Catalytic Oxidation of Carbon Monoxide on Pt and SnO2

[摘要] Oxidation reactions of carbon monoxide on SnO2, Sb-doped SnO2, and Pt catalyst were studied. The oxidation reaction was found to be first order with respect to both CO and O2 on SnO2 and Sb-doped SnO2 catalysts, and to be of half order on Pt catalyst. A small addition of Sb to SnO2 (depant composition: 0.05¡­0.1 mol %) increased the rate of oxidation. On the contrary, a large addition decreased the rate. From the rate expression of oxidation on Pt catalyst, the inhibition effect of carbon monoxide on the rate of oxidation was deduced. The experimentally obtained activatio energies were 5.7 kcal for the Sb doped SnO2 catalyst (dopant composion: 0.05 mole%), and 6.4 kcal for the Pt catalyst. A possible reaction mechanism was proposed from the experimentally obtained kinetic data.

[学科分类] 化学（综合）