Abstract
This paper describes the determination of the metal dispersity of a catalyst by chemical adsorption using a thermogravimetric technique. The metal dispersity of two Ir/Al 2O 3 catalysts for hydrazine decomposition was determined by adsorption measurement using CO as adsorbate and a thermobalance. The results are not exactly identical with those determined by a chromatographic method but they are of the same magnitude and, moreover, the effect of reducing temperature on dispersity is the same in either case. Thus, it is feasible to determine the metal dispersity by thermogravimetry. The effects of the content of active component, Ir, of the reducing temperature and of the environmental atmosphere on the metal dispersity were also investigated.
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