| 摘要 |
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 comprises Rh doped complex oxide in which a rare earth metal other than Ce, Zr, and Ce constitutes complex oxide and the complex oxide is doped with Rh, wherein as the rare earth metal, at least Nd is comprised, and the Nd is present in higher concentration at the surface part of the complex oxide than the inside thereof. |
