In this study, two groups of functionalized aliphatic and aromatic ILs with the same anions were synthesized and used as asphaltene dispersants. The quartz crystal microbalance and ultraviolet spectroscopy were used in this study, and the results obtained from these two techniques were in relatively good agreement with each other. The results showed that aromatic ILs generally possess better inhibitory performance than aliphatic ones. The molecular structure of IL anions also greatly influenced the dispersion of asphaltenes in a toluene solution. It seems that π-π interactions between asphaltene molecules and aromatic cations represent the main cause of the better performance of aromatic ILs. This hypothesis was also confirmed by observing the high dispersion ability of a maleate anion, which has a carbon-carbon double bond, compared to other studied anions.
摘要 本研究合成了两组具有相同阴离子的官能化脂肪族和芳香族 IL，并将其用作沥青分散剂。研究采用了石英晶体微天平和紫外光谱技术，这两种技术得出的结果具有较好的一致性。结果表明，芳香族 IL 的抑制性能普遍优于脂肪族 IL。IL 阴离子的分子结构对沥青烯在甲苯溶液中的分散也有很大影响。沥青烯分子与芳香阳离子之间的 π-π 相互作用似乎是芳香族聚合硫醇具有更佳性能的主要原因。观察到具有碳碳双键的马来酸阴离子与其他研究阴离子相比具有更高的分散能力，也证实了这一假设。
{"title":"Functionalized Ionic Liquids as Asphaltene Dispersants: A Comparison between Aliphatic and Aromatic Cations","authors":"Edris Mardani, Babak Mokhtari, Bahram Soltani Soulgani, Shirin Baghersaei","doi":"10.1134/s0965544123110075","DOIUrl":"https://doi.org/10.1134/s0965544123110075","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, two groups of functionalized aliphatic and aromatic ILs with the same anions were synthesized and used as asphaltene dispersants. The quartz crystal microbalance and ultraviolet spectroscopy were used in this study, and the results obtained from these two techniques were in relatively good agreement with each other. The results showed that aromatic ILs generally possess better inhibitory performance than aliphatic ones. The molecular structure of IL anions also greatly influenced the dispersion of asphaltenes in a toluene solution. It seems that π-π interactions between asphaltene molecules and aromatic cations represent the main cause of the better performance of aromatic ILs. This hypothesis was also confirmed by observing the high dispersion ability of a maleate anion, which has a carbon-carbon double bond, compared to other studied anions.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140053642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-09DOI: 10.1134/s0965544123110014
V. I. Savchenko, A. V. Ozerskii, A. V. Nikitin, I. V. Sedov, V. S. Arutyunov
Abstract
The paper reports the results of a kinetic and thermodynamic analysis of non-catalytic partial oxidation of methane and C2–C4 hydrocarbon/hydrogen mixtures (C/H = 1 : 4) at 1400–1700 K. The hydrocarbon conversion sequence and the time periods of the major process stages were identified for isothermal conditions. The initial stage of the oxidative conversion of C2+ hydrocarbons consists of their pyrolysis, primarily into ethylene and propylene, followed by oxidation of the pyrolysis products. In this respect, the kinetics of C2+ hydrocarbon oxidative conversion are different from those of methane conversion, marked by the almost simultaneous and significantly slower occurrence of pyrolysis and oxidation. The subsequent stages involve steam and dry reforming of the oxidation products, namely acetylene and methane; these stages continue until the main products (H2, CO, CO2, and H2O) reach an equilibrium distribution for the given temperature. The study findings are important for the optimization of various techniques for high-temperature syngas production via partial oxidation of C2+ hydrocarbons, as well as Moderate or Intense Low-Oxygen Dilution (MILD) combustion processes.
