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Erratum to: In Situ Generated Nickel Phosphide Based Catalysts for Hydroprocessing of Levulinic Acid Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Golubeva, M. A.
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Erratum to: Promoting Direct CO2 Conversion to DME over Zeolite-based Hybrid Catalysts Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Frusteri, L., Bonura, G., Cannilla, C., Todaro, S., Giordano, G., Migliori, M., Frusteri, F.
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Erratum to: Recent Progress to Understand and Improve Zeolite Stability in the Aqueous Medium Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Prodinger, Sebastian, Derewinski, Miroslaw A.
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Erratum to: Highly Efficient Mesoporous Mg/γ-Al2O3 Catalysts for Ozonation of Saline Petroleum Effluents Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Xu, Renshun, Nabet, Hervé, Breton, Audrey, Baldoni-Andrey, Patrick, Lesage, Nicolas, Cacciaguerra, Thomas, Hulea, Vasile, Fajula, Francois, Galarneau, Anne
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Erratum to: Impact of Pore Architecture on the Hydroconversion of Long Chain Alkanes over Micro and Mesoporous Catalysts Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Vaugon, Laura, Finiels, Annie, Cacciaguerra, Thomas, Hulea, Vasile, Galarneau, Anne, Aquino, Cindy, Dath, Jean-Pierre, Minoux, Delphine, Gerardin, Corine, Fajula, François
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Erratum to: Heterogeneous Catalyst Based on Phosphine-Containing Organic Polymer for Hydroformylation of Octene-1 Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Gorbunov, D. N., Nenasheva, M. V., Matsukevich, R. P., Terenina, M. V., Kardasheva, Yu. S., Karakhanov, E. A.
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On Identification of C11–C13 Adamantanes in Crude Oils Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Gadzhiev, G. A., Giruts, M. V., Vylekzhanina, D. S., Burov, E. A., Gordadze, G. N.
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Novel Strained Alicyclic Hydrocarbons Based on 5-Methylene-2-norbornene Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Zarezin, D. P., Rudakova, M. A., Samoilov, V. O., Sultanova, M. U., Maximov, A. L., Bermeshev, M. V.
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Changes in the Structure of the High-Molecular-Weight Components of a High-Sulfur Vacuum Residue in the Initiated Cracking Process Pet. Chem. (IF 1.029) Pub Date : 2021-09-22 Goncharov, A. V., Krivtsov, E. B.
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Extractive Removal of Basic and Neutral Nitrogen Compounds from Naphtha and Kerosene by Deep Eutectic Solvents Based on Triethylamine and Aromatic Acids Pet. Chem. (IF 1.029) Pub Date : 2021-09-08 Liu, Linhai, Xie, Wenjing, Liu, Xunzheng, Fang, Hansun, Wen, Yangping, Shu, Chenhua
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Geochemical Analysis of Crude Oils in Kaliningrad Oblast Oil Fields and its Importance for Oil Production Pet. Chem. (IF 1.029) Pub Date : 2021-09-08 Okhotnikova, E. S., Yusupova, T. N., Barskaya, E. E., Ganeeva, Yu. M., Mukhametshin, R. Z.
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Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia Pet. Chem. (IF 1.029) Pub Date : 2021-09-08 Stevanovic, J., Rakitin, A. R., Stojanovic, K.
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The Effect of Sulfonate Groups in the Structure of Porous Aromatic Frameworks on the Activity of Platinum Catalysts Towards Hydrodeoxygenation of Biofuel Components Pet. Chem. (IF 1.029) Pub Date : 2021-09-03 Kalinina, M. A., Kulikov, L. A., Cherednichenko, K. A., Maximov, A. L., Karakhanov, E. A.
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Chemical Heterogeneity of Deposits Formed in the Flocculant Flow From Crude Oil, According to FTIR Microscopy and Chemical Imaging Pet. Chem. (IF 1.029) Pub Date : 2021-09-03 Shalygin, A. S., Milovanov, E. S., Yakushkin, S. S., Martyanov, O. N.
