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S. N. Khadzhiev - One of the best experts on this subject based on the ideXlab platform.
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Activity of a Molybdenum-Containing Composite Nanocatalyst in Vacuum Residue Hydroconversion
Petroleum Chemistry, 2017Co-Authors: Malkan Kh Kadieva, Khusain M Kadiev, E. E. Magomadov, D. V. Gusev, S. N. KhadzhievAbstract:A Мо-containing composite nanocatalyst is synthesized in a Hydrocarbon Medium containing dissolved low-density polyethylene and is sulfided by dimethyl disulfide. The phase and structural compositions of the catalyst are determined. The activity of the composite nanocatalyst in the hydroconversion of West Siberian vacuum residue is investigated. It is shown that the catalyst performance depends on the way of its distribution in the feedstock. The efficiency of composite nanocatalyst Мо-containing particles in hydroconversion is considerably improved when it is combined with the catalyst synthesized in situ.
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Structural transformations of asphaltenes during hydroconversion of vacuum residue with recycling the hydroconversion product distillation residue
Petroleum Chemistry, 2015Co-Authors: Kh. M. Kadiev, Malkan Kh Kadieva, A. E. Batov, N. V. Oknina, O. V. Zaytseva, E. E. Magomadov, E. A. Chernysheva, V. M. Kapustin, S. N. KhadzhievAbstract:The hydroconversion of vacuum residue (VR) with the recycle of the unconverted vacuum residue in the presence of nanosized MoS2 catalyst particles synthesized “in situ” in the Hydrocarbon Medium has been studied. Changes in the molecular structure of asphaltenes from VR and the products of VR hydroconversion in a mixture with the vacuum residue (recycle), depending on the residence time of asphaltenes in the reaction zone, have been described. The main features of structural transformations of asphaltenes during the hydroconversion with recycle have been established. Trends in the structural properties of the asphaltenes with varying different process parameters, such as the residence time and temperature in the reaction Medium, have been compared.
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Formation and properties of nanosized particles of heavy feedstock conversion catalysts dispersed in a Hydrocarbon Medium
Catalysis in Industry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:Efforts in the fields of synthesizing and using nanosized catalyst particles in hydroconversion have intensified in recent years. In this work, we study in detail the formation of dispersed Mo, Al, Fe, Co, and Ni oxide phases with particle sizes of 100–1000 nm via the thermal decomposition of inverted microemulsions based on synthetic surfactants and pentadecane at 200–250°C and metal contents of no more than 0.05 wt %. Native oil stabilizers of a Hydrocarbon microemulsion phase (asphaltenes, light gasoil, and goudron components) reduce the sizes of synthesized particles to 127–200 nm and allow the metal content in a stable suspension to be increased to 2 wt %. Nanosized catalysts (MoS2 with particle sizes of 10–50 nm along with combinations of Al-, Mo-, and Co(Ni)-containing systems) that display high activity in inhibiting the polymerization of high-molecular feedstock components, are synthesized under conditions of goudron hydro-conversion by means of inverted emulsions in situ.
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Synthesis and properties of nanosized systems as efficient catalysts for hydroconversion of heavy petroleum feedstock
Petroleum Chemistry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:The review summarizes published data on the synthesis, physicochemical properties, and activity of nanocatalysts for the hydroconversion of heavy Hydrocarbon feedstocks—atmospheric and vacuum residues. New reaction systems used in the hydroconversion of heavy feedstocks—a slurry reactor and a blacking reactor—are discussed. Particular attention is given to the synthesis of promising nanocatalysts by singlelayer dispersion of powders and thermal or chemical conversion of oil- and water-soluble precursors dispersed in a Hydrocarbon Medium.
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Fischer-Tropsch process in a three-phase system over iron-cobalt catalyst nanoparticles in situ synthesized in a Hydrocarbon Medium
Petroleum Chemistry, 2014Co-Authors: S. N. Khadzhiev, A. S. Lyadov, S. A. Sagitov, M. V. Kulikova, A. Yu. KrylovaAbstract:It has been shown that Fe-Co nanocatalysts in situ synthesized in a Hydrocarbon Medium with a Fe/Co weight ratio of 2–6 can mediate the Fischer-Tropsch synthesis in a three-phase system at a pressure of 20 atm, a temperature of 250–300°C, and a CO/H_2 ratio of 1: 1. The introduction of CO leads to a significant increase in the total activity of the catalyst system ( K _CO reaches 85% at 300°C). However, gas evolution is enhanced and the highest yield of liquid products is as low as 74 g/m^3 in this case. The introduction of K and Al into the Fe-Co catalysts and the optimization of the Fe/Co ratio make it possible to increase the yield of liquid products to 143 g/m^3 (Fe/Co = 2.4) and achieve an efficiency of 337 g/(kg Me h). The Fe-Co nanocatalysts exhibit a high polymerizing activity (Schulz-Flory alpha is higher than 0.8). Hydrocarbons obtained over Fe-Co-K-Al catalysts contain more than 20% olefins. Their amount increases with the increasing Fe concentration in the sample. Oxygenates formed over these catalysts are composed of alcohols by over 90%, of which ethanol prevails (65–70%).
