Abstract
Heats of hydrogen adsorption over silica-supported platinum were measured calorimetrically as a function of dispersion. To measure the relatively small heats evolved, a sensitive calorimeter with a completely new type of detection system was constructed. The initial adsorption heats in three Q vs θ plots obtained decreased slightly with increasing dispersion. In all three plots local maxima corresponding to θ = 0.4 were observed. It was concluded that heats of adsorption are largely independent of dispersion. This is in agreement with the facile nature of most reactions over supported platinum.
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