PEROVSKITE-TYPE COMPOSITE OXIDE, CATALYST COMPOSITION AND METHOD FOR PRODUCING PEROVSKITE-TYPE COMP

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A perovskite-type composite oxide which is represented by the following general formula (1) : AxB(1-y)PdyO3+δ (1) [wherein A represents at least one element selected from among rare earth elements and alkaline earth metals, B represents at least one element selected from among transition elements (exclusive of rare earth elements and Pd), Al and Si, x represents an atomic ratio which is 1 < x, y represents an atomic ratio which is 0 < y <= 0.5, and δ represents a value corresponding to excessive oxygen]; a method for producing the above perovskite-type composite oxide which comprises treating raw materials based on the atomic ratios described in the above general formula; and a catalyst composition comprising the above perovskite-type composite oxide. The perovskite-type composite oxide has a high ratio of Pd being incorporated into the solid solution thereof, and also exhibits stable quality. © KIPO & WIPO 2007