Formation of Metal–Hypercrosslinked Polystyrene Composites in a Supercritical Carbon Dioxide Medium and Their Catalytic Properties in the Hydrogenation of Diphenylacetylene

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Abstract
Metal–hypercrosslinked polystyrene (HCP) composites active in the hydrogenation of unsaturated hydrocarbons are obtained by impregnation of HCP with palladium and rhodium compounds in a supercritical carbon dioxide (SC-CO2) medium followed by their reduction to the metallic state with molecular hydrogen. The influence of the conditions of preparation of the composites on their activity and selectivity in the hydrogenation of diphenylacetylene (DPA) is evaluated. The adsorption of palladium hexafluoroacetylacetonate on HCP from an SC-CO2 medium is studied for the first time using supercritical fluid chromatography; it is shown that the adsorption equilibrium is described by the Langmuir equation.

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