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Ibuprofen in Lipid Bilayers. MD Simulations 布洛芬在脂质双层中的作用。MD模拟
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-25 DOI: 10.1134/S1990793125701775
E. Shelepova, E. Yakush, N. Medvedev
{"title":"Ibuprofen in Lipid Bilayers. MD Simulations","authors":"E. Shelepova,&nbsp;E. Yakush,&nbsp;N. Medvedev","doi":"10.1134/S1990793125701775","DOIUrl":"10.1134/S1990793125701775","url":null,"abstract":"<p>A systematic study of ibuprofen in various lipid bilayers was carried out using molecular dynamics simulation to refine, complements and generalize previously obtained results. Pure bilayers, both saturated and unsaturated, as well as containing 20 and 40 mol % cholesterol were studied at ibuprofen concentrations up to 3% drug/lipid ratio. It was obtained that ibuprofen exhibits similar behavior in all studied bilayers and concentrations. Ibuprofen molecules are located at the region of the lipid heads, forming hydrogen bonds with lipid oxygen and water molecules, and preferably orientated with their hydrophobic parts inside the bilayer. No tendency for clustering of ibuprofen molecules was observed. They are in active motion, rising towards the head region and dipping into the hydrophobic core, and some of them can change their orientation significantly. Ibuprofen does not noticeably affect the properties of the bilayers at the considered concentrations. However, in the bilayer with 40 mol % cholesterol, we found that ibuprofen molecules appeared more often in the center of the bilayer and caused some disorder of the lipid tails.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"20 4","pages":"407 - 418"},"PeriodicalIF":1.4,"publicationDate":"2026-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural Morphological and Luminescent Properties of Yb3+-Doped K2La1–xYbx(PO3)5 for Near-Infrared Photonic Applications Yb3+掺杂K2La1-xYbx (PO3)5在近红外光子应用中的结构、形态和发光特性
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-25 DOI: 10.1134/S1990793125701702
H. Rahmouni, L. Ajili, S. Sassi, M. Férid
{"title":"Structural Morphological and Luminescent Properties of Yb3+-Doped K2La1–xYbx(PO3)5 for Near-Infrared Photonic Applications","authors":"H. Rahmouni,&nbsp;L. Ajili,&nbsp;S. Sassi,&nbsp;M. Férid","doi":"10.1134/S1990793125701702","DOIUrl":"10.1134/S1990793125701702","url":null,"abstract":"<p>This work explores the structural, morphological, and luminescent characteristics of Yb<sup>3+</sup>-doped K<sub>2</sub>La<sub>1–<i>x</i></sub>Yb<sub><i>x</i></sub>(PO<sub>3</sub>)<sub>5</sub> phosphors, synthesized with varying ytterbium concentrations (<i>x</i> = 0.005, 0.01, 0.05, 0.2). Scanning Electron Microscopy analysis reveals a polycrystalline microstructure with irregular grains and uniform Yb<sup>3+</sup> distribution, confirmed by Energy Dispersive Spectroscopy. X-ray Diffraction patterns indicate a stable monoclinic phase with slight lattice strain at higher doping levels, while Fourier Transform Infrared spectroscopy verifies the integrity of the phosphate framework despite local distortions. Luminescence measurements under 892 nm excitation exhibit characteristic near-infrared emission around 992 nm, with optimal intensity observed at 5% Yb<sup>3+</sup> concentration. The decay time decreases with increasing doping due to quenching effects but is still usable for photonic applications. These results suggest the suitability of K<sub>2</sub>La<sub>1–<i>x</i></sub>Yb<sub><i>x</i></sub>(PO<sub>3</sub>)<sub>5</sub> as a promising candidate for near-infrared emitting materials, especially at intermediate dopant levels.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"20 4","pages":"339 - 348"},"PeriodicalIF":1.4,"publicationDate":"2026-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Catalytic Properties of Pd and a Pd–Cu Composite, Deposited on Alumina from Supercritical CO2, in the Reaction of Selective Hydrogenation of Acetylene 超临界CO2氧化铝表面沉积Pd及Pd - cu复合材料在乙炔选择性加氢反应中的催化性能
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793125701878
M. Yu. Sinev, P. R. Vasyutin, Yu. A. Gordienko, P. V. Markov, M. O. Kostenko, Ya. I. Zuev
