| abstract |
The exhaust gas purifying catalyst of the present invention has the catalyst layer 40 formed inside the partition walls 16 of the wall flow structure substrate 10, and the catalyst layer 40 includes the upstream side catalyst layer 20 and the downstream side catalyst layer 30. The upstream-side catalyst layer 20 contains Rh and Ce-containing oxide, and the downstream-side catalyst layer 30 contains Pd and Ce-containing oxide. The mass of the catalyst layer 40 per unit volume of the substrate 10 is 105g/L to 210g/L, the mass of the upstream side catalyst layer 20 per unit volume of the upstream side portion 10A is 50g/L to 100g/L, the mass of the downstream side catalyst layer 30 per unit volume of the downstream side portion 10B is 100g/L to 150g/L, the Ce content per unit volume of the substrate 10 is 14g/L to 35g/L, and the Ce content per unit volume of the upstream side portion 10A is 5g/L to 20 g/L. |