M. O. Kostenko, Ya. I. Zuev, A. A. Ovechkina, M. A. Kurykin, O. O. Parenago
{"title":"六氟乙酸铜- co2 - al2o3体系的平衡","authors":"M. O. Kostenko, Ya. I. Zuev, A. A. Ovechkina, M. A. Kurykin, O. O. Parenago","doi":"10.1134/S1990793124030072","DOIUrl":null,"url":null,"abstract":"<p>The solubility of copper(II) hexafluoroacetylacetonate monohydrate Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O in carbon dioxide was studied. The solubility increases with increasing temperature in the range of 303–353 K and was observed to increase nonlinearly with increasing CO<sub>2</sub> density in the supercritical (SC) region. The dependence of the solubility on the parameters of state (temperature, CO<sub>2</sub> density) was described by the Chrastil equation. The adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O from a solution in SC-CO<sub>2</sub> on three γ-Al<sub>2</sub>O<sub>3</sub> samples differing in the presence of acidic and basic additives was investigated. The adsorption isotherms have a shape with a sharp increase in the adsorption value in the initial part, which indicates a high affinity of the complex for the surface of the substrate and/or its heterogeneity, as well as the presence of sites with high adsorption energy. An increase in the CO<sub>2</sub> density from 355 to 780 kg/m<sup>3</sup> at a constant temperature (313 K) leads to a decrease in the adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O on all three Al<sub>2</sub>O<sub>3</sub> samples. At a constant medium density of 355 kg/m<sup>3</sup> and an increase in temperature from 313 to 343 K, a more complex behavior of the adsorption isotherms is observed depending on the characteristics of the support and the concentration range of the adsorbed substance.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1939 - 1947"},"PeriodicalIF":1.4000,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Equilibria in the Copper Hexafluoroacetylacetonate–CO2–Al2O3 System1\",\"authors\":\"M. O. Kostenko, Ya. I. Zuev, A. A. Ovechkina, M. A. Kurykin, O. O. Parenago\",\"doi\":\"10.1134/S1990793124030072\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The solubility of copper(II) hexafluoroacetylacetonate monohydrate Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O in carbon dioxide was studied. The solubility increases with increasing temperature in the range of 303–353 K and was observed to increase nonlinearly with increasing CO<sub>2</sub> density in the supercritical (SC) region. The dependence of the solubility on the parameters of state (temperature, CO<sub>2</sub> density) was described by the Chrastil equation. The adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O from a solution in SC-CO<sub>2</sub> on three γ-Al<sub>2</sub>O<sub>3</sub> samples differing in the presence of acidic and basic additives was investigated. The adsorption isotherms have a shape with a sharp increase in the adsorption value in the initial part, which indicates a high affinity of the complex for the surface of the substrate and/or its heterogeneity, as well as the presence of sites with high adsorption energy. An increase in the CO<sub>2</sub> density from 355 to 780 kg/m<sup>3</sup> at a constant temperature (313 K) leads to a decrease in the adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O on all three Al<sub>2</sub>O<sub>3</sub> samples. At a constant medium density of 355 kg/m<sup>3</sup> and an increase in temperature from 313 to 343 K, a more complex behavior of the adsorption isotherms is observed depending on the characteristics of the support and the concentration range of the adsorbed substance.</p>\",\"PeriodicalId\":768,\"journal\":{\"name\":\"Russian Journal of Physical Chemistry B\",\"volume\":\"18 8\",\"pages\":\"1939 - 1947\"},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2025-03-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Russian Journal of Physical Chemistry B\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1990793124030072\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"PHYSICS, ATOMIC, MOLECULAR & CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Physical Chemistry B","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S1990793124030072","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, ATOMIC, MOLECULAR & CHEMICAL","Score":null,"Total":0}
Equilibria in the Copper Hexafluoroacetylacetonate–CO2–Al2O3 System1
The solubility of copper(II) hexafluoroacetylacetonate monohydrate Cu(hfa)2⋅H2O in carbon dioxide was studied. The solubility increases with increasing temperature in the range of 303–353 K and was observed to increase nonlinearly with increasing CO2 density in the supercritical (SC) region. The dependence of the solubility on the parameters of state (temperature, CO2 density) was described by the Chrastil equation. The adsorption of Cu(hfa)2⋅H2O from a solution in SC-CO2 on three γ-Al2O3 samples differing in the presence of acidic and basic additives was investigated. The adsorption isotherms have a shape with a sharp increase in the adsorption value in the initial part, which indicates a high affinity of the complex for the surface of the substrate and/or its heterogeneity, as well as the presence of sites with high adsorption energy. An increase in the CO2 density from 355 to 780 kg/m3 at a constant temperature (313 K) leads to a decrease in the adsorption of Cu(hfa)2⋅H2O on all three Al2O3 samples. At a constant medium density of 355 kg/m3 and an increase in temperature from 313 to 343 K, a more complex behavior of the adsorption isotherms is observed depending on the characteristics of the support and the concentration range of the adsorbed substance.
期刊介绍：
Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.
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