Russian Journal of Physical Chemistry A最新文献_第9页

Volumetric Properties of Aqueous Solutions of Sodium Metaborate from 283.15 to 323.15 K and 0.1 MPa 偏硼酸钠水溶液在283.15 ~ 323.15 K和0.1 MPa条件下的体积性质

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703229

Fengying Wang

引用次数: 0

Friedlander Reaction Catalyzed by Supported Ionic Liquid: An Economical and Environmentally Friendly Method 负载离子液体催化弗里德兰德反应：一种经济环保的方法

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703205

Yubing Tan, Jian Sun, Huajing Gao, Zhaohui Jin, Zijian Gao, Xianjun Yi, Hailun Ren

{"title":"Friedlander Reaction Catalyzed by Supported Ionic Liquid: An Economical and Environmentally Friendly Method","authors":"Yubing Tan, Jian Sun, Huajing Gao, Zhaohui Jin, Zijian Gao, Xianjun Yi, Hailun Ren","doi":"10.1134/S0036024424703205","DOIUrl":"10.1134/S0036024424703205","url":null,"abstract":"First, 1-butyl-2,3-dimethylimidazolium imidazolium salt ionic liquid was prepared, and then it was combined with methyl orthosilicate to prepare silica gel supported ionic liquid catalyst by non-hydrolytic sol-gel method. Its chemical structure was characterized by Fourier infrared spectroscopy, and its thermal performance, apparent morphology, and pore structure were tested by high-temperature synchronous thermal analyzer, scanning electron microscope, and specific surface area analyzer. Then, the catalytic effect of the catalyst on the Friedlander reaction was investigated in a Schlenk reaction flask, and the effects of reaction temperature, reaction time, and reactant molar ratio on product yield were investigated. The experimental results show that the supported ionic liquid catalyst has the highest product yield (92%) at a reaction temperature of 110°C, reaction time of 9 h, catalyst dosage of 0.1 g, and a molar ratio of 2-amino-3-pyridine formaldehyde to diphenyl ketone reaction raw materials of 1 : 0.4. The catalyst is reused for 4 times without significant activity loss.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 2","pages":"178 - 185"},"PeriodicalIF":0.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784093","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}

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Thermodynamics of Sorption and Tendencies in Retention of Haloadamantanes on the Cyclodextrin-Containing CYCLOBOND Sorbent under HPLC Conditions 高效液相色谱条件下含环糊精的 CYCLOBOND 吸附剂对卤代金刚烷的吸附热力学和保留趋势

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703333

S. N. Yashkin, A. V. Basilin, E. V. Ryzhikhina, D. A. Svetlov

{"title":"Thermodynamics of Sorption and Tendencies in Retention of Haloadamantanes on the Cyclodextrin-Containing CYCLOBOND Sorbent under HPLC Conditions","authors":"S. N. Yashkin, A. V. Basilin, E. V. Ryzhikhina, D. A. Svetlov","doi":"10.1134/S0036024424703333","DOIUrl":"10.1134/S0036024424703333","url":null,"abstract":"The thermodynamic characteristics of sorption (retention, heat, and entropy factors) of various chloro-, bromo- and iodoadamantanes from the water–methanol eluent on the octyl silica gel (SiO2-C8) and β-CD-octyl silica gel (CYCLOBOND) sorbents were determined experimentally for the first time under HPLC conditions. The sorption of haloadamantanes on the indicated sorbents occurs by different mechanisms: distribution on SiO2-C8 and macrocyclic mechanism on CYCLOBOND. The isomers of haloadamantanes on the studied sorbents differ in the order of retention under the same elution conditions. The CYCLOBOND sorbent showed high structural selectivity in the separation of positional isomers and stereoisomers of haloadamantanes. The separation factors of positional isomers increase with the van der Waals radii of halogen atoms. A hypothesis is formulated that haloadamantanes that can hardly form inner-spheric complexes with the β-CD fragments can form outer-spheric complexes with the exocyclic OH groups of β‑CD by the sorption mechanism, as in hydrophilic chromatography.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 2","pages":"300 - 307"},"PeriodicalIF":0.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784090","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

Conversion of Dimethyl Ether to Light Olefins on Rh–Mg/HZSM-5: The Role of Rhodium As a Modifier 铑改性剂在Rh-Mg /HZSM-5上二甲醚转化为轻烯烃的作用

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703187

M. I. Shilina, T. I. Batova, T. K. Obukhova, N. V. Kolesnichenko

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Physicochemical and Electrochemical Properties of Lithium Trifluoromethanesulfonate Solutions in Sulfolane Mixtures of 1.3-Dioxolane 三氟甲烷磺酸锂溶液在1.3-二恶氧烷混合砜中的物理化学和电化学性质

