The oxidation of carbon monoxide by gaseous oxygen in the presence of a powdered Cd-doped La2O3 catalyst has been investigated in the temperature range from 300 to 450 °C under various CO and O2 partial pressures. The conductivity of Cd-doped La2O3 has been measured at 450 °C under various CO and O2 pressures. The oxidation rates have been correlated with 1.5-order kinetics; the first-order with respect to CO and the 0.5-order with respect to O2. For the above temperature range, the activation energy is around 11.3 kcal · mol-1. CO appears essentially to be chemisorbed on the lattice oxygens of the Cd-doped La2O3, while O2 adsorbs as ions on the oxygen vacancies induced by Cd-doping. The agreement between the kinetic data and conductivities supports the proposed oxidation mechanism and the dominant defect of Cd-doped La2O3.
Bibliographical noteFunding Information:
We are grateful to the Ministry of Education of Korea for financial support and to Dr. Young Hwan Kang and Professor Ki Hyun Yoon for helpful discussions.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry