COLLOIDAL PLATINUM CATALYSTS PREPARED BY HYDROGEN- AND PHOTO-REDUCTION IN THE PRESENCE OF SURFACTANT

Abstract

Abstract Chloroplatinic acid in an aqueous solution was reduced by hydrogen molecules or photo-irradiation in the presence of surfactants to produce colloidal dispersions of platinum protected by the surfactants. The particles of the colloidal platinum prepared by photo-reduction were smaller in size and more narrowly dispersed than those prepared by hydrogen-reduction. They worked as highly active catalysts for hydrogenation of olefins.