Influence of the simultaneous substitution of Cu and Ru in the perovskite-type (La,Sr)MO3 (M=Al, Mn, Fe, Co) on the catalytic activity for CO oxidation and CO-NO reactions
Y. Teraoka et al., Influence of the simultaneous substitution of Cu and Ru in the perovskite-type (La,Sr)MO3 (M=Al, Mn, Fe, Co) on the catalytic activity for CO oxidation and CO-NO reactions, APP CATAL A, 194, 2000, pp. 35-41
Catalytic activities of perovskite-type La0.8Sr0.2M1-2yIII CuyRuYO3 (M-III
= Al, Mn, Fe, Co) for CO oxidation and CO-NO reactions were changed signifi
cantly by simultaneous Cu/Ru substitution, depending on the host M-III cati
ons. Cu/Ru substitution caused the decrease of both activities (Co) and the
preferential promotion of activity for CO oxidation (Fe) or the GO-NO (Mn)
reaction. When the Cu/Ru pair was substituted in inert La0.8Sr0.2AlO3, the
catalytic activities for both reactions increased remarkably, and the resu
lting La0.8Sr0.2Al0.8Cu0.1Ru0.1O3 Showed activity comparable to Pt/Al2O3 an
d La0.8Sr0.2CoO3. It is inferred that Cu and Ru ions in the Al-based perovs
kite promote, respectively, the reduction step of the catalyst by CO and th
e oxidation step of this reduced catalyst by NO. (C) 2000 Elsevier Science
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