Catalytic properties of perovskite-type mixed oxides (ABO3) consisting of rare earth and 3d transition metals. The roles of the A- and B-site ions.
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概要
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The catalytic activities of perovskite-type mixed oxides (LnBO<SUB>3</SUB> and Ln<SUB>0.8</SUB>Sr<SUB>0.2</SUB>CoO<SUB>3</SUB>, Ln=rare-earth (lanthanoid) elements, B=3d transition metals) for the oxidation of propane and methanol have been studied comparatively. It has been found that the catalytic activities of LnBO<SUB>3</SUB> were principally determined by the B-site elements and were similar to those of the corresponding oxides of the B-site elements. The roles of the rare-earth ions of the A-site were secondary as long as they were trivalent. Upon the partial replacement of Ln<SUP>3+</SUP> by Sr<SUP>2+</SUP>, the catalytic activities of LnCoO<SUB>3</SUB> increased several times, the magnitude of the increase being similar among all the rare-earth ions. These results demonstrate that the kind and the valence of a B-site metal are of primary importance for the control of the catalytic activity for oxidation, almost regardless of the kind of trivalent rare-earth elements at the A-site.
- 公益社団法人 日本化学会の論文
著者
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Misono Makoto
Department Of Applied Chemistry Faculty Of Engineering The University Of Tokyo
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Ichiki Tatsumi
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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Nitadori Taihei
Central Research Institute, Japan Tobacco, Inc.
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