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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 28, Number 2
JKCSEZ 28(2)
April 20, 1984 

Kinetics and Mechanism of the Oxidation of Carbon Monoxide on ZnCe1+yO2

ZnCe1+yO2상에서 일산화탄소의 산화반응 메카니즘
Keu Hong Kim, Jae Shi Choi

김규홍, 최재시
ZnCe1+yO2상에서 CO산화반응 속도가 300 ~ 500℃ 영역에서 측정되었다. 산화반응 속도는 CO에 1차 O2에 0.5차를 나타내는 속도식에 따랐으며 격자점의 산소와 Zn 도프에 기인되어 생성된 Vo-2e' 결함이 CO 및 O2의 활성화 sites로 작용되었다. 전기전도도 데이타와 rate law로 부터 산화반응 메카니즘이 규명되었으며 율속과정이 제안되었다.

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.

102 - 108
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