{"title":"Non-Catalytic Partial Oxidation of C2+ Hydrocarbon/H2 Mixtures","authors":"V. I. Savchenko, A. V. Ozerskii, A. V. Nikitin, I. V. Sedov, V. S. Arutyunov","doi":"10.1134/s0965544123110014","DOIUrl":"https://doi.org/10.1134/s0965544123110014","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper reports the results of a kinetic and thermodynamic analysis of non-catalytic partial oxidation of methane and C<sub>2</sub>–C<sub>4</sub> hydrocarbon/hydrogen mixtures (C/H = 1 : 4) at 1400–1700 K. The hydrocarbon conversion sequence and the time periods of the major process stages were identified for isothermal conditions. The initial stage of the oxidative conversion of C<sub>2+</sub> hydrocarbons consists of their pyrolysis, primarily into ethylene and propylene, followed by oxidation of the pyrolysis products. In this respect, the kinetics of C<sub>2+</sub> hydrocarbon oxidative conversion are different from those of methane conversion, marked by the almost simultaneous and significantly slower occurrence of pyrolysis and oxidation. The subsequent stages involve steam and dry reforming of the oxidation products, namely acetylene and methane; these stages continue until the main products (H<sub>2</sub>, CO, CO<sub>2</sub>, and H<sub>2</sub>O) reach an equilibrium distribution for the given temperature. The study findings are important for the optimization of various techniques for high-temperature syngas production via partial oxidation of C<sub>2+</sub> hydrocarbons, as well as Moderate or Intense Low-Oxygen Dilution (MILD) combustion processes.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140053782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-09DOI: 10.1134/s0965544123110051
P. D. Domashkina, K. P. Gevorgyan, A. V. Akopyan
Abstract
A review of studies in the field of oxidation of organic substrates with sodium hypochlorite, published in the past 15–20 years, is presented. Oxidation of primary and secondary alcohols, epoxidation of olefins, oxidative desulfurization, and nitrogen oxide oxidation are described. A comparative analysis of various catalytic systems used in this field is made. Industrial uses of sodium hypochlorite, in particular, for wastewater treatment, are described. The main directions of using sodium hypochlorite and the related prospects and problems are outlined.
{"title":"Oxidation of Organic Substrates with Sodium Hypochlorite (A Review)","authors":"P. D. Domashkina, K. P. Gevorgyan, A. V. Akopyan","doi":"10.1134/s0965544123110051","DOIUrl":"https://doi.org/10.1134/s0965544123110051","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A review of studies in the field of oxidation of organic substrates with sodium hypochlorite, published in the past 15–20 years, is presented. Oxidation of primary and secondary alcohols, epoxidation of olefins, oxidative desulfurization, and nitrogen oxide oxidation are described. A comparative analysis of various catalytic systems used in this field is made. Industrial uses of sodium hypochlorite, in particular, for wastewater treatment, are described. The main directions of using sodium hypochlorite and the related prospects and problems are outlined.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140053674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A salt-tolerant polymer based on hydrophobically associating water-soluble polymers of 1-vinyl-2-pyrrolidone, allyl polyethylene glycol, acrylamide, and N,N′-dimethyl octadecyl allyl ammonium chloride has been synthesized. Salt thickening and rheological performance of the polymer solutions have been studied. Polymer solutions have demonstrated an excellent uninterruptedly thickening ability within a wide range of salt concentrations. When concentrations of NaCl and CaCl2 reached 19.9 and 19.3%, the apparent viscosity of a 1% polymer solution increased to 660 and 330 mPa s, respectively. Meanwhile, polymer solutions containing high NaCl or CaCl2 concentrations showed good viscoelasticity, shear resistance, and temperature resistance. A scanning electron microscopy showed that increase in a salt concentration enhanced the hydrophobic association strength of polymer solutions and increased the density of the formed network structure, which was macroscopically manifested as a viscosity increase. The results of this study may promote the research and development of polymers resistant to extreme salt concentrations.
