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Surface Characterization of Manganese Oxide Catalyst

The catalytic activity of manganese oxide catalysts in the temperature range of 200—700° has been studied with the aid of the hydrogen peroxide decomposition reaction. The texture of the catalysts was identified by N2 adsorption, X-ray analysis, as well as T.G.A. The nonstoichiometry was measured by the hydrazine method. A linear relationship is obtained between the amount of surface excess oxygen and the catalytic activity, on which basis a mechanism is suggested for the reaction. Introduction The decomposition of H2O2 has been extensivly studied on various oxides1-2 in order to elucidate the catalytic activity as well as the mechanism of that reaction. Nonstoichiometric manganese oxide has found more attention in the field of catalysis such as oxidation of GO 3, thermal decomposition of Perchlorate4, in addition to several petrochemical organic reactions5. A very limited discussion has been devoted to the study of the correlation between nonstoichiometric nature of manganese oxide and its catalytic activity. The present investigation deals with these correlative studies, T.G.A., X-ray diffraction, surface area measurements, quantitative analysis for the surface excess oxygen and finally kinetic runs on the decomposition 0ÎH2O2. Experimental The catalyst was obtained by the calcination of manganous nitrate in air at different temperatures for 5 hours. After cooling the oxide catalysts were preserved for use.