Equilibria in the Copper Hexafluoroacetylacetonate–CO2–Al2O3 System1

IF 1.4 4区化学 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI:10.1134/S1990793124030072

M. O. Kostenko, Ya. I. Zuev, A. A. Ovechkina, M. A. Kurykin, O. O. Parenago

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Abstract

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.

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六氟乙酸铜- co2 - al2o3体系的平衡

研究了六氟乙酰丙酮铜（II）一水合物Cu(hfa)2⋅H2O在二氧化碳中的溶解度。溶解度在303 ~ 353 K范围内随温度升高而升高，在超临界区随CO2浓度的增加呈非线性增加。溶解度与状态参数（温度、CO2密度）的关系由Chrastil方程描述。研究了不同酸性和碱性添加剂对SC-CO2溶液中Cu(hfa)2⋅H2O在不同γ-Al2O3样品上的吸附作用。吸附等温线在初始部分具有吸附值急剧增加的形状，这表明配合物对底物表面具有高亲和力和/或其非均质性，以及存在高吸附能的位点。在恒温（313 K）条件下，当CO2浓度从355 kg/m3增加到780 kg/m3时，三种Al2O3样品对Cu(hfa)2⋅H2O的吸附均有所减少。当介质密度为355 kg/m3，温度从313 K增加到343 K时，根据载体的特性和被吸附物质的浓度范围，观察到更复杂的吸附等温线行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Journal of Physical Chemistry B 化学-物理：原子、分子和化学物理

CiteScore

2.20

自引率

71.40%

发文量

106

审稿时长

4-8 weeks

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.