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703345

L. V. Sheina, E. V. Karaseva, A. N. Lobov, V. S. Kolosnitsyn

{"title":"Physicochemical and Electrochemical Properties of Lithium Trifluoromethanesulfonate Solutions in Sulfolane Mixtures of 1.3-Dioxolane","authors":"L. V. Sheina, E. V. Karaseva, A. N. Lobov, V. S. Kolosnitsyn","doi":"10.1134/S0036024424703345","DOIUrl":"10.1134/S0036024424703345","url":null,"abstract":"A study is performed of the physicochemical properties (specific ion conductivity, viscosity, and density) of 1.0M solutions of LiSO3CF3 in mixtures of sulfolane and 1.3-dioxolane in the 30–50°C range of temperatures. It is shown that the isotherms of specific ion conductivity pass through a maximum at contents of 1.3-dioxolane around 60 mol % (1.75 × 10−3 Ω−1 cm−1, 30°C). It is found that the viscosity and corrected (for viscosity) conductivity of the studied solutions fall as the content of 1.3-dioxolane and temperature rise. It is concluded that the activation energies of conductivity and viscous flow fall as the content of 1.3-dioxolane grows. NMR spectroscopy is used to estimate the self-diffusion coefficients of all components of the studied electrolyte solutions and calculate the transport numbers of lithium cations. It is been established that the transport numbers of lithium cations change nonlinearly, depending on the composition of the solution. The maximum value (0.56) is reached at a sulfolane : 1.3-dioxolane ratio of around 2 : 3, which correlates with the position of the maximum on the conductivity isotherm. It is shown that the melting points for 1.0 M solutions of LiSO3CF3 in mixtures of sulfolane and 1.3‑dioxolane fall as the content of the latter rises. It is noted that when the content of 1.3-dioxolane is more than 50 mol %, electrolyte solutions are in a liquid phase at temperatures below −70°C.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 2","pages":"308 - 317"},"PeriodicalIF":0.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0036024424703345.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Comparative Analysis of Chromatograph Mass Spectrometric Ways of Detecting Impurities in a Concentrated Hydrogen Peroxide–Rocket Fuel Oxidizer 浓过氧化氢-火箭燃料氧化剂中杂质色谱质谱检测方法的比较分析

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703321

Yu. V. Samukhina, A. N. Glushko, A. K. Buryak

引用次数: 0

Second Law and Current State of Thermodynamics 热力学第二定律与热力学现状

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-04-05 DOI: 10.1134/S0036024424703400

Yu. K. Tovbin

{"title":"Second Law and Current State of Thermodynamics","authors":"Yu. K. Tovbin","doi":"10.1134/S0036024424703400","DOIUrl":"10.1134/S0036024424703400","url":null,"abstract":"The current state of equilibrium thermodynamics is analyzed from the standpoint of using Clausius’s initial formulation of second law δS ≥ δQ/T in describing its four fields of application: the phase states of solids, the states of small systems (i.e., surfaces and disperse phases), and means of statistical physics and chemical kinetics in non-ideal systems. It is noted that the symbol ≥ simultaneously reflects both the tendency to reach equilibrium in a closed system and the ultimate state of equilibrium itself. The first two applications were formulated by Gibbs in the reduced form of the second law as equality δS = δQ/T. The same sign of equality is used in developing the third application. The development of the fourth application is based on the Gibbs chemical potential. Results from using the full formulation of Clausius’s second law in each of the above four applications are discussed. It is shown that differences between the times of relaxation of thermodynamic parameters, and the self-consistent descriptions of equilibrium and kinetics in molecular approaches, must be considered in order to calculate equilibrium characteristics correctly.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 2","pages":"363 - 374"},"PeriodicalIF":0.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784131","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

Heat Capacity Characteristics of the Solvation of Ammonium Ions in Mixed Solvent N-Methylpyrrolidone–Water at 298.15 K 298.15 K下n -甲基吡咯烷酮-水混合溶剂中铵离子的溶剂化热容特性

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702480

A. N. Novikov, E. I. Kostyleva, S. N. Solovyov

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Critical Wetting Point in a Liquid Lead–Molten Alkali Metal Halogenide System 液态铅-熔融碱金属卤化物体系的临界润湿点

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702662

V. P. Stepanov

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The Physicochemical Properties and Activity of Mn/γ-Al2O3 Catalysts in Propane Conversion to Olefin Hydrocarbons Mn/γ-Al2O3催化剂丙烷转化烯烃的理化性质及活性研究

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702571

A. A. Vosmerikov, A. A. Stepanov, L. N. Vosmerikova, E. Yu. Gerasimov, A. V. Vosmerikov

{"title":"The Physicochemical Properties and Activity of Mn/γ-Al2O3 Catalysts in Propane Conversion to Olefin Hydrocarbons","authors":"A. A. Vosmerikov, A. A. Stepanov, L. N. Vosmerikova, E. Yu. Gerasimov, A. V. Vosmerikov","doi":"10.1134/S0036024424702571","DOIUrl":"10.1134/S0036024424702571","url":null,"abstract":"The physicochemical and catalytic properties of manganese-modified γ-Al2O3 are described. Data on the acidic characteristics of the Mn-containing catalysts were obtained by the temperature-programmed desorption of ammonia; it has been found that the catalysts differ from each other in the distribution and ratio of acid sites of different types. The morphology and structure of Mn/γ-Al2O3 catalyst particles were studied by high-resolution transmission electron microscopy; it has been shown that modification of γ-Al2O3 with manganese does not lead to significant changes in these parameters. It has been found that in the propane conversion process at 650°C, the largest amount of olefin hydrocarbons of 37.8% is formed in the presence of γ-Al2O3 containing 4.0% of manganese at a conversion of 58%, while the lower olefin selectivity achieves 64.2%. The amount and nature of coke deposits formed on the surface of the Mn-containing catalysts during the propane dehydrogenation reaction are determined by differential thermal analysis. It has been shown that the formation of carbon nanofibers near the catalyst surface and the formation of graphite-like carbon layers on the surface of the Al2O3 particles occur during the reaction.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"44 - 52"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638415","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