| 简介 |
PROBLEM TO BE SOLVED : To improve the activity and high-temperature durability of a catalyst material for exhaust gas purification composed of Rh doped complex oxide.
SOLUTION : A catalyst material for exhaust gas purification is composed of Rh doped complex oxide that comprises a rare earth metal other than Ce and Zr but does not comprise Ce, wherein as the rare earth metal, at least La and Y are comprised, and at least one of La and Y is present in higher concentration at the surface part of the complex oxide than the inside thereof.
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