| abstract |
PROBLEM TO BE SOLVED: To provide an inorganic oxide in which grain growth of a supported metal (rhodium or the like) is sufficiently suppressed, an exhaust purification catalyst carrier comprising the same, and an exhaust purification catalyst using the same. An aluminum oxide, a metal oxide that does not form a composite oxide of aluminum oxide, and an additive element composed of at least one of a rare earth element and an alkaline earth element, and primary particles are aggregated. A particulate inorganic oxide containing secondary particles to be formed, wherein at least a part of the secondary particles includes a plurality of first primary particles having a particle diameter of 100 nm or less containing aluminum oxide and an additive element, and metal A plurality of second primary particles having a particle size of 100 nm or less containing an oxide and an additive element are aggregated, and at least a part of the first and second primary particles is added in the surface layer portion. An inorganic oxide having a surface enriched region in which the element content is locally increased. [Selection] Figure 1 |