| abstract |
In a stack type exhaust gas purification catalyst containing a NOx occlusion material, the NOx occlusion material is prevented from adversely affecting other catalyst components such as zeolite, and separation of a catalyst layer on a carrier is prevented, and exhaust gas is prevented. The gas diffusion is improved so that the catalyst performance can be sufficiently exhibited. In an exhaust gas purifying catalyst, an oxidation catalyst layer 2 containing zeolite, alumina, a Ce-containing oxide and a catalytic metal is formed on the upstream side in the exhaust gas flow direction on the carrier 1, and the exhaust gas flow direction on the carrier 1 An LNT layer 3 containing NOx storage material, alumina, Ce-containing oxide and catalyst metal is formed on the downstream side, and the average particle diameter of the zeolite in the oxidation catalyst layer 2 is a mixture of alumina and Ce-containing oxide in the LNT layer 3 Smaller than the average particle size. [Selection] Figure 2 |