Preparation and immobilization of polymer-protected bimetallic colloids

Abstract

Co-reduction of mixed metal ions of platinum-rhodium or rhodium-gold by refluxing its alcohol ic solution in presence of a protective polymer results in a corresponding stable bimetallic sol, which in turn interacts with a suspension of silica gel, bearing thioether ligand, to give supported bimetallic catalysts. The TEM and XRD measurements indicate the formation of the bimetallic alloy clusters. The sols are used as catalysts for the selective partial hydrogenation of cis, cis-1.5-cyclooctadiene to cyclooctene. The bimetallic sol catalyst PVP-Pt-Rh shows an activity which is about twice as that of the monometallic sol PVP-Rh.