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Human-Computer Interaction     Open Access   (Followers: 20)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 38)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access   (Followers: 2)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 8)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Air, Soil & Water Research     Open Access   (Followers: 9)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 7)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 7)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annual Reviews in Control     Hybrid Journal   (Followers: 6)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 2)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 14)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Computer Systems     Open Access   (Followers: 1)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 33)
Applied Medical Informatics     Open Access   (Followers: 11)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 131)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 6)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access   (Followers: 1)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 4)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 11)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Bioinformatics     Hybrid Journal   (Followers: 305)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 44)
British Journal of Educational Technology     Hybrid Journal   (Followers: 128)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 2)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
Cell Communication and Signaling     Open Access   (Followers: 1)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access  
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 7)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 12)
Circuits and Systems     Open Access   (Followers: 16)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 20)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 53)
Communications of the Association for Information Systems     Open Access   (Followers: 18)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access  
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Computación y Sistemas     Open Access  
Computation     Open Access  
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 and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 9)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 14)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 13)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 31)
Computer     Full-text available via subscription   (Followers: 87)
Computer Aided Surgery     Hybrid Journal   (Followers: 3)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 7)
Computer Communications     Hybrid Journal   (Followers: 10)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 7)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 22)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 10)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 1)
Computer Music Journal     Hybrid Journal   (Followers: 16)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Computer Science - Research and Development     Hybrid Journal   (Followers: 7)
Computer Science and Engineering     Open Access   (Followers: 17)
Computer Science and Information Technology     Open Access   (Followers: 11)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computer Science Journal     Open Access   (Followers: 20)
Computer Science Master Research     Open Access   (Followers: 10)
Computer Science Review     Hybrid Journal   (Followers: 10)

        1 2 3 4 5 6 | 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  [2352 journals]
  • Pyrolysis of methane on oxide catalysts supported by resistive fechral and
           carborundum
    • Authors: S. S. Sigaeva; V. L. Temerev; N. V. Kuznetsova; P. G. Tsyrul’nikov
      Pages: 181 - 188
      Abstract: Catalysts on resistive supports, namely, on the thermally stable metal alloy fechral (FeCrAl) and carborundum (silicon carbide SiC) were studied in the pyrolysis of methane into acetylene. The active components chosen for deposition on carborundum were oxides corresponding to those present on the surface of the heat-treated fechral alloy: iron, chromium, and aluminum oxides, as well as zirconium and silicon oxides. The deposition of oxides on carborundum leads to an increase in methane conversion compared to the starting carborundum. The maximum acetylene selectivity was obtained using the ZrO2/SiC and Al2O3/SiC catalysts. In contrast, the deposition of the same oxides on fechral leads to a decrease in the activity and acetylene selectivity compared with those of the starting heat-treated fechral. On the other hand, the deposition of oxides on fechral results in an increase in the temperature range of the catalyst operation and its stability over time. In the case of carborundum, the deposition of oxides does not affect these characteristics. The study of the starting supports fechral and carborundum and supports with metal oxides showed that high acetylene selectivity correlates with the formation of carbon fibers on the catalyst surface. These fibers mainly form on the surface of alumina, zirconia, and silica.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030114
      Issue No: Vol. 9, No. 3 (2017)
       
  • Kinetics of vapor-phase dehydration of glycerol into acrolein on the BAO-1
           heterogeneous catalyst
    • Authors: S. M. Danov; A. L. Esipovich; A. S. Belousov; A. E. Rogozhin; E. A. Kanakov
      Pages: 189 - 197
      Abstract: The vapor-phase dehydration of glycerol on the heterogeneous catalyst 0.5B2O3/γ-Al2O3 (BAO-1) was studied. The kinetic model of the process was developed based on the data obtained in a differential reactor. To evaluate the kinetic constants of the generalized mathematical models of the kinetics of vapor-phase dehydration of glycerol, we used the differential evolution method implemented in the Mathematica 5.0 program. The calculated activation energy of the target reaction of acrolein formation was 50.18 ± 0.11 kJ/mol. The adequacy of the obtained equations was assessed using the Fisher test. The optimum conditions of the vaporphase dehydration of glycerol were determined using the proposed kinetic equations (reaction temperature 330°C, glycerol concentration in the supply stream 30%, and catalyst load 0.0338 L/(gcat min). The obtained data may be used in calculations for large units for acrolein production by glycerol dehydration.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030047
      Issue No: Vol. 9, No. 3 (2017)
       
