CATALYST FOR EXHAUST GAS CLEAN-UP

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Disclosed is a catalyst for use in the exhaust gas clean-up, which comprises a composite oxide catalyst and a heat-resistant carrier and is less likely to be reduced in activity even when used in a high-temperature, high-oxygen-level atmosphere. The catalyst comprises a composite oxide catalyst and a heat-resistant carrier supporting the composite oxide catalyst thereon. The composite oxide catalyst comprises a rare earth element, an alkali earth element and a noble metal, wherein a part of the rare earth element and a part of the alkali earth element together form a composite oxide and the composite oxide and a part of the noble metal together form a solid solution. The heat-resistant carrier comprises at least one composite oxide selected from the group consisting of a first composite oxide represented by the general formula : AB2O4, a second composite oxide having a perobskite structure and represented by the general formula : LMO3, and a third composite oxide having a pyrochlore structure and represented by the general formula : X2Y2O7.