CATALYST FOR PURIFICATION OF EXHAUST GAS

摘要

Disclosed is a catalyst for purifying an exhaust gas, which can retain excellent catalytic performance even when the catalyst is exposed to an exhaust gas having a temperature as high as 800°C or higher. Specifically disclosed is a catalyst for purifying an exhaust gas, which comprises a catalytically active component comprising a noble metal, an auxiliary catalytic component comprising an oxygen storage material, and a carrier, wherein the catalytically active component and the auxiliary catalytic component are supported on the carrier. The oxygen storage material comprises cerium, zirconium and iron, and the content of iron in the oxygen storage material is not less than 0.01% by mass and less than 0.70% by mass (in terms of Fe 2 O 3 content) relative to the total mass of the oxygen storage material. The oxygen storage material is (a) a composite oxide or a solid solution of iron and a metal component comprising cerium and zirconium, or (b) a material comprising a composite oxide or a solid solution of a metal component comprising cerium and zirconium and iron supported on the surface of the composite oxide or the solid solution.