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.
The kinetics and equilibrium of adsorption of hexachloroplatinic acid on activated carbon was studied. The time course of saturation by chloroplatinic acid dissolved in water and in acetone, respectively, was examined on three types of activated carbon with different texture parameters. The effect of the support properties on the shape of the adsorption isotherm for the acid in solution was also investigated.
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