EXHAUST GAS PURIFYING CATALYST

摘要

To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a noble metal. Proposed is an exhaust gas purifying catalyst which comprises: a first catalyst layer that is formed on the surface of a base that is formed of a ceramic or a metal; and a second catalyst layer that is formed on top of the first catalyst layer. The first catalyst layer contains a noble metal, while containing an OSC material and alumina at a mass ratio of from 1:7 to 1:3. The second catalyst layer contains a noble metal, while containing an OSC material and alumina at a mass ratio of from 1:1 to 10:0.