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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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.