  • A new alkylate production process
    • Authors: S. N. Khadzhiev; I. M. Gerzeliev; O. S. Vedernikov; A. V. Kleymenov; D. O. Kondrashev; N. V. Oknina; S. E. Kuznetsov; Z. A. Saitov; M. N. Baskhanova
      Pages: 198 - 203
      Abstract: A new technology for alkylation on solid AlkiRAN-GPN catalyst with process performance characteristics and an attained material balance competitive with existing sulfuric and hydrofluoric acid alkylation technologies is presented. Data on the effect such parameters as temperature, pressure, iso-butane: olefin ratio, and feedstock hourly space velocity (FHSV)) have on the process’s performance characteristics are given, and their optimum values are recommended. It is shown that using a sectioned reactor at a constant inlet iso-butane: olefin ratio ensures a higher internal ratio of these components and an increase in the total concentration of alkylate in the reaction products at a specified internal iso-butane: olefin ratio. This also lengthens the period of catalyst interregeneration with no losses in the process’s productivity and selectivity. The use of a zeolite based on faujasite in the rare-earth element–calcium form (REECaHY) and ultrastable zeolites as catalysts is substantiated. Higher values of olefin conversion and the alkyl gasoline yield are observed when these zeolites are used. To test the new technology, a demonstration plant of iso-butane alkylation with olefins on heterogeneous catalysts with an alkylate production capacity of 1 t/day is constructed. The results from studies are to be used in developing the basic design of an industrial plant. The construction of the first industrial plant of alkylation on a heterogeneous catalyst with an alkyl gasoline production capacity of 100000 t/year is planned at AO Gazprom Neft Moscow Oil Refinery.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030059
      Issue No: Vol. 9, No. 3 (2017)
       
  • New methods for the preparation of high-octane components from catalytic
           cracking olefins
    • Authors: A. S. Kharitonov; D. P. Ivanov; M. V. Parfenov; L. V. Piryutko; S. V. Semikolenov; K. A. Dubkov; V. Yu. Pereima; A. S. Noskov; D. O. Kondrashev; A. V. Kleymenov; O. S. Vedernikov; S. E. Kuznetsov; V. V. Galkin; P. A. Abrashenkov
      Pages: 204 - 211
      Abstract: A new method has been suggested for the preparation of high-octane components from the butane–butylene fraction (BBF) in two stages. At the first stage, the BBF olefins are oxidized with N2O into carbonyl compounds with high selectivity without forming the products of deep oxidation and water. The process occurs in the gas phase in a flow reactor without using a catalyst at a temperature of 400°C and a pressure of 2 MPa with high conversion of both olefins and nitrous oxide. The blending octane number of the oxidation product is 118–133 (RON) and 99–104 (MON). At the second stage, the mixture of carbonyl compounds is hydrogenated with hydrogen in the presence of the Ni/Al2O3 catalyst. The hydrogenation occurs at 150–160°C in a flow reactor in the gas phase. The aldehydes are completely transformed into alcohols, while the ketones can remain in the product under certain conditions. The blending octane number of the hydrogenation product is 111–112 (RON) and 95–96 (MON), which is smaller than for the BBF oxidation product, but larger than for the alkylate obtained in the course of conventional butene alkylation with isobutane (RON is 95–97 and MON is 93–95). Synthesis of high-octane components by this procedure can be useful in practice, especially in productions with huge release of nitrous oxide.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030060
      Issue No: Vol. 9, No. 3 (2017)
       
