Collect. Czech. Chem. Commun. 1981, 46, 3270-3277

Relation between the distribution of platinum, its dispersion, and activity of catalysts prepared by impregnation of activated carbon with chloroplatinic acid solutions

Vladimír Macheka, Jiří Hanikaa, Karel Sporkaa, Vlastimil Růžičkaa and Jiří Kunzb

a Department of Organic Technology, Prague Institute of Chemical Technology, 166 28 Prague 6
b Department of Materials, Faculty of Nuclear and Physical Engineering, Czech Technical University, 110 00 Prague 1


The effect was studied of the solvent of chloroplatinic acid used for impregnation of activated carbon on the distribution and dispersion of platinum and on the catalyst activity. Using different solvents, catalysts were prepared exhibiting either surface platinum distribution (water) or its uniform distribution (ketones). Catalysts with uniform platinum distribution displayed a better stability of the platinum dispersity against sintering. The catalyst activities in liquid phase hydrogenation of 1-octene and of nitrobenzene were related to the platinum dispersity; the results suggest that the hydrogenations of the two substrates are governed by different mechanisms.