Malkan Kh Kadieva - One of the best experts on this subject based on the ideXlab platform.
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Activity of a Molybdenum-Containing Composite Nanocatalyst in Vacuum Residue Hydroconversion
Petroleum Chemistry, 2017Co-Authors: Malkan Kh Kadieva, Khusain M Kadiev, E. E. Magomadov, D. V. Gusev, S. N. KhadzhievAbstract:A Мо-containing composite nanocatalyst is synthesized in a Hydrocarbon Medium containing dissolved low-density polyethylene and is sulfided by dimethyl disulfide. The phase and structural compositions of the catalyst are determined. The activity of the composite nanocatalyst in the hydroconversion of West Siberian vacuum residue is investigated. It is shown that the catalyst performance depends on the way of its distribution in the feedstock. The efficiency of composite nanocatalyst Мо-containing particles in hydroconversion is considerably improved when it is combined with the catalyst synthesized in situ.
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Hydrogenation processing of oil wastes in the presence of ultrafine catalysts
Petroleum Chemistry, 2015Co-Authors: Khusain M Kadiev, Malkan Kh Kadieva, A. E. Batov, A. U. Dandaev, N. V. Oknina, A. L. MaksimovAbstract:The results of investigations on the processing of carbonaceous waste, namely, oil sludge and oil vacuum distillation residue (vacuum residuum) by hydroconversion in the presence of molybdenum catalyst in situ generated in the Hydrocarbon Medium are presented. A scheme for separation of heavy residue of the Hydrocarbon part of the sludge has been developed. The characteristics of the vacuum residue of the sludge Hydrocarbon part and the vacuum residue of oil distillation have been compared. It has been shown that a high degree of conversion of the heavy Hydrocarbon part of oil sludge can be reached using the complex scheme of separation followed by hydroconversion in the presence of the molybdenum catalyst generated in situ in the Hydrocarbon Medium.
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Structural transformations of asphaltenes during hydroconversion of vacuum residue with recycling the hydroconversion product distillation residue
Petroleum Chemistry, 2015Co-Authors: Kh. M. Kadiev, Malkan Kh Kadieva, A. E. Batov, N. V. Oknina, O. V. Zaytseva, E. E. Magomadov, E. A. Chernysheva, V. M. Kapustin, S. N. KhadzhievAbstract:The hydroconversion of vacuum residue (VR) with the recycle of the unconverted vacuum residue in the presence of nanosized MoS2 catalyst particles synthesized “in situ” in the Hydrocarbon Medium has been studied. Changes in the molecular structure of asphaltenes from VR and the products of VR hydroconversion in a mixture with the vacuum residue (recycle), depending on the residence time of asphaltenes in the reaction zone, have been described. The main features of structural transformations of asphaltenes during the hydroconversion with recycle have been established. Trends in the structural properties of the asphaltenes with varying different process parameters, such as the residence time and temperature in the reaction Medium, have been compared.
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Formation and properties of nanosized particles of heavy feedstock conversion catalysts dispersed in a Hydrocarbon Medium
Catalysis in Industry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:Efforts in the fields of synthesizing and using nanosized catalyst particles in hydroconversion have intensified in recent years. In this work, we study in detail the formation of dispersed Mo, Al, Fe, Co, and Ni oxide phases with particle sizes of 100–1000 nm via the thermal decomposition of inverted microemulsions based on synthetic surfactants and pentadecane at 200–250°C and metal contents of no more than 0.05 wt %. Native oil stabilizers of a Hydrocarbon microemulsion phase (asphaltenes, light gasoil, and goudron components) reduce the sizes of synthesized particles to 127–200 nm and allow the metal content in a stable suspension to be increased to 2 wt %. Nanosized catalysts (MoS2 with particle sizes of 10–50 nm along with combinations of Al-, Mo-, and Co(Ni)-containing systems) that display high activity in inhibiting the polymerization of high-molecular feedstock components, are synthesized under conditions of goudron hydro-conversion by means of inverted emulsions in situ.
