IRON OXIDE-ZIRCONIA COMPOSITE OXIDE AND METHOD FOR PRODUCING THE SAME

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PROBLEM TO BE SOLVED : To provide a composite oxide having high oxygen storage performance without using cerium. SOLUTION : A composite oxide contains iron, zirconium and a rare earth element, the composite oxide being characterized in that : the total content of Fe2O3, ZrO2 and an oxide of the rare earth element is 90 mass% or more; the content of iron oxide is 10 to 90 mass% in terms of Fe2O3; and the absolute value of a co-dispersed COV is 20 or less, which is determined in accordance with equations (1) to (3) after the composite oxide is burned in the atmosphere at a temperature of 900°C or higher. COPYRIGHT : (C)2014, JPO&INPIT