| abstract |
(57) [Problem] A composite oxide powder having a large specific surface area and a pore volume even after high-temperature durability, and capable of suppressing grain growth of the noble metal after high-temperature durability even when a catalyst is carried by carrying a noble metal. I do. A Zr oxide and a metal M not forming a solid solution with the Zr oxide , And a Zr oxide and a metal M oxide are uniformly dispersed on a nm scale. Since different oxides act as barriers for each other, sintering is suppressed. The pores formed between the oxides are also fine mesopores on the nanometer scale, so that a high specific surface area and a high pore volume can be realized. |