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IFT Assisted Enhancement of Asphaltene Stability in Light/Heavy Oil Using Surfactants Pet. Chem. (IF 1.029) Pub Date : 2021-08-09 Razipour, Majid, Giri, Mohammad Samipour, Majidian, Nasrollah
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Synthesis of Butadiene from Formaldehyde and Propylene on Cesium Salts of Silicotungstic Heteropoly Acid Pet. Chem. (IF 1.029) Pub Date : 2021-08-09 Ponomareva, О. А., Matveeva, О. D., Nikiforov, A. I., Dobryakova, I. V., Kasyanov, I. A., Shkuropatov, A. V., Ivanova, I. I.
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Silicoaluminophosphate Molecular Sieves SAPO-11 and SAPO-41: Synthesis, Properties, and Applications for Hydroisomerization of C16+ n-Paraffins. Part 2: Current State of Research on Methods to Control the Crystal Morphology, Dispersion, Acidic Properties, Secondary Porous Structure, and Catalytic Properties of SAPO-11 and SAPO-41 in Hydroisomerization of C16+ n-Paraffins (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-08-09 Agliullin, M. R., Kutepov, B. I., Ostroumova, V. A., Maximov, A. L.
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Alkylation of Benzene with Propylene on Hierarchical MWW Zeolites Prepared by Recrystallization Pet. Chem. (IF 1.029) Pub Date : 2021-08-09 Shkuropatov, A. V., Popov, A. G., Ivanova, I. I.
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High-Selectivity Polysiloxane Membranes for Gases and Liquids Separation (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-08-09 Grushevenko, E. A., Borisov, I. L., Volkov, A. V.
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Effect of Metal Cations on the Microstructure of Sol-Gel-Synthesized Silica Pet. Chem. (IF 1.029) Pub Date : 2021-08-04 Tarasenko, E. A., Lebedeva, O. E.
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Silicoaluminophosphate Molecular Sieves SAPO-11 and SAPO-41: Synthesis, Properties, and Applications for Hydroisomerization of C16+ n-Paraffins. Part 1: Current State of Research on SAPO-11 and SAPO-41 Synthesis (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-08-04 Agliullin, M. R., Kutepov, B. I., Ostroumova, V. A., Maximov, A. L.
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Hydrogenation/Dehydrogenation Catalysts for Hydrogen Storage Systems Based on Liquid Organic Carriers (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-08-04 Makaryan, I. A., Sedov, I. V.
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Evaluation of the Properties of ZSM-5 Type Zeolites Modified with CexMg1–xAl2O4 Nanopowders in the Toluene Disproportionation Reaction Pet. Chem. (IF 1.029) Pub Date : 2021-08-04 Kerimli, F. Sh., Ilyasli, T. M., Mammadov, S. E., Akhmedova, N. F., Mammadov, E. S., Makmudova, N. I., Akhmedov, E. I.
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31Р NMR Spectroscopy of Adsorbed Probe Molecules as a Tool for the Determination of the Acidity of Molecular Sieve Catalysts (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Zasukhin, D. S., Kostyukov, I. A., Kasyanov, I. A., Kolyagin, Yu. G., Ivanova, I. I.
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Synthesis, Identification, and Isolation of Esters of Pentaerythritol and Linear С4–С7 Carboxylic Acids Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Emelyanov, V. V., Krasnykh, E. L., Fetisov, D. A., Levanova, S. V., Shakun, V. A.
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Halloysite, Natural Aluminosilicate Nanotubes: Structural Features and Adsorption Properties (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Atyaksheva, L. F., Kasyanov, I. A.
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Effect of Binder Content on the Properties of Nanocrystalline Zeolite BEA-based Catalysts for Benzene Alkylation with Propylene Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Bok, T. O., Andriako, E. P., Ivanova, I. I.
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Intermediate Aluminophosphates as a Tool of Control over the Morphology and Secondary Porous Structure of AlPO4-11 Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Agliullin, M. R., Kutepov, B. I.
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Kinetic Characteristic of the Reaction Rate Constant in Multicomponent Reaction Systems Pet. Chem. (IF 1.029) Pub Date : 2021-07-30 Samoilov, N. A.
