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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 8, Number 5
May 20, 1987 

Kinetics and Mechanism of the Oxidation of Carbon Monoxide on CoO-α-Fe2O3 Catalysts
Keu Hong Kim*, Jae Shi Choi, Young Bae Kim
The oxidation of carbon monoxide by gaseous oxygen on 0.53, 1.02, and 1.51 mol % CoO-doped -Fe2O3 catalysts has been investigated in the temperature range from 340 to 480℃ under various CO and O2 partial pressures. The oxidation rates have been correlated with 1.5-order kinetics; the 0.5-order with respect to O2 and the first-order with respect to CO. In the above temperature range, the activation energy is 0.34 ± 0.01 eV· mol-1. The electrical conductivity of 0.53, 1.02, and 1.51 mol % CoO-doped α-Fe2O3 has been measured at 350℃ under various PCO and PO2. From the conductivity data it was found that O2 was adsorbed on Vo formed by doping with CoO, while CO appeared essentially to be chemisorbed on the lattice oxygen of the catalyst surface. The proposed oxidation mechanism and the dominant defect were supported by the agreement between the kinetic data and conductivities.
389 - 393
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