{"title":"Catalytic Properties of Pd and a Pd–Cu Composite, Deposited on Alumina from Supercritical CO2, in the Reaction of Selective Hydrogenation of Acetylene","authors":"M. Yu. Sinev,&nbsp;P. R. Vasyutin,&nbsp;Yu. A. Gordienko,&nbsp;P. V. Markov,&nbsp;M. O. Kostenko,&nbsp;Ya. I. Zuev","doi":"10.1134/S1990793125701878","DOIUrl":"10.1134/S1990793125701878","url":null,"abstract":"<p>The catalytic properties of palladium and a palladium–copper composite, both deposited on γ-Al<sub>2</sub>O<sub>3</sub> from a supercritical carbon dioxide (SC CO<sub>2</sub>) medium, were studied in the selective hydrogenation of acetylene to ethylene. Complexes of palladium and copper with hexafluoroacetylacetone were used as precursors of the active component. The acetylene hydrogenation process was studied in a reaction mixture comprising 1.0 vol % C<sub>2</sub>H<sub>2</sub>, 93.7 vol % C<sub>2</sub>H<sub>4</sub>, and 5.3 vol % H<sub>2</sub>, which imitated the mixture used in the industrial process of acetylene removal from ethylene produced by the pyrolysis of hydrocarbon feedstock. It was shown that the Pd/Al<sub>2</sub>O<sub>3</sub> sample obtained by depositing palladium from a SC CO<sub>2</sub> medium with subsequent reduction in hydrogen had an “egg-shell” type of distribution of the active component: it was concentrated in a thin (about 0.07 ± 0.01 mm) outer layer of a spherical support granule with a diameter of 1 mm. In the case of the PdCu/Al<sub>2</sub>O<sub>3</sub> composite, the active component was deposited to a significant depth along the granule diameter and had an uneven distribution. The Pd/Al<sub>2</sub>O<sub>3</sub> sample exhibited high activity and moderate selectivity in acetylene hydrogenation to ethylene. The same sample after crushing and loading into the reactor (fraction 0.2–0.4 mm) demonstrated higher selectivity while maintaining high activity. The PdCu/Al<sub>2</sub>O<sub>3</sub> sample exhibited lower activity and selectivity in the target process. The catalyst properties were shown to depend on the method of obtaining the supported palladium-containing systems, and the transfer processes in the grain and catalyst layer were found to have a significant influence on the performance of the acetylene hydrogenation in an acetylene–ethylene mixture.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1708 - 1716"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the Influence of Micronization of N-Butyl-N-Methyl-1-Phenylpyrrolo[1,2-a]Pyrazine-3-Carboxamide by Rapid Expansion of Supercritical Fluid on the Kinetics of Dissolution from Tablets 超临界流体快速膨胀微细化n -丁基- n -甲基-1-苯基吡咯[1,2-a]吡嗪-3- carboxamide对片剂溶出动力学的影响
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793125701842
V. B. Markeev, A. M. Vorobei, S. V. Tishkov, E. V. Blynskaya, O. O. Parenago, V. L. Dorofeev
{"title":"Study of the Influence of Micronization of N-Butyl-N-Methyl-1-Phenylpyrrolo[1,2-a]Pyrazine-3-Carboxamide by Rapid Expansion of Supercritical Fluid on the Kinetics of Dissolution from Tablets","authors":"V. B. Markeev,&nbsp;A. M. Vorobei,&nbsp;S. V. Tishkov,&nbsp;E. V. Blynskaya,&nbsp;O. O. Parenago,&nbsp;V. L. Dorofeev","doi":"10.1134/S1990793125701842","DOIUrl":"10.1134/S1990793125701842","url":null,"abstract":"<p><i>N</i>-Butyl-<i>N</i>-methyl-1-phenylpyrrolo[1,2-a]pyrazine-3-carboxamide (GML-3) is a compound with both anxiolytic and antidepressant activity. Like most compounds developed as active pharmaceutical ingredients (APIs), it is virtually insoluble in water, which can negatively impact its bioavailability and complicate the development of tablets based on it. According to the Noyes–Whitney equation, the solubilization of poorly soluble APIs in water is possible by increasing the contact area with the aqueous medium or by achieving a supersaturated state in the solution. The surface area of APIs can be increased by micronization using a method such as rapid expansion of a supercritical solution (RESS). The solubility of GML-3 in CO<sub>2</sub> enables its micronization by the RESS method and the development of tablets with the micronized API.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1688 - 1692"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Extraction of Biologically Active Compounds from Aspen (Populus tremula L.) Bark by Supercritical Carbon Dioxide 杨树生物活性物质的提取树皮被超临界二氧化碳
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793125701854
L. Yu. Yarullin, S. A. Kovalenko, Ya. Yu. Korepanova, I. M. Abdulagatov, V. F. Khairutdinov, M. A. Sysoeva, L. Z. Sharafutdinova
