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KMID : 1059519840280020102
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Journal of the Korean Chemical Society
1984 Volume.28 No. 2 p.102 ~ p.108
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Kinetics and Mechanism of the Oxidation of Carbon Monoxide on ZnCe1+yO2
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Kim Keu-Hong
Choi Jae-Shi
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Abstract
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The catalytic oxidation of CO has been investigated on ZnCe1+yO2 at temperatures from 300 to 500℃ under various PCO and PO2 conditions. The oxidation rates have been correlated with 1.5-order kinetics: first order with respect to CO and 0.5 order with respect to O2. CO appears to be absorbed essentially on the O lattice of ZnCe1+yO2 as a molecular species, while O2 adsorbs on an O vacancy as an ionic species. The conductivity data show that CO adsorption contributes electron to the conduction band and the adsorption process of O2 withdraws it from an O vacancy. The oxidation mechanism and the defect model of ZnCe1+yO2 are inferred at given temperature and PO2's from the agreement between the conductivities and kinetic data. It is suggested that CO absorption is the rate-controlling.
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KEYWORD
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