| abstract |
[PROBLEMS] To improve the purification performance of exhaust gas components (HC, CO, particulates, etc.) and to improve the heat resistance thereof. In an exhaust gas component purification catalyst material containing activated alumina and a CeZr-based composite oxide, primary particles of CeZr-based composite oxide are dispersed and supported on the surface of secondary particles of activated alumina, and the CeZr The primary particles of the composite oxide contain CeO 2 at a ratio of 15 mol% to 60 mol%. [Selection] Figure 5 |