COMPLEX OXIDE PARTICLES AND CATALYST FOR PURIFYING EXHAUST GAS USING SAME

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Provided are : complex oxide particles as a carrier which is capable of imparting high heat resistance and oxygen storage capacity to a catalyst; and a catalyst for purifying automobile exhaust gas. The present invention relates to complex oxide particles which comprise a ceria-zirconia complex oxide, alumina and yttria and at least one type of oxide of an element selected from rare earth elements other than cerium and yttrium and alkaline earth metals, wherein the alumina content with respect to the complex oxide particles is 70 to 89 mass% and the yttria content with respect to the ceria-zirconia complex oxide is 0.01 to 0.22 mol%.