  • Hydroprocessing of straight run diesel mixed with light cycle oil from
           fluid catalytic cracking, using sulfide NiMo catalyst on
           zeolite-containing supports
    • Authors: G. A. Bukhtiyarova; E. N. Vlasova; P. V. Aleksandrov; A. V. Toktarev; Yu. V. Patrushev; A. S. Noskov; D. O. Kondrashev; V. A. Golovachev; A. V. Kleymenov; P. A. Abrashenkov; S. E. Kuznetsov; V. V. Galkin
      Pages: 212 - 220
      Abstract: It is proposed that the sulfide NiMo system supported on alumina-SAPO-31 composite (NiMo/Al2O3-SAP catalyst) be used to obtain high-quality diesel fuel from a mixture of straight run diesel (SRGO) and light cycle oil (LCO) produced by fluid catalytic cracking (FCC). It is shown that the use of this catalyst ensures the synthesis of diesel fuel of higher quality upon hydroprocessing a feedstock with 30 wt % LCO, compared to the traditional sulfide NiMo/Al2O3 or CoMo/Al2O3 catalysts. It is found that the content of aliphatic hydrocarbons is raised in the products of hydrotreatment, compared to the initial feedstock. This confirms the ability of NiMo/Al2O3-SAP catalyst to facilitate the reaction of ring opening. Using the proposed catalyst should improve the quality of diesel fuels obtained via the hydroprocessing of LCO-containing feedstock.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030035
      Issue No: Vol. 9, No. 3 (2017)
       
  • Catalytic steam cracking of heavy crude oil with molybdenum and nickel
           nanodispersed catalysts
    • Authors: O. O. Mironenko; G. A. Sosnin; P. M. Eletskii; Yu. K. Gulyaeva; O. A. Bulavchenko; O. A. Stonkus; V. O. Rodina; V. A. Yakovlev
      Pages: 221 - 229
      Abstract: The catalytic steam cracking (CSC) of heavy crude oil with high amount of sulfur (4.3 wt %) and high-boiling fractions (>500°C) is studied using Mo and Ni nanodispersed catalysts under static conditions (in an autoclave) at 425°C. Experiments on thermal cracking, steam cracking, and catalytic cracking without water are performed to compare and identify the features of CSC. The relationship between the composition and properties of liquid and gaseous products and process conditions, the type of catalyst, and water is studied. Using Ni catalyst in CSC raises the H: C ratio (1.69) in liquid products, compared to other types of cracking, but also increases the yield of coke and gaseous products, so the yield of liquid products falls. When Mo catalyst is used in CSC, low-viscosity semi-synthetic oil with a higher H: C ratio (1.70) and the lowest amount of sulfur in liquid products (2.8 wt %) is produced. XRF and HRTEM studies of the catalyst-containing solid residue (coke) show that under CSC conditions, nickel is present in the form of well-crystallized nanoparticles of Ni9S8 15–40 nm in size, while molybdenum exists in two phases: MoO2 and MoS2, the ratio between which depends on the conditions of the transformation of heavy crude oil. The findings indicate that CSC is a promising process for improving heavy crude oil.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030084
      Issue No: Vol. 9, No. 3 (2017)
       
  • Catalyst for selective hydrotreating of catalytic cracking gasoline
           without preliminary fractionation
    • Authors: K. A. Nadeina; V. Yu. Pereima; O. V. Klimov; G. I. Koryakina; A. S. Noskov; D. O. Kondrashev; A. V. Kleymenov; O. S. Vedernikov; S. E. Kuznetsov; V. V. Galkin; P. A. Abrashenkov
      Pages: 230 - 238
      Abstract: A new CoMo catalyst for selective hydrotreating of FCC gasoline has been developed; the catalyst is intended for the production of hydrotreated gasoline with up to 10 ppm of sulfur and with a research octane number decreased by less than 1.0. The new catalyst allows hydrotreating of FCC gasoline without its preliminary separation into the light and heavy fractions. The hydrotreating conditions were as follows: hourly space velocity 2.2 h–1, temperature 270°C, pressure 2.5 MPa, H2/feed = 150 m3/m3. The high degree of hydrodesulfurization at minimum decrease in the octane number is achieved due to the high activity of the developed catalyst in hydrodesulfurization of the sulfur-containing components of the feedstock and conversion of reactive high-octane olefins of FCC gasoline into less reactive derivatives with high octane numbers. The catalyst is a CoMoS phase deposited on a support containing amorphous aluminosilicate and γ-Al2O3. The method for the preparation of the catalyst is adapted to the equipment of Russian plants and feedstocks. The parameters of hydrotreating using this catalyst ensure the hydrotreating of FCC gasoline to a residual sulfur content of less than 10 ppm with minimum redesign of the equipment currently available at Russian refineries.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030096
      Issue No: Vol. 9, No. 3 (2017)
       
