Reaction kinetics of methane oxidation over LaCr{sub 1-x}Ni{sub x}O{sub 3} perovskite catalysts
- Univ. of Toronto, Ontario (Canada)
- Univ. of Houston, TX (United States); and others
Ternary perovskite oxides LaCr{sub 1-x}Ni{sub x}O{sub 3}, (x = 0 to 1.0) were evaluated as methane oxidation catalysts over the temperature range 300-500{degrees}C and as a function of the partial pressures of oxygen and methane (12-90 kPa). All catalysts are stable in oxygen containing atmospheres, while oxygen starvation causes destructive reduction to Ni metal for x > 0.5. The catalytic activity increases monotonically with the value of x. The nonseparable (composition, temperature) kinetics behavior is well correlated by an oxidation-reduction mechanism for all catalysts. Based on the observed nonlinear increase in catalytic activity with nickel content, Ni-O-Ni ensembles are proposed as the key surface reagent. 52 refs., 6 figs., 2 tabs.
- OSTI ID:
- 478771
- Journal Information:
- Journal of Catalysis, Vol. 166, Issue 2; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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