{"title":"Synthesis and Performance of a Salt-Tolerant Poly(AM/NVP/APEG/DMAAC-18) Polymer","authors":"Haiyang Tian, Jiapeng Zheng, Tong Peng, Xiaoping Qin","doi":"10.1134/s096554412311004x","DOIUrl":"https://doi.org/10.1134/s096554412311004x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A salt-tolerant polymer based on hydrophobically associating water-soluble polymers of 1-vinyl-2-pyrrolidone, allyl polyethylene glycol, acrylamide, and <i>N,N</i>′-dimethyl octadecyl allyl ammonium chloride has been synthesized. Salt thickening and rheological performance of the polymer solutions have been studied. Polymer solutions have demonstrated an excellent uninterruptedly thickening ability within a wide range of salt concentrations. When concentrations of NaCl and CaCl<sub>2</sub> reached 19.9 and 19.3%, the apparent viscosity of a 1% polymer solution increased to 660 and 330 mPa s, respectively. Meanwhile, polymer solutions containing high NaCl or CaCl<sub>2</sub> concentrations showed good viscoelasticity, shear resistance, and temperature resistance. A scanning electron microscopy showed that increase in a salt concentration enhanced the hydrophobic association strength of polymer solutions and increased the density of the formed network structure, which was macroscopically manifested as a viscosity increase. The results of this study may promote the research and development of polymers resistant to extreme salt concentrations.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140053675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-15DOI: 10.1134/s0965544123090050
V. A. Tuskaev, S. Ch. Gagieva, K. F. Magomedov, M. D. Evseeva, E. G. Kononova, D. A. Davydov, I. V. Karandi, V. S. Bogdanov, B. M. Bulychev
Abstract
A series of novel complexes of titanium(IV) with OSSO-type ligands were synthesized. In the presence of Al/Mg activators such as {Et2AlCl+Bu2Mg} and {Et3Al2Cl3+Bu2Mg}, all the synthezed compounds catalyzed the polymerization of ethylene (with activity up to 2554 kgPE molM–1 h–1 atm–1). The otained ultrahigh-molecular-weight polyethylene (UHMWPE) samples had a molecular weight up to 7.6×106 Da and exhibited high melting points (up to 143°C) and high crystallinity (up to 84%). It was demonstrated that these polymers can be processed by a solvent-free method into high-strength/high-modulus oriented films (with breaking strength up to 2.2 hPa and elastic modulus up to 127.7 hPa). The synthesized compounds further manifested themselves as efficient pre-catalysts (as indicated by their catalytic activity up to 408 kgcopolymer molM–1 h–1 atm–1) for the preparation of ethylene–propylene copolymers with high propylene incorporation (up to 37%).
{"title":"Ti(IV) Complexes with OSSO-Type Diol Ligands as Catalysts for Synthesis of Ultrahigh-Molecular-Weight Polyethylene and Ethylene–Propylene Copolymers","authors":"V. A. Tuskaev, S. Ch. Gagieva, K. F. Magomedov, M. D. Evseeva, E. G. Kononova, D. A. Davydov, I. V. Karandi, V. S. Bogdanov, B. M. Bulychev","doi":"10.1134/s0965544123090050","DOIUrl":"https://doi.org/10.1134/s0965544123090050","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A series of novel complexes of titanium(IV) with OSSO-type ligands were synthesized. In the presence of Al/Mg activators such as {Et<sub>2</sub>AlCl+Bu<sub>2</sub>Mg} and {Et<sub>3</sub>Al<sub>2</sub>Cl<sub>3</sub>+Bu<sub>2</sub>Mg}, all the synthezed compounds catalyzed the polymerization of ethylene (with activity up to 2554 kg<sub>PE</sub> mol<sub>M</sub><sup>–1</sup> h<sup>–1</sup> atm<sup>–1</sup>). The otained ultrahigh-molecular-weight polyethylene (UHMWPE) samples had a molecular weight up to 7.6×10<sup>6</sup> Da and exhibited high melting points (up to 143°C) and high crystallinity (up to 84%). It was demonstrated that these polymers can be processed by a solvent-free method into high-strength/high-modulus oriented films (with breaking strength up to 2.2 hPa and elastic modulus up to 127.7 hPa). The synthesized compounds further manifested themselves as efficient pre-catalysts (as indicated by their catalytic activity up to 408 kg<sub>copolymer</sub> mol<sub>M</sub><sup>–1</sup> h<sup>–1</sup> atm<sup>–1</sup>) for the preparation of ethylene–propylene copolymers with high propylene incorporation (up to 37%).</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139753442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-15DOI: 10.1134/s0965544123090086
V. O. Samoilov, Iu. I. Porukova, A. A. Kozhevnikov, V. A. Lavrentev, A. A. Porsin, M. I. Kniazeva
Abstract
The present study investigates the regularities of synthesis of methyl glycerol ethers (MGEs) in direct intermolecular dehydration between glycerol and methanol over BEA-type zeolite. The following reaction conditions were varied during the study: temperature (140, 160, and 180°C), pressure (3.0, 5.0, and 7.0 MPa), volume hourly space velocity (0.5 and 1.0 h–1), and methanol to glycerol molar ratio (5 : 1 and 10 : 1). The compositions of the reaction mixtures prepared, as well as the isomeric compositions of the mono- and disubstituted glycerol ethers, were described. The material balances of the process were provided for each combination of operating conditions. The variations in the glycerol conversion, the yields of MGEs, the yield of dimethyl ether as a by-product, and the selectivity towards monomethyl glycerol ethers (relative to dimethyl ones) were investigated as functions of the reaction conditions.
