Abstract
The effects of catalysts on the kinetics of the thermal reaction of graphite with air are described. Catalysts are impurities initially present in natural or artificial graphites, which accumulate on the surface during burn off, and impurities deliberately introduced to obtain positive (K, Na) or negative (P 2O 5) catalysis. Catalysts affect the reaction rate, the CO CO 2 ratio, the activation energy and the pre-exponential factor of the Arrhenius equation, and correlations have been found between these kinetic parameters which, on the other hand, have practically the same values for the purest graphites. The results are explained by the coexistence of two independent reactions, uncatalyzed and catalyzed, occuring respectively on the clean and the contaminated fractions of the surface.
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