Abstract
Catalytic reactions between CO and NO and between CO and O2 over several perovskite-type mixed oxides, such as LaMO3 and La1–xSrxMO3(M = Co, Fe, Mn, Cr, Ni; x= 0–0.4), have been studied in a recirculation system at 473 and 573–673 K, respectively. It has been found that the catalytic activities for the two reactions depend on the B-site element in distinctly different ways; the activity pattern for CO–NO was Cr Ni and that for CO–O2 was Cr Fe Ni. It was suggested that the difference of the activity pattern was due to the ability of the B-site ion to activate NO and O2, based on the results of NO adsorption and the activity patterns reported for other oxidation reactions. The substitution of Sr2+ for the A site in ABO3(A = La, B = Co, Mn, Fe) decreased monotonically the catalytic activity for the CO–NO reaction in contrast to the increase observed previously for the oxidation of propane. The order of the rate of CO–N2O reaction was LaFeO3 > La0.9Sr0.1FeO3 > LaCoO3 > LaMnO3. The transformation of N2O to N2 over LaFeO3 and La0.9Sr0.1FeO3 in the CO–NO reaction is due to the greater rates for the CO–N2O reaction.
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