M. O. Kostenko, Ya. I. Zuev, K. S. Novikov, O. O. Parenago
{"title":"Adsorption Deposition of Palladium Hexafluoroacetylacetonate on Porous Matrices in Supercritical CO2","authors":"M. O. Kostenko, Ya. I. Zuev, K. S. Novikov, O. O. Parenago","doi":"10.1134/S199079312470132X","DOIUrl":null,"url":null,"abstract":"<p>The adsorption deposition of palladium hexafluoroacetylacetonate Pd(hfa)<sub>2</sub> on porous supports (γ-Al<sub>2</sub>O<sub>3</sub> and hypercrosslinked polystyrene, HCP) in supercritical CO<sub>2</sub> is considered. The conditions for a transition of the Pd(hfa)<sub>2</sub>/CO<sub>2</sub> system to a monophase region have been studied. Due to its reasonably high solubility in CO<sub>2</sub>, the palladium compound can be deposited at relatively low pressures (~8.5 MPa) in the system. The adsorption of Pd(hfa)<sub>2</sub> on the given supports is well described by the Langmuir equation. An increase in the pressure in the system under isothermal conditions negatively affects the amount of adsorbed precursor because of the adsorption of CO<sub>2</sub> and distribution offset in the system. The limiting adsorption increases at elevated temperatures in the system under isochoric conditions.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1775 - 1784"},"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/S199079312470132X","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}
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Abstract
The adsorption deposition of palladium hexafluoroacetylacetonate Pd(hfa)2 on porous supports (γ-Al2O3 and hypercrosslinked polystyrene, HCP) in supercritical CO2 is considered. The conditions for a transition of the Pd(hfa)2/CO2 system to a monophase region have been studied. Due to its reasonably high solubility in CO2, the palladium compound can be deposited at relatively low pressures (~8.5 MPa) in the system. The adsorption of Pd(hfa)2 on the given supports is well described by the Langmuir equation. An increase in the pressure in the system under isothermal conditions negatively affects the amount of adsorbed precursor because of the adsorption of CO2 and distribution offset in the system. The limiting adsorption increases at elevated temperatures in the system under isochoric conditions.
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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