ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 27, Number 3
JKCSEZ 27(3)
June 20, 1983 

The catalytic oxidation of SO2 has been investigated in the presence of vacuum-activated 10 mol % Ni-doped α-Fe2O3 under various partial pressures of SO2 and O2 at temperatures from 320 to 440℃. Over the temperature range 320∼440℃, the activation energy is 13.8 kcal·mol-1. The oxidation rates have been correlated with 1.5 order kinetics; first order with respect to SO2 and 0.5 order with respect to O2. From the kinetic data and conductivity measurements, the adsorption, oxidation mechanism of SO2 and the defect structure of vacuum-activated 10 mol % Ni-doped α-Fe2O3 are suggested. O2 and SO2 appear to be adsorbed essentially as ionic species. Two surface sites, probably an O2- lattice and an oxygen vacancy which is induced by Ni-doping, might be required to adsorb SO2and O2. The conductivity measurements and kinetic data indicate that the adsorption process of SO2 (SO2 ＋ O2-(latt) ↔ SO3-(ads) ＋ e') is the rate-determining step.