{"title":"Synthesis of Methyl Glycerol Ethers over a Zeolite Catalyst in a Fixed-Bed Reactor","authors":"V. O. Samoilov, Iu. I. Porukova, A. A. Kozhevnikov, V. A. Lavrentev, A. A. Porsin, M. I. Kniazeva","doi":"10.1134/s0965544123090086","DOIUrl":"https://doi.org/10.1134/s0965544123090086","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The present study investigates the regularities of synthesis of methyl glycerol ethers (MGEs) in direct intermolecular dehydration between glycerol and methanol over BEA-type zeolite. The following reaction conditions were varied during the study: temperature (140, 160, and 180°C), pressure (3.0, 5.0, and 7.0 MPa), volume hourly space velocity (0.5 and 1.0 h<sup>–1</sup>), and methanol to glycerol molar ratio (5 : 1 and 10 : 1). The compositions of the reaction mixtures prepared, as well as the isomeric compositions of the mono- and disubstituted glycerol ethers, were described. The material balances of the process were provided for each combination of operating conditions. The variations in the glycerol conversion, the yields of MGEs, the yield of dimethyl ether as a by-product, and the selectivity towards monomethyl glycerol ethers (relative to dimethyl ones) were investigated as functions of the reaction conditions.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139753579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-03DOI: 10.1134/s0965544123090013
Abstract
This review discusses recent advances in catalytic hydrodeoxygenation of lignocellulosic biomass. Lignocellulosic biomass is the most promising plant-based raw material for the production of liquid engine fuels or individual petrochemical monomers. Among the several existing techniques for biomass processing, pyrolysis offers superior efficiency. Given that the bio-oil produced by biomass pyrolysis has unsatisfactory performance characteristics caused by the presence of oxygenates, this bio-oil cannot be used directly as a fuel. Hydrodeoxygenation using selective catalysts is able to reduce the oxygen content in bio-oil and to improve its performance characteristics. To this end, bifunctional catalysts that contain active metal sites on an acid support hold promise. Noble metals (e.g., Pt, Pd, and Ru) and/or transition metals (e.g., Ni, Co, and Mo), as well as sulfides and phosphides of transition metals, can be used as an active catalytic phase. Metal oxides (e.g., ZrO2, CeO2, Al2O3, and TiO2), carbon, zeolites (e.g., ZSM-5, Y, Beta, and SAPO-11), and mesoporous silica-based materials (e.g., SBA-15 and MCM-41) have been most often used as supports in hydrodeoxygenation catalysts. However, the implementation and upscaling of the hydrodeoxygenation of biomass pyrolytic bio-oil is limited because of the rapid deactivation of the catalyst in the presence of water, due to sintering and leaching the active phase with acidic components of bio-oil. Therefore, the development of catalysts that would provide high activity and stability under bio-oil hydrodeoxygenation conditions has become one of the most pressing issues for the petrochemical industry.