  • Development and introduction of a highly efficient catalyst for the
           butane–butylene fraction oligomerization process for the production of a
           high-octane automobile gasoline compound
    • Authors: D. O. Kondrashev; A. V. Andreeva
      Pages: 239 - 246
      Abstract: The main stages in developing a technology for the production of high-silica ZSM-5 zeolite-based catalyst for the butane–butylene fraction (BBF) oligomerization process are described. The application of a new zeolite surface modification procedure allows the attainment of higher selectivity and target product yields (compared to familiar analogs) and the synthesis of more branched (and thus more high-octane) oligomers at lower pressures. The introduction of promoting metal Ga raises the target gasoline fraction yield by 0.9%, compared to the unpromoted catalyst. Comparative pilot tests of industrial (BAK-70U) and the developed (Ga-ZSM-5/Al2O3) BBF oligomerization catalysts are performed under the following conditions: pressure, 1.5 MPa; initial working temperature, 300°C; feedstock hourly space velocity (FHSV), 1.5 mL BBF/(mL cat h). It is shown that using modified ZSM-5 based catalyst results in a gasoline fraction yield 7% higher than with BAK-70U. The higher quality of the oligomerizate obtained on Ga-ZSM-5/Al2O3 is observed throughout the period of tests (191 h): MON is 2 points higher, and the concentration of gums is 50% lower. The results from these studies and tests are used for the development and industrial implementation of a technology for the production of the KOB-1 zeolite oligomerization catalyst: 2.5 t of industrial catalyst has been produced by September of 2016 at the industrial facilities of ZAO Redkino Catalyst Plant. The next important stage in the implementation of the Gazprom Netf innovative development strategy in oil refining is a pilot run of the new oligomerization catalyst in the combined industrial MTBE–oligomerizate production plant of Gazprom Neft Moscow Oil Refinery. The introduction of the KOB-1 catalyst at the Gazprom Neft Oil Refinery will be an important step in improving the efficiency of technologies for the production of high-margin products, especially compounds of commercial automobile gasoline.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030072
      Issue No: Vol. 9, No. 3 (2017)
       
  • Nickel–molybdenum and cobalt–molybdenum sulfide hydrogenation and
           hydrodesulphurization catalysts synthesized in situ from bimetallic
           precursors
    • Authors: N. N. Petrukhina; I. A. Sizova; A. L. Maksimov
      Pages: 247 - 256
      Abstract: Unsupported nickel–molybdenum and cobalt–molybdenum sulfide catalysts are synthesized via the in situ decomposition of water-soluble bimetallic precursors in a hydrocarbon feedstock using nickel–molybdenum and cobalt–molybdenum complexes with citric, oxalic, succinic, glutaric, and tartaric acids as precursors. The sulfide catalysts are characterized by means of transmission electron microscopy and X-ray photoelectron spectroscopy. The catalyst activity in the hydrogenation of bicyclic aromatic hydrocarbons and the hydrodesulfurization of dibenzothiophene is studied. The effect the composition of the precursor solution in the hydrocarbon feedstock emulsion has on the activity of the resulting catalyst is determined. It is shown that the activity reaches high values even after 1 h of reaction. The hydrogenation of mono-, di-, and trimethylnaphthalenes and ethylnaphthalene is studied. The optimum promoter-to-molybdenum ratio (0.25: 1) is found. It is shown that the catalyst activity does not fall during recycling, due to the elimination of the negative effect of water contained in the emulsion, which results in oxidation of the catalyst surface. After the second reaction cycle, the catalyst particles are longer and have a greater number of MoS2 layers than the respective parameters of the catalyst particles after the first cycle. XPS shows that the content of oxygen on the catalyst’s surface falls during recycling, while the fraction of metals in the sulfide environment and the sulfur in the sulfide state grows.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030102
      Issue No: Vol. 9, No. 3 (2017)
       
