Exhaust gas purification catalyst

Abstract

Provided is an exhaust gas purification catalyst that includes a base material containing a silicon-silicon carbide composite material and a catalyst layer containing a barium component and that has excellent high-temperature durability of oxygen storage capacity. The exhaust gas purification catalyst disclosed here includes a base material and a catalyst layer in contact with the base material. The base material contains a silicon-silicon carbide composite material. The catalyst layer contains a platinum-group catalyst, a barium component, and an oxygen storage material. The barium component is one material selected from the group consisting of barium and a barium compound. The barium component is present on at least a surface of the oxygen storage material. The barium component has an average particle size of 100 nm or more and 350 nm or less.

Dependencies are inferred from the claim text.