Kinetics and Mechanism of the Oxidation of Carbon Monoxide on $ZnCe_{1+y}O_2$

$ZnCe_{1+y}O_2$상에서 일산화탄소의 산화반응 메카니즘

  • 김규홍 (연세대학교 이과대학 화학과) ;
  • 최재시 (연세대학교 이과대학 화학과)
  • Published : 1984.04.20


The catalytic oxidation of CO has been investigated on $ZnCe_{1+y}O_2$ at temperatures from 300 to $500^{\circ}C$ under various P_{CO} and PO_2 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 $ZnCe_{1+y}O_2$ as a molecular species, while $O_2$ 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 $O_2$ withdraws it from an O vacancy. The oxidation mechanism and the defect model of $ZnCe_{1+y}O_2$ are inferred at given temperature and $PO_2'$s from the agreement between the conductivities and kinetic data. It is suggested that CO absorption is the rate-controlling.



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