Journal of the Chemical Society - Faraday Transactions p. 91 - 96 (1992)
Update date:2022-08-17
Topics:
Mizuno, Noritaka
Tanaka, Mika
Misono, Makoto
Catalytic reactions between CO and NO and between CO and O2 over several perovskite-type mixed oxides, such as LaMO3 and La(1-x)Sr(x)MO3 (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 < Mn < Fe < Co > Ni and that for CO-O2 was Cr < Mn > Fe < Co > 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 Sr(2+) 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 > La(0.9)Sr(0.1)FeO3 > LaCoO3 > LaMnO3.The transformation of N2O to N2 over LaFeO3 and La(0.9) Sr(0.1)FeO3 in the CO-NO reaction is due to the greater rates for the CO-N2O reaction.
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