{"title":"Extraction of Biologically Active Compounds from Aspen (Populus tremula L.) Bark by Supercritical Carbon Dioxide","authors":"L. Yu. Yarullin,&nbsp;S. A. Kovalenko,&nbsp;Ya. Yu. Korepanova,&nbsp;I. M. Abdulagatov,&nbsp;V. F. Khairutdinov,&nbsp;M. A. Sysoeva,&nbsp;L. Z. Sharafutdinova","doi":"10.1134/S1990793125701854","DOIUrl":"10.1134/S1990793125701854","url":null,"abstract":"<p>Extracts of the bark of the common aspen <i>Populus tremula</i> L. were obtained by supercritical (SC) fluid extraction with carbon dioxide at temperatures of 313.15 and 333.15 K and pressures from 15 to 35 MPa. The component composition of the CO<sub>2</sub> extract of <i>Populus tremula</i> L. bark was determined by chromatography–mass spectrometry, which identified significant amounts of fatty acids and their esters. It was determined that conventional liquid extraction with petroleum ether is significantly less effective than SC CO<sub>2</sub> extraction in terms of the content of steroidal and triterpenoid components of <i>Populus tremula</i> L. bark in the final product.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1693 - 1700"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of the Combustion of Coals in an Oxygen Atmosphere and Water–Oxygen Fluid at Elevated Pressure 煤在氧气气氛和高压水-氧流体中的燃烧特性
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793125701829
O. N. Fedyaeva, S. A. Semenova, S. A. Alekhin, A. P. Grebennikov, S. A. Lizunov
{"title":"Features of the Combustion of Coals in an Oxygen Atmosphere and Water–Oxygen Fluid at Elevated Pressure","authors":"O. N. Fedyaeva,&nbsp;S. A. Semenova,&nbsp;S. A. Alekhin,&nbsp;A. P. Grebennikov,&nbsp;S. A. Lizunov","doi":"10.1134/S1990793125701829","DOIUrl":"10.1134/S1990793125701829","url":null,"abstract":"<p>The paper studies the oxidation of coals with different degrees of coalification in an oxygen atmosphere and water–oxygen fluid (oxygen excess ratio 1.22–1.43) when heating the reactor at a constant rate (1 deg/min) to 550°C. From the time dependences of the temperature and pressure of the reaction mixtures, it follows that the addition of water to oxygen reduces the ignition temperature of coals and intensifies their combustion. This effect is most pronounced for coals with a high degree of coalification. At certain values of total heat release, the oxidation of coals in both the O<sub>2</sub> atmosphere and water–oxygen fluid (H<sub>2</sub>O–O<sub>2</sub> fluid) occurs by the thermal explosion mechanism. The influence of the composition of organic and mineral components of coals on their ability to ignite is discussed.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1669 - 1680"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kinetics of Hydragylite to Boehmite Transformation in Water and Water Vapor 水蛭石在水和水蒸气中向薄水铝石转变的动力学
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793126700193
Yu. D. Ivakin, A. A. Kholodkova, A. M. Zayaruzny, M. O. Volodko
{"title":"Kinetics of Hydragylite to Boehmite Transformation in Water and Water Vapor","authors":"Yu. D. Ivakin,&nbsp;A. A. Kholodkova,&nbsp;A. M. Zayaruzny,&nbsp;M. O. Volodko","doi":"10.1134/S1990793126700193","DOIUrl":"10.1134/S1990793126700193","url":null,"abstract":"<p>The kinetics of the isothermal transformation of hydrargillite with an average particle size of 3.5-μm into boehmite during autoclave treatment at 160–180°C in a liquid water and steam media has been studied. Samples of hydrargillite with and without the addition of boehmite previously obtained at 200°C have been used. It has been found that when boehmite is added to hydrargillite, the induction period decreases, while the rate of boehmite formation does not change. In water vapor, the induction period is sharply reduced, while the rate of boehmite formation increases compared to the rate in liquid water. A study of the morphology of the transformation products has shown that the formation and growth of boehmite crystals occurs on the surface of hydrargillite particles. The values of the activation energy of 89.3 ± 11.2 and 147.6 ± 11.4 kJ/mol have been determined from the temperature dependence of the rate constants of the isothermal boehmite formation in liquid water and steam, respectively. The mechanism of transformation of hydrargillite into boehmite has been discussed.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1781 - 1794"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Co-Hydrolysis of GeCl4 and Pr(NO3)3⋅5H2O in an Aprotic Solvent—A Way to Create Aerogels with Target Luminescent Characteristics 非质子溶剂中GeCl4与Pr(NO3)3⋅5H2O共水解制备具有靶发光特性的气凝胶
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793126700016
O. M. Gajtko, S. V. Golodukhina, V. O. Veselova, D. A. Khvoshchevskaya, S. Yu. Kottsov, A. A. Sadovnikov, A. G. Son
