DETERMINATION OF THE DISPERSITY OF SUPPORTED PLATINUM CATALYSTS BY HYDROGEN, OXYGEN OR CARBON-MONOXIDE CHEMISORPTION AND HYDROGEN-OXYGEN TITRATIONS, USING VOLUMETRIC, GRAVIMETRIC AND CATHAROMETRIC TECHNIQUES

The dispersity of supported Pt catalysts is measured with better exactness by means of O2 (one atom O per surface Pt atom, Pts), or CO (one CO molecule per Pts) chemisorption; among the three techniques, the volumetric one is the most sensitive. But H2 chemisorption and H2-O2 titrations have to be used additionally in the case of thermally sensitive catalysts and if the support is not completely inert towards H2 at 400-500 °C. © 1979 Akadémiai Kiadó.