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Synthesis and properties of nanosized systems as efficient catalysts for hydroconversion of heavy petroleum feedstock
Petroleum Chemistry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:The review summarizes published data on the synthesis, physicochemical properties, and activity of nanocatalysts for the hydroconversion of heavy Hydrocarbon feedstocks—atmospheric and vacuum residues. New reaction systems used in the hydroconversion of heavy feedstocks—a slurry reactor and a blacking reactor—are discussed. Particular attention is given to the synthesis of promising nanocatalysts by singlelayer dispersion of powders and thermal or chemical conversion of oil- and water-soluble precursors dispersed in a Hydrocarbon Medium.
A. L. Maksimov - One of the best experts on this subject based on the ideXlab platform.
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Thermal depolymerization of polystyrene in highly aromatic Hydrocarbon Medium
Journal of Analytical and Applied Pyrolysis, 2019Co-Authors: K. I. Dement’ev, T. A. Palankoev, Olga A. Alekseeva, Iurii A. Babkin, A. L. MaksimovAbstract:Abstract Data from the thermal depolymerization of polystyrene in a highly aromatic Hydrocarbon Medium (light and heavy cycle oil) have been obtained. The influences of the reaction conditions on the conversion and selectivity have been studied. The maximum yield of styrene obtained in the present work is 84.4% at a polymer conversion of 93.8% in light cycle oil under the following conditions: temperature: 500 °C, vapor residence time: 2.61 s, polymer concentration: 15%. The styrene yield obtained is higher than has been previously reported in the scientific literature. The high selectivity of styrene in the depolymerization reaction can be explained by the fact that under the reaction conditions studied, the formation of styrene dimers in the Hydrocarbon Medium is inhibited.
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Nickel–molybdenum sulfide catalysts supported on an ordered mesoporous polymer for hydrogenating–hydrocracking of model biaromatic petroleum compounds
Petroleum Chemistry, 2017Co-Authors: E. A. Karakhanov, M. P. Boronoev, V. I. Ignat’eva, Yu. S. Kardasheva, T. Yu. Filippova, A. L. MaksimovAbstract:Nickel–molybdenum sulfide catalysts have been synthesized in situ in a Hydrocarbon Medium by the decomposition of the [( n -Bu)_4N]_2Ni(MoS_4)_2 precursor complex supported on an ordered mesoporous phenol–formaldehyde polymer in the presence of a sulfiding agent (dimethyl disulfide). The catalytic properties of the samples have been studied in a batch reactor at 380°C and a hydrogen pressure of 5.0 MPa using the example of naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene. The tests have shown that the conversion of biaromatic substrates is close to quantitative and the use of dimethyl disulfide as a sulfiding agent leads to an increase in the amount of complete hydrogenation products, as evidenced by the high content of the active phase in this case.
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Naphthalene hydrogenation over nickel–tungsten sulfide catalysts synthesized in situ from DMSO–Hydrocarbon Medium emulsions
Petroleum Chemistry, 2017Co-Authors: I. A. Sizova, Sergey Antonov, S. I. Serdyukov, A. L. MaksimovAbstract:A method for synthesizing unsupported nickel–tungsten sulfide hydrodearomatization catalysts by breaking SPAN-80 surfactant-stabilized nonaqueous emulsions of solutions of different precursors in dimethyl sulfoxide (DMSO) in situ in a Hydrocarbon Medium has been first studied using ammonium thiotungstate (NH4)2WS4 and 1-butyl-1-methylpiperidinium nickel thiotungstate [BMPip]2Ni[WS4]2 as precursors and nickel nitrate hexahydrate as a nickel source. The synthesized nickel–tungsten catalysts have been characterized by TEM and XPS. The catalytic activity of the in situ synthesized Ni–W particles in naphthalene hydrogenation has been studied at temperatures of 350–400°C and a hydrogen pressure of 5.0 MPa.