{"title":"Co-Hydrolysis of GeCl4 and Pr(NO3)3⋅5H2O in an Aprotic Solvent—A Way to Create Aerogels with Target Luminescent Characteristics","authors":"O. M. Gajtko,&nbsp;S. V. Golodukhina,&nbsp;V. O. Veselova,&nbsp;D. A. Khvoshchevskaya,&nbsp;S. Yu. Kottsov,&nbsp;A. A. Sadovnikov,&nbsp;A. G. Son","doi":"10.1134/S1990793126700016","DOIUrl":"10.1134/S1990793126700016","url":null,"abstract":"<p>In this paper, a straightforward method for creating crystalline GeO<sub>2</sub> : Pr<sup>3+</sup> aerogels has been proposed. By adapting an existing epoxide-induced synthesis process, we have successfully performed co-gelation of GeCl<sub>4</sub> and Pr(NO<sub>3</sub>)<sub>3</sub>·5H<sub>2</sub>O. It has been shown that the concentration of the dopant ion in the aerogel increases in direct proportion to its initial fraction in the mixture, with a uniform distribution throughout the material. The dependence of the photoluminescence of GeO<sub>2</sub> : Pr<sup>3+</sup> aerogels on the excitation wavelength has been established. At high excitation energies, the luminescence is completely determined by the germanium oxide matrix, while when excited by green light, the characteristic orange-red emission bands of Pr<sup>3+</sup> ions become the dominant.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1731 - 1742"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Description of the Solubility of Supercritical Fluid in Hydrocarbons over a Wide Range of Pressures and Temperatures 超临界流体在大范围压力和温度下在碳氢化合物中的溶解度描述
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793126700053
A. V. Radaev, A. N. Sabirzyanov, I. D. Zakiev
{"title":"Description of the Solubility of Supercritical Fluid in Hydrocarbons over a Wide Range of Pressures and Temperatures","authors":"A. V. Radaev,&nbsp;A. N. Sabirzyanov,&nbsp;I. D. Zakiev","doi":"10.1134/S1990793126700053","DOIUrl":"10.1134/S1990793126700053","url":null,"abstract":"<p>A method is proposed for describing the solubility of supercritical (SC) fluids in hydrocarbons using the empirical parameters determined by the error function minimization method. The solubility of supercritical CO<sub>2</sub> in cyclohexane and kerosene at 313 K and various pressures was calculated. The standard deviation of the data calculated by the proposed method from the experimental ones was no more than 8.2%.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1763 - 1766"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Catalytic Properties of Silica-Supported Monometallic and Palladium-Containing Bimetallic Catalysts in the Selective Hydrogenation of Acetylene 二氧化硅负载单金属和含钯双金属催化剂在乙炔选择性加氢中的催化性能
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2026-04-07 DOI: 10.1134/S1990793126700041
M. Yu. Sinev, P. R. Vasyutin, Yu. A. Gordienko, E. Yu. Lyubimov, M. A. Kurykin, M. O. Kostenko, Ya. I. Zuev
{"title":"Catalytic Properties of Silica-Supported Monometallic and Palladium-Containing Bimetallic Catalysts in the Selective Hydrogenation of Acetylene","authors":"M. Yu. Sinev,&nbsp;P. R. Vasyutin,&nbsp;Yu. A. Gordienko,&nbsp;E. Yu. Lyubimov,&nbsp;M. A. Kurykin,&nbsp;M. O. Kostenko,&nbsp;Ya. I. Zuev","doi":"10.1134/S1990793126700041","DOIUrl":"10.1134/S1990793126700041","url":null,"abstract":"<p>The kinetics of acetylene hydrogenation in the presence of supported catalysts containing transition metals (Fe, Co, Ni, Cu, Ag) and palladium has been studied. The catalysts have been synthesized by depositing palladium hexafluoroacetylacetonate from solution in a supercritical carbon dioxide medium onto a silicon-based support and subsequently subjecting the samples to heat treatment and reduction in a hydrogen stream at 500°C. The support has been preimpregnated with solutions of transition metal nitrates. The catalytic properties of bimetallic systems and monometallic systems containing the same components have been compared. It has been shown that palladium and the transition metal used affect the catalytic properties of each other. It has been found that the kinetics of formation of acetylene hydrogenation products (ethylene, methane) changes with an increase in temperature, and the changes are different in the presence of bimetallic catalysts containing Cu and Ag and the catalysts containing Fe, Co, and Ni. In the latter case, a minimum acetylene conversion rate is observed at a temperature of about 100°C, and the ethylene selectivity abruptly increases with a further increase in temperature. The observed relationships are interpreted in terms of the existence of various adsorbed species of reactants (hydrogen and unsaturated hydrocarbons), which differ in adsorption strength and reactivity, on the surface of complex multicomponent catalyst systems.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 8","pages":"1752 - 1762"},"PeriodicalIF":1.4,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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