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Non-Catalytic Steam Reforming of C1–C4 Hydrocarbons Pet. Chem. (IF 1.029) Pub Date : 2021-07-13 V. I. Savchenko, Ya. S. Zimin, A. V. Nikitin, I. V. Sedov, V. S. Arutyunov
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Pt and Ru Catalysts Based on Porous Aromatic Frameworks for Hydrogenation of Lignin Biofuel Components Pet. Chem. (IF 1.029) Pub Date : 2021-07-13 L. A. Kulikov, D. A. Makeeva, M. A. Kalinina, K. A. Cherednichenko, A. L. Maximov, E. A. Karakhanov
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Oxidation of Propane: Influence of the Nature of Catalyst, Cocatalyst, and Coreductant Pet. Chem. (IF 1.029) Pub Date : 2021-07-13 E. G. Chepaikin, G. N. Menchikova, S. I. Pomogailo
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Hydroconversion of n-Hexadecane on Zeolite-Containing Sulfide-Based Catalysts: Influence of Nitrogen Impurity in the Feedstock on the Hydroisomerization Selectivity Pet. Chem. (IF 1.029) Pub Date : 2021-07-13 N. A. Vinogradov, M. I. Rubtsova, A. P. Glotov, N. V. Tochilin, V. A. Vinokurov, A. A. Pimerzin
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Crystallization of Zeolites in the Presence of Diquaternary Alkylammonium Salts Derived from Dimethylethanolamine Pet. Chem. (IF 1.029) Pub Date : 2021-07-08 D. E. Tsaplin, E. R. Naranov, L. A. Kulikov, I. S. Levin, S. V. Egazar’yants, A. L. Maximov, E. A. Karakhanov
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Activity of Various Cation-Exchange Forms of LSX and X Zeolites in СО2 Adsorption Pet. Chem. (IF 1.029) Pub Date : 2021-07-08 I. N. Pavlova, O. S. Travkina, G. F. Garieva, B. I. Kutepov
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Macrostructural Parameters of Asphaltene Nanoaggregates in Natural Asphaltite and in Its Supercritical Water Conversion Products Pet. Chem. (IF 1.029) Pub Date : 2021-07-07 V. R. Antipenko, O. N. Fedyaeva, A. A. Vostrikov
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Novel Molybdenite-Based Nanopowder Catalysts for Hydrodesulfurization Pet. Chem. (IF 1.029) Pub Date : 2021-07-07 T. A. Fedushchak, M. A. Uimin, V. V. Maikov, A. S. Akimov, S. P. Zhuravkov, A. V. Vosmerikov, I. P. Prosvirin, L. M. Velichkina, A. A. Stepanov, V. M. Kogan
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Micro-Mesoporous Catalyst Based on Natural Aluminosilicate Nanotubes and ZSM-5 Zeolite for Methanol Conversion to Hydrocarbons Pet. Chem. (IF 1.029) Pub Date : 2021-07-07 E. M. Smirnova, D. P. Melnikov, N. R. Demikhova, M. I. Rubtsova, S. S. Boev, E. E. Brindukova, A. P. Glotov, V. A. Vinokurov
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Synthesis of Highly Active Nanozeolites Using Methods of Mechanical Milling, Recrystallization, and Dealumination (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-07-07 P. S. Kuznetsov, K. I. Dementiev, T. A. Palankoev, D. S. Kalmykova, V. V. Malyavin, A. D. Sagaradze, A. L. Maximov
Abstract Methods for preparing zeolites with the particle size of 50–200 nm using mechanical milling on bead mills (top-down approach) are analyzed. The milling can be described by a first-order rate equation, but mathematical models allowing prediction of the particle size and degree of crystallinity of zeolite after milling, based on the process parameters, are still lacking. The milling is accompanied
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Microwave-Assisted Plasma Catalytic Conversion of Tar to Hydrocarbon Products Pet. Chem. (IF 1.029) Pub Date : 2021-06-18 M. V. Tsodikov, A. V. Chistyakov, G. I. Konstantinov, R. S. Borisov, G. N. Bondarenko, O. V. Arapova
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Effects of Support on the Formation and Activity of Gold Catalysts for Ethanol Conversion to Butanol Pet. Chem. (IF 1.029) Pub Date : 2021-06-18 S. A. Nikolaev, A. V. Chistyakov, P. A. Chistyakova, D. I. Ezzhelenko, E. Yu. Liberman, T. V. Konkova, M. V. Tsodikov
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Composition of the Resin-Asphaltene Components in the Interfacial Layers of Water-in-Oil Emulsions Pet. Chem. (IF 1.029) Pub Date : 2021-06-17 N. V. Yudina, N. A. Nebogina, I. V. Prozorova
