Exhaust gas purification catalyst for internal combustion engine comprises metal support, undercoat layer containing heat-resistant inorganic oxide and oxygen occlusion substance and catalyst carrying layer

摘要

An exhaust gas purification catalyst comprises a metal support (L1) over which an undercoat layer (L2), and a catalyst carrier layer (L3) are provided. The undercoat layer contains a heat-resistant inorganic oxide and an oxygen occlusion substance such as ceria or complex oxide of cerium and zirconium.