{"title":"Hydrotreating of Lignocellulosic Bio-Oil (A Review)","authors":"","doi":"10.1134/s0965544123090013","DOIUrl":"https://doi.org/10.1134/s0965544123090013","url":null,"abstract":"<span> <h3>Abstract</h3> <p>This review discusses recent advances in catalytic hydrodeoxygenation of lignocellulosic biomass. Lignocellulosic biomass is the most promising plant-based raw material for the production of liquid engine fuels or individual petrochemical monomers. Among the several existing techniques for biomass processing, pyrolysis offers superior efficiency. Given that the bio-oil produced by biomass pyrolysis has unsatisfactory performance characteristics caused by the presence of oxygenates, this bio-oil cannot be used directly as a fuel. Hydrodeoxygenation using selective catalysts is able to reduce the oxygen content in bio-oil and to improve its performance characteristics. To this end, bifunctional catalysts that contain active metal sites on an acid support hold promise. Noble metals (e.g., Pt, Pd, and Ru) and/or transition metals (e.g., Ni, Co, and Mo), as well as sulfides and phosphides of transition metals, can be used as an active catalytic phase. Metal oxides (e.g., ZrO<sub>2</sub>, CeO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and TiO<sub>2</sub>), carbon, zeolites (e.g., ZSM-5, Y, Beta, and SAPO-11), and mesoporous silica-based materials (e.g., SBA-15 and MCM-41) have been most often used as supports in hydrodeoxygenation catalysts. However, the implementation and upscaling of the hydrodeoxygenation of biomass pyrolytic bio-oil is limited because of the rapid deactivation of the catalyst in the presence of water, due to sintering and leaching the active phase with acidic components of bio-oil. Therefore, the development of catalysts that would provide high activity and stability under bio-oil hydrodeoxygenation conditions has become one of the most pressing issues for the petrochemical industry.</p> <span> <span> <img alt=\"\" src=\"https://static-content.springer.com/image/MediaObjects/11494_2024_8822_Figa_HTML.png\"/> </span> </span> </span>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139678828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02DOI: 10.1134/s0965544123090049
D. P. Melnikov, E. M. Smirnova, M. V. Reshetina, A. P. Glotov, A. A. Novikov, P. A. Gushchin, H. Q. Wang, V. A. Vinokurov
Abstract
The present study investigates a series of gallium-based catalysts supported on natural and composite aluminosilicate mesoporous supports in the CO2-assisted oxidative dehydrogenation of propane. The catalyst supports were prepared by mixing a functional material with a boehmite binder, the functional materials being derived from natural halloysite nanotubes (HNTs). Three different supports were used: pristine HNTs; HNTs with MCM-41 synthesized around halloysite; and HNTs with MCM-41 synthesized inside the halloysite lumen. The CO2-assisted oxidative propane dehydrogenation was tested in the range of 550–700°C at a CO2/C3H8 molar ratio of 2.0. All the catalysts showed comparable propane conversion (from 10–13% to 70–80%) and propylene selectivity (from 80–84 to 30–32%). The highest propylene space-time yield (6.5 mol kgcat–1 h–1) was observed for the Ga/HNT catalyst at 650°C.
{"title":"Mesoporous Gallium-Based Catalysts for Oxidative Dehydrogenation of Propane in the Presence of Carbon Dioxide","authors":"D. P. Melnikov, E. M. Smirnova, M. V. Reshetina, A. P. Glotov, A. A. Novikov, P. A. Gushchin, H. Q. Wang, V. A. Vinokurov","doi":"10.1134/s0965544123090049","DOIUrl":"https://doi.org/10.1134/s0965544123090049","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The present study investigates a series of gallium-based catalysts supported on natural and composite aluminosilicate mesoporous supports in the CO<sub>2</sub>-assisted oxidative dehydrogenation of propane. The catalyst supports were prepared by mixing a functional material with a boehmite binder, the functional materials being derived from natural halloysite nanotubes (HNTs). Three different supports were used: pristine HNTs; HNTs with MCM-41 synthesized around halloysite; and HNTs with MCM-41 synthesized inside the halloysite lumen. The CO<sub>2</sub>-assisted oxidative propane dehydrogenation was tested in the range of 550–700°C at a CO<sub>2</sub>/C<sub>3</sub>H<sub>8</sub> molar ratio of 2.0. All the catalysts showed comparable propane conversion (from 10–13% to 70–80%) and propylene selectivity (from 80–84 to 30–32%). The highest propylene space-time yield (6.5 mol kg<sub>cat</sub><sup>–1</sup> h<sup>–1</sup>) was observed for the Ga/HNT catalyst at 650°C.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139678822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02DOI: 10.1134/s0965544123090062
M. Ya. Visaliev, A. U. Dandaev, A. E. Batov, K. I. Dement’ev, Kh. M. Kadiev
Abstract
The relationships of the two-step regeneration of the slurry-phase hydroconversion catalyst separated as a component of a solid powder from the vacuum residue after distillation of the product obtained by hydroconversion of a mixture of petroleum tar and polymer waste were studied. The low-temperature oxidation of Mo sulfides was studied as the first step. High degree of oxidation of Mo sulfides to oxygen compounds of molybdenum in the highest oxidation state was reached at 250–400°С depending on the heat treatment time (from 30 to 150 min). The efficient oxidation is confirmed by the degree of transfer of the Mo oxides into an ammonia solution in the second step, leaching of the oxidation products obtained in the first step. The low-temperature oxidation of the catalyst concentrate as a component of the toluene-insoluble residue from the hydroconversion of a mixture of petroleum tar and polymer waste allows virtually complete (>95%) recovery of molybdenum compounds by leaching with 10% aqueous ammonia.