Abstract Formation of stable water-in-oil emulsions in light and heavy crude oils was shown to involve the buildup of interfacial layer characterized by increased contents of the main emulsifiers, asphaltenes and resins. An increase in the proportion of asphaltenes in the interfacial layer, nearly 4-fold for the light oil and 1.3-fold for the heavy oil samples, was accompanied by changes in their elemental
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Distribution of Vanadium and Nickel During Sequential Fractionation of Heavy Crude Oil Resins by Adsorption Chromatographic Separation and Extraction Pet. Chem. (IF 1.029) Pub Date : 2021-06-17 S. G. Yakubova, G. R. Abilova, E. G. Tazeeva, Yu. Yu. Borisova, D. V. Milordov, D. I. Tazeev, N. A. Mironov, M. R. Yakubov
Abstract Specific features of the distribution of vanadium and nickel during fractionation of heavy oil resins were examined using the example of heavy sulfurous oils from the Permian and Carboniferous deposits of the Volga-Urals oil and gas basin (Russian Federation). Fractionation of the resins was performed by silica gel column chromatography, followed by extraction with dimethylformamide (DMF)
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Systems Analysis of the Evolution of Views on Oil Systems: From Petroleum Chemistry to Petroinformatics Pet. Chem. (IF 1.029) Pub Date : 2021-06-16 R. Z. Safieva, V. D. Mishin
Abstract Essentially different approaches to studying oil systems (analytical, colloid-chemical, model, chemo-informational), regardless of the chronological periods of their development, are described. The analytical approach, being historically first, today, with the progress of petroleomics, becomes the source of digital data on the detailed chemical composition of oil systems, which is particularly
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Transformation of Carbon-Rich Organic Components of a Domanik Rock in Sub- and Supercritical Aqueous Fluids Pet. Chem. (IF 1.029) Pub Date : 2021-06-16 Z. R. Nasyrova, G. P. Kayukova, A. V. Vakhin, B. I. Gareev, A. A. Eskin
Abstract The paper identifies major features that distinguish the transformation of organic matter (OM) of rocks in the Semiluki (Domanik) deposits into solid, liquid, and gaseous products when exposed to sub- and supercritical water under various temperature and pressure conditions. To this end, a set of modern instrumental methods were used, namely: Rock–Eval, elemental analysis, GC, GC/MS, IR spectroscopy
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Geochemistry of Crude Oils of the Van-Yeganskoye Oil and Gas Condensate Field Pet. Chem. (IF 1.029) Pub Date : 2021-06-16 E. A. Fursenko, L. S. Borisova, A. I. Burukhina, R. M. Saitov
Abstract The paper summarizes the available analytical data on the physicochemical properties of the Jurassic and Cretaceous crude oils in the Van-Yeganskoye field, on the percentages of saturated and aromatic compounds in these oils, and on the elemental and structural-group compositions of their resins and asphaltenes (RAM). The hydrocarbon geochemistry and the RAM structural-group compositions show
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Distribution Patterns of Main Structural-Group Parameters of Crude Oils from Lena–Tunguska Oil-and-Gas Basin According to 13C NMR Data Pet. Chem. (IF 1.029) Pub Date : 2021-06-03 M. B. Smirnov, N. A. Vanyukova
Abstract The distributions of the 13C NMR-measured structural-group composition parameters of the Lena–Tunguska basin crude oils were obtained. All these distributions were shown to be far from normal, many of them being asymmetric and/or bimodal. These oils exhibit a significantly lower content of aromatics than the Volga–Urals and Western Siberia oils. The principal maximum of Car distribution lies
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Composition and Distribution of Microelements in Rocks, Extracts, and Asphaltenes from Domanik Deposits of Various Lithologo-Facial Types of Romashkino Oilfield Pet. Chem. (IF 1.029) Pub Date : 2021-06-03 G. P. Kayukova, A. N. Mikhailova, B. I. Gareev, Z. R. Nasyrova, A. V. Vakhin