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naphthalene hydrogenation over nickel tungsten sulfide catalysts synthesized in situ from dmso Hydrocarbon Medium emulsions
Petroleum Chemistry, 2017Co-Authors: I. A. Sizova, A. L. Maksimov, S. I. Serdyukov, S V AntonovAbstract:A method for synthesizing unsupported nickel–tungsten sulfide hydrodearomatization catalysts by breaking SPAN-80 surfactant-stabilized nonaqueous emulsions of solutions of different precursors in dimethyl sulfoxide (DMSO) in situ in a Hydrocarbon Medium has been first studied using ammonium thiotungstate (NH4)2WS4 and 1-butyl-1-methylpiperidinium nickel thiotungstate [BMPip]2Ni[WS4]2 as precursors and nickel nitrate hexahydrate as a nickel source. The synthesized nickel–tungsten catalysts have been characterized by TEM and XPS. The catalytic activity of the in situ synthesized Ni–W particles in naphthalene hydrogenation has been studied at temperatures of 350–400°C and a hydrogen pressure of 5.0 MPa.
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Hydrogenation processing of oil wastes in the presence of ultrafine catalysts
Petroleum Chemistry, 2015Co-Authors: Khusain M Kadiev, Malkan Kh Kadieva, A. E. Batov, A. U. Dandaev, N. V. Oknina, A. L. MaksimovAbstract:The results of investigations on the processing of carbonaceous waste, namely, oil sludge and oil vacuum distillation residue (vacuum residuum) by hydroconversion in the presence of molybdenum catalyst in situ generated in the Hydrocarbon Medium are presented. A scheme for separation of heavy residue of the Hydrocarbon part of the sludge has been developed. The characteristics of the vacuum residue of the sludge Hydrocarbon part and the vacuum residue of oil distillation have been compared. It has been shown that a high degree of conversion of the heavy Hydrocarbon part of oil sludge can be reached using the complex scheme of separation followed by hydroconversion in the presence of the molybdenum catalyst generated in situ in the Hydrocarbon Medium.
Khusain M Kadiev - One of the best experts on this subject based on the ideXlab platform.
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Dissolution of Polyethylene in a Hydrocarbon Medium for the Subsequent Reprocessing by Hydroconversion
Russian Journal of Applied Chemistry, 2018Co-Authors: A. M. Gyul’maliev, A. U. Dandaev, A. E. Batov, L. A. Zekel, Khusain M KadievAbstract:Factors influencing the dissolution of high-density polyethylene in petroleum tar to obtain a homogenized solution for the subsequent hydrogenation in the presence of a nanosized catalyst synthesized in situ under the hydroconversion conditions were studied. The calculation of the solubility indices shows that the best solvents for high-density polyethylene are low-molecular-mass alkanes and alkenes present in the paraffin–naphthene fraction of the tar. Because high-density polyethylene has crystalline structure, the dissolution occurs via swelling with the formation of a true solution depending on the ratio of high-density polyethylene to the tar. A conclusion was made that, to reach the best dissolution, the ratio of high-density polyethylene to the tar should be decreased, or the paraffin–naphthene fraction should be additionally introduced.
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Activity of a Molybdenum-Containing Composite Nanocatalyst in Vacuum Residue Hydroconversion
Petroleum Chemistry, 2017Co-Authors: Malkan Kh Kadieva, Khusain M Kadiev, E. E. Magomadov, D. V. Gusev, S. N. KhadzhievAbstract:A Мо-containing composite nanocatalyst is synthesized in a Hydrocarbon Medium containing dissolved low-density polyethylene and is sulfided by dimethyl disulfide. The phase and structural compositions of the catalyst are determined. The activity of the composite nanocatalyst in the hydroconversion of West Siberian vacuum residue is investigated. It is shown that the catalyst performance depends on the way of its distribution in the feedstock. The efficiency of composite nanocatalyst Мо-containing particles in hydroconversion is considerably improved when it is combined with the catalyst synthesized in situ.
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Hydrogenation processing of oil wastes in the presence of ultrafine catalysts
Petroleum Chemistry, 2015Co-Authors: Khusain M Kadiev, Malkan Kh Kadieva, A. E. Batov, A. U. Dandaev, N. V. Oknina, A. L. MaksimovAbstract:The results of investigations on the processing of carbonaceous waste, namely, oil sludge and oil vacuum distillation residue (vacuum residuum) by hydroconversion in the presence of molybdenum catalyst in situ generated in the Hydrocarbon Medium are presented. A scheme for separation of heavy residue of the Hydrocarbon part of the sludge has been developed. The characteristics of the vacuum residue of the sludge Hydrocarbon part and the vacuum residue of oil distillation have been compared. It has been shown that a high degree of conversion of the heavy Hydrocarbon part of oil sludge can be reached using the complex scheme of separation followed by hydroconversion in the presence of the molybdenum catalyst generated in situ in the Hydrocarbon Medium.
