Nanosized colloidal particles of platinum were obtained by reduction of H₂PtCl₆ in methanol – water mixtures by refluxing. The reduction time, molecular mass and concentration of polyvinylpirrolidone (PVPD) were widely varied. The sizes of obtained platinum particles were determined by electron microscopy. It was shown that in case of PVPD with MM= 12*10³ very small particles of metal are forming with practically equal sizes – 1-2 nm. With increasing of PVPD MM up to 24*10³ together with small particles rather big mellow spheric clusters (12, 18, 30 and 42 nm) consisting of small particles appear. Fraction of such big aggregates increases with increasing of polymer MM. Decreasing of polymer concentration supports aggregation process. Significant increasing of metal particles sizes was observed in case of reduction by methanol during many hours of refluxing. High catalytic activity of obtained colloidal platinum in hydrogenization of unsaturated compounds and in hydro-conversion processes of n- alkanes was shown. Possibility of remarkable decreasing of platinum content in supported catalysts by using colloidal platinum, stabilized by PVPD was demonstrated.

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1. Nanosized Pt and Pd containing catalysts immobilised on pillared montmorillonite in n-hexane isomerisation