Abstract Comparative studies were made of the microelement composition of rock samples from Domanik deposits of different lithologo-facial types: from Semiluki–Mendym (Domanik) deposits of the Berezovskaya area and from carbonate domanikoid deposits of the Dankovo–Lebedyan horizon of the Zelenogorskaya area of the Romashkino oilfield. These samples differ in the organic matter (OM) content and in the
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Redistribution of Asphaltenes in Modeling of a Nonequilibrium Reservoir State Pet. Chem. (IF 1.029) Pub Date : 2021-05-28 E. S. Okhotnikova, Yu. M. Ganeeva, E. E. Barskaya, T. N. Yusupova
Abstract The paper describes a process of crude oil differentiation in an oil reservoir induced by an inflow of light hydrocarbons. It was shown that when an oil-rich carbonate rock is destabilized the redistribution of oil components occurs due to the adsorption and/or precipitation of asphaltenes on the rock and their gravitational separation. More compact asphaltene aggregates concentrate in the
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Evaluating the Optimal Capacity for the Implementation of Fluidized Catalytic Cracking in the Refinery by the Technical and Economic Analysis Pet. Chem. (IF 1.029) Pub Date : 2021-05-28 B. H. Aregawi, F. A. Atiku, V. Pirouzfar, C.-H. Su, F.-M. Wang
Abstract Fluidized catalytic cracking (FCC) unit has vital role in the process of modern refineries because this unit is used for production of valuable refinery products. The aim of this research is to study different capacities of the feedstock in FCC unit and to find the maximum available capacity with consideration of technical and economic criteria. In this regard, process simulation of this unit
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Erratum to: Process Solutions for Recovery of Dimethyl Ether Produced Through One-Step Synthesis and Their Assessment Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 M. I. Afokin, M. V. Magomedova
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In Situ Generated Organic Peroxides in Oxidative Desulfurization of Naphtha Reformate Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 E. A. Eseva, A. V. Akopyan, N. A. Sinikova, A. V. Anisimov
Abstract The paper describes a method developed for the oxidation of organosulfur compounds using organic peroxides generated in situ under the action of atmospheric oxygen on gasoline fraction after reforming. Naphtha reformate that contained dibenzothiophene as a model substrate was subjected to oxidative desulfurization by organic peroxides generated in situ under atmospheric oxygen. The study examined
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Optimization of Methods for Purification of Gas Mixtures to Remove Carbon Dioxide (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 E. G. Novitskii, S. D. Bazhenov, A. V. Volkov
Abstract This review provides an analysis of modern process technologies for carbon dioxide removal from various gas mixtures (such as natural gas or hydrocarbon conversion gases in ammonia and syngas production facilities), as well as from flue gases generated during the combustion of carbon-containing feedstocks in power plants. The review also discusses various approaches to improve absorption/desorption
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Combined Synthesis and Hydroprocessing of Hydrocarbons over Co/SiO 2 + ZSM-5 + Al 2 O 3 Catalysts Promoted by Nickel Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 R. E. Yakovenko, I. N. Zubkov, V. G. Bakun, A. P. Savost’yanov
Abstract The study investigates the effects of nickel introduction methods on the properties of a hybrid cobalt catalyst in a combination of Fischer–Tropsch synthesis and the hydroprocessing of the synthesized products. At 240°C, 2 MPa, and syngas WHSV 1000 h–1, the catalytic performances were compared, the products were analyzed for the hydrocarbon and fractional compositions, and the characteristics