  • Preparing bioethanol from oat hulls pretreated with a dilute nitric acid:
           Scaling of the production process on a pilot plant
    • Authors: O. V. Baibakova; E. A. Skiba; V. V. Budaeva; G. V. Sakovich
      Pages: 257 - 263
      Abstract: The full cycle of bioethanol production from pretreated oat hulls is scaled for a pilot plant. The one-stage pretreatment of oat hulls with a dilute nitric acid at atmospheric pressure is scaled for a 250-L reactor. The total amount of hydrolysable polysaccharides in the resulting substrate is 87.2%. Using the commercially available enzyme preparations CelloLux-A and BrewZyme BGX and the industrial strain BKPM Y-1693 of Saccharomyces cerevisiae yeast, the process of enzymatic hydrolysis and alcoholic fermentation is successfully scaled for a 63-L reactor. The scaling factor is 1: 400. Bioethanol is obtained with a high yield of 17.9 daL/t. After rectification, the test sample of bioethanol meets the standards for high-purity alcohol from food raw materials according to the mass concentration of aldehydes, esters, and by the content of methanol.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030023
      Issue No: Vol. 9, No. 3 (2017)
       
  • New methods for the one-pot processing of polysaccharide components
           (cellulose and hemicelluloses) of lignocellulose biomass into valuable
           products. Part 2: Biotechnological approaches to the conversion of
           polysaccharides and monosaccharides into the valuable industrial chemicals
           
    • Authors: K. N. Sorokina; Yu. V. Samoylova; A. V. Piligaev; Uthandi Sivakumar; V. N. Parmon
      Pages: 264 - 269
      Abstract: Part 2 of the review discusses modern processes for biotechnological conversion of lignocellulosic biomass into the valuable chemicals. It also recognizes the new approaches toward the development of more efficient enzymes for the depolymerization of biomass and the properties of the microorganisms employed in the fermentation of the biomass-derived sugars. Various biotechnological approaches to the fermentation of the depolymerized biomass products are described, including SHF, SSF, NSSF, SSFF, SSCF, and CBP. It is demonstrated that that the main tendencies for development of the new technologies for biotechnological biomass processing are the application of genetic engineering, synthetic biology and reduction of the number of processing steps. Application of one-pot processing of lignocellulosic biomass is promising for development of the new and efficient manufacturing technologies for production of valuable chemicals.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030126
      Issue No: Vol. 9, No. 3 (2017)
       
  • New methods for the one-pot processing of polysaccharide components
           (cellulose and hemicelluloses) of lignocellulose biomass into valuable
           products. Part 3: Products synthesized via the biotechnological conversion
           of poly- and monosaccharides of biomass
    • Authors: K. N. Sorokina; Yu. V. Samoylova; A. V. Piligaev; Uthandi Sivakumar; V. N. Parmon
      Pages: 270 - 276
      Abstract: Part 3 of the review discusses the modern aspects in the biotechnological synthesis of the valuable chemicals derived from the lignocellulosic biomass, including ethanol, n-butanol, isobutanol, 2,3-butanediol, and lactic and succinic acids. A comparative characteristic of different approaches (including SHF, SSF, SSCF and CBP) toward biosynthesis of valuable products is given. It is shown that the consolidated processing of lignocellulose into the valuable chemicals is a promising approach toward their direct synthesis by fermentation, but remains less efficient than other processing methods. Development of genetic engineering tools and the application of synthetic biology will allow to develop more efficient strains and advanced biotechnological processes for lignocellulose processing.
      PubDate: 2017-07-01
      DOI: 10.1134/s2070050417030138
      Issue No: Vol. 9, No. 3 (2017)
       
  • 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)
       
  • 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)
       
 
 
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