{"title":"Regeneration of the Slurry-Phase Hydroconversion Catalyst Precursor","authors":"M. Ya. Visaliev, A. U. Dandaev, A. E. Batov, K. I. Dement’ev, Kh. M. Kadiev","doi":"10.1134/s0965544123090062","DOIUrl":"https://doi.org/10.1134/s0965544123090062","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The relationships of the two-step regeneration of the slurry-phase hydroconversion catalyst separated as a component of a solid powder from the vacuum residue after distillation of the product obtained by hydroconversion of a mixture of petroleum tar and polymer waste were studied. The low-temperature oxidation of Mo sulfides was studied as the first step. High degree of oxidation of Mo sulfides to oxygen compounds of molybdenum in the highest oxidation state was reached at 250–400°С depending on the heat treatment time (from 30 to 150 min). The efficient oxidation is confirmed by the degree of transfer of the Mo oxides into an ammonia solution in the second step, leaching of the oxidation products obtained in the first step. The low-temperature oxidation of the catalyst concentrate as a component of the toluene-insoluble residue from the hydroconversion of a mixture of petroleum tar and polymer waste allows virtually complete (>95%) recovery of molybdenum compounds by leaching with 10% aqueous ammonia.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139678577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-30DOI: 10.1134/s0965544123090025
Abstract
Direct synthesis of liquid hydrocarbons from СО2 and Н2 on a combined bifunctional catalyst consisting of ZnAlOx or ZnCrOx (oxide catalysts for the synthesis of hydrocarbons from СО and Н2) and HZSM-5 zeolites with different SiO2/Al2O3 molar ratios was studied. The physicochemical characteristics of the zeolites, namely, acidity evaluated by temperature-programmed ammonia desorption, porosity, and specific surface area, were examined. The catalyst performance was studied on a micro-pilot installation in the flow recirculation mode at 340°С and a pressure of 10 MPa. The ZnAlOx/ZnZSM-5(40) catalyst exhibits the highest selectivity to С5+ hydrocarbons, which is associated with the presence of strong Brønsted acid sites on its surface.
{"title":"Hydrogenation of СО2 into Hydrocarbons on Bifunctional Catalysts","authors":"","doi":"10.1134/s0965544123090025","DOIUrl":"https://doi.org/10.1134/s0965544123090025","url":null,"abstract":"<span> <h3>Abstract</h3> <p>Direct synthesis of liquid hydrocarbons from СО<sub>2</sub> and Н<sub>2</sub> on a combined bifunctional catalyst consisting of ZnAlO<sub><em>x</em></sub> or ZnCrO<sub><em>x</em></sub> (oxide catalysts for the synthesis of hydrocarbons from СО and Н<sub>2</sub>) and HZSM-5 zeolites with different SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratios was studied. The physicochemical characteristics of the zeolites, namely, acidity evaluated by temperature-programmed ammonia desorption, porosity, and specific surface area, were examined. The catalyst performance was studied on a micro-pilot installation in the flow recirculation mode at 340°С and a pressure of 10 MPa. The ZnAlO<sub><em>x</em></sub>/ZnZSM-5(40) catalyst exhibits the highest selectivity to С<sub>5+</sub> hydrocarbons, which is associated with the presence of strong Brønsted acid sites on its surface.</p> <span> <span> <img alt=\"\" src=\"https://static-content.springer.com/image/MediaObjects/11494_2024_8823_Figa_HTML.png\"/> </span> </span> </span>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号