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Regeneration of a Porous Iron-Containing Carbon Adsorbent under Plasma-Catalytic Conditions Assisted by Microwave Irradiation Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 A. V. Chistyakov, E. Yu. Liberman, V. I. Pasevin, G. N. Bondarenko, O. V. Arapova, M. V. Tsodikov
Abstract This article reports experimental data on a double-step technology for processing a model organic contaminant (m-cresol) adsorbed in the pores of an iron-containing carbon adsorbent (specific surface area 616 m2/g) under microwave irradiation. The first step comprised the decomposition of cresol into a hydrogen-containing gas and a carbon residue under plasma-catalytic conditions assisted
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TGA-Based Thermokinetics of High-Viscosity Oil Decomposition in the Presence of Nanocatalysts, Catalytic Additives, and Polymers Pet. Chem. (IF 1.029) Pub Date : 2021-05-20 A. T. Yedrissov, D. E. Aitbekova, A. Tusipkhan, A. B. Tateyeva, G. G. Baikenova, M. I. Baikenov, D. A. Kaikenov
Abstract The paper provides experimentally determined thermokinetics of the thermal decomposition of high-viscosity oil (HVO) from the Karazhanbas field, the Republic of Kazakhstan, in the presence of a Fe3O4 nanocatalyst, catalytic additives (nickel catalytic additives in microspheres prepared from coal ash), and polymers (such as polyethylene glycol and polystyrene) as hydrogen donors. The HVO decomposition
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Acetylene Hydrogenation on Pd–Zn/Sibunit Catalyst: Effect of Solvent and Carbon Monoxide Pet. Chem. (IF 1.029) Pub Date : 2021-04-27 D. V. Glyzdova, T. N. Afonasenko, V. L. Temerev, D. A. Shlyapin
Abstract The effect of the presence of the N-methyl-2-pyrrolidone (NMP) solvent, on the properties of Pd–Zn/Sibunit catalyst in hydrogenation of a gas mixture enriched in acetylene and hydrogen was studied. It was found that owing to selective solubility of alkanes and alkynes in the NMP medium and to the action of bimetallic Pd–Zn active sites, transformations of the formed C2H4 are efficiently suppressed
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Recent Advances in Biodegradable Lubricating Materials (A Review) Pet. Chem. (IF 1.029) Pub Date : 2021-04-27 A. M. Danilov, S. A. Antonov, R. V. Bartko, P. A. Nikulshin
Abstract State of the art in the field of using biodegradable lubricating materials is considered, and data on recent achievements in their use are summarized. The major factors influencing the progress of studies in this field are associated with the environmental regulations becoming more and more stringent. Along with the use of poly(alkylene glycol) and ester liquids, raw materials of vegetable
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Kinetics of Cyclohexanol Dehydrogenation for Cu-Containing Supported Catalysts with the Active Component in Different Forms Pet. Chem. (IF 1.029) Pub Date : 2021-04-27 V. I. Vanchurin, O. Yu. Salnikova, O. I. Karachenko
Abstract The study investigates the properties of industrial-scale supported copper-containing catalysts, H3-11 and MAK-K, in the dehydrogenation of cyclohexanol. These catalysts differ in the mechanism employed for the active component’s immobilization on a silica support: physically bound in the former case and chemically bound in the latter. Within set ranges of temperatures and space velocities
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Effects of the Composition and Molecular Structure of Asphaltenes on the Properties of Heavy Petroleum Feedstock Represented by Heavy Oil from the Ashalchinskoye Field and Two Vacuum Residue Samples Pet. Chem. (IF 1.029) Pub Date : 2021-04-27 D. I. Panyukova, R. N. Magomedov, E. Yu. Savonina, T. A. Maryutina
Abstract A combination of analytical methods (including CHNS-O elemental analysis, X-ray diffraction, 1H and 13C NMR spectroscopy, MALDI-TOF and ICP mass spectrometry) was used to determine the elemental composition and average molecular and structural parameters of asphaltenes isolated from a heavy oil sample from the Ashalchinskoye field and vacuum residue samples from two different Russian oil refineries
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