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Formation and properties of nanosized particles of heavy feedstock conversion catalysts dispersed in a Hydrocarbon Medium
Catalysis in Industry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:Efforts in the fields of synthesizing and using nanosized catalyst particles in hydroconversion have intensified in recent years. In this work, we study in detail the formation of dispersed Mo, Al, Fe, Co, and Ni oxide phases with particle sizes of 100–1000 nm via the thermal decomposition of inverted microemulsions based on synthetic surfactants and pentadecane at 200–250°C and metal contents of no more than 0.05 wt %. Native oil stabilizers of a Hydrocarbon microemulsion phase (asphaltenes, light gasoil, and goudron components) reduce the sizes of synthesized particles to 127–200 nm and allow the metal content in a stable suspension to be increased to 2 wt %. Nanosized catalysts (MoS2 with particle sizes of 10–50 nm along with combinations of Al-, Mo-, and Co(Ni)-containing systems) that display high activity in inhibiting the polymerization of high-molecular feedstock components, are synthesized under conditions of goudron hydro-conversion by means of inverted emulsions in situ.
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Synthesis and properties of nanosized systems as efficient catalysts for hydroconversion of heavy petroleum feedstock
Petroleum Chemistry, 2014Co-Authors: S. N. Khadzhiev, Khusain M Kadiev, Malkan Kh KadievaAbstract:The review summarizes published data on the synthesis, physicochemical properties, and activity of nanocatalysts for the hydroconversion of heavy Hydrocarbon feedstocks—atmospheric and vacuum residues. New reaction systems used in the hydroconversion of heavy feedstocks—a slurry reactor and a blacking reactor—are discussed. Particular attention is given to the synthesis of promising nanocatalysts by singlelayer dispersion of powders and thermal or chemical conversion of oil- and water-soluble precursors dispersed in a Hydrocarbon Medium.
Aharon Gedanken - One of the best experts on this subject based on the ideXlab platform.
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the interaction between molten gallium and the Hydrocarbon Medium induced by ultrasonic energy can gallium carbide be formed
Journal of the American Ceramic Society, 2017Co-Authors: Vijay Bhooshan Kumar, Manuel Monte, Olivier Mathon, Sakura Pascarelli, Ze'ev Porat, Aharon GedankenAbstract:Ultrasonic irradiation of molten gallium in organic liquids (decane, dodecane, etc.) results in dispersion of the gallium into nanometric spheres. These were examined by several analytical methods XRD, DSC, Raman and IR spectroscopy) as well as electron microscopy (SEM, TEM) and found to be composed of Ga and C. The DSC analysis indicates that the Ga has possibly reacted with carbon, while the Raman spectrum of the product demonstrates a strong additional peak that could not be identified. This work explores the possibility that the product is gallium carbide or another gallium-carbon complex. To investigate the nature of the product, we performed detailed extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) analyses. On the basis of DSC, IR, and Raman it appear to be formation of GaC, whereas the analysis by EXAFS and XANES demonstrated that the gallium is found to be in a higher reduced state (almost metallic), supported by carbon. The question that remains open in addition to the one related to the formation of galium carbide is whether a complex structure, including oxygen contamination is involved in the layers surrounding the Ga as indicated by the EXAFS results.
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The interaction between molten gallium and the Hydrocarbon Medium induced by ultrasonic energy—can gallium carbide be formed?
Journal of the American Ceramic Society, 2017Co-Authors: Vijay Bhooshan Kumar, Manuel Monte, Olivier Mathon, Sakura Pascarelli, Ze'ev Porat, Aharon GedankenAbstract:Ultrasonic irradiation of molten gallium in organic liquids (decane, dodecane, etc.) results in dispersion of the gallium into nanometric spheres. These were examined by several analytical methods XRD, DSC, Raman and IR spectroscopy) as well as electron microscopy (SEM, TEM) and found to be composed of Ga and C. The DSC analysis indicates that the Ga has possibly reacted with carbon, while the Raman spectrum of the product demonstrates a strong additional peak that could not be identified. This work explores the possibility that the product is gallium carbide or another gallium-carbon complex. To investigate the nature of the product, we performed detailed extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) analyses. On the basis of DSC, IR, and Raman it appear to be formation of GaC, whereas the analysis by EXAFS and XANES demonstrated that the gallium is found to be in a higher reduced state (almost metallic), supported by carbon. The question that remains open in addition to the one related to the formation of galium carbide is whether a complex structure, including oxygen contamination is involved in the layers surrounding the Ga as indicated by the EXAFS results.