Physicochemical properties of LaFeO3. Kinetics of reduction and of oxygen adsorption
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 81 (10) , 2399-2407
- https://doi.org/10.1039/f19858102399
Abstract
The reduction with hydrogen of LaFeO3 and the kinetics of oxygen adsorption on this perovskite have been studied. The results of temperature-programmed reduction suggest that the starting sample was reduced first to nearly stoichiometric LaFeO3(600–850 K) and then to α-Fe and La2O3(850–1250 K). The reduction process at 1063–1163 K is controlled by formation and growth of nuclei of metallic iron. The kinetic data for reduction fit the Avrami–Erofeev equation. The kinetic data for oxygen adsorption fit the Elovich equation using t0 values as calculated by the method of Aharoni and Ungarish. Activation energies for reduction and for oxygen adsorption were 194 and 16 kJ mol–1, respectively. Oxygen adsorption was very low in comparison with other LaMO3 oxides, as would be expected from its low catalytic activity for total oxidation.Keywords
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