| abstract |
[PROBLEMS] To provide a catalytic converter excellent in OSC performance and NOx purification performance. A catalytic converter 10 includes a base material 1 having a cell structure and a catalyst layer 3 formed on a cell wall surface of the base material 1. The upstream catalyst layer 4 is arranged on the upstream side, and the downstream catalyst layer 5 is arranged on the downstream side in the exhaust gas flow direction. The upstream catalyst layer 4 is made of Al 2 O 3 −. A support containing CeO 2 -ZrO 2 ternary composite oxide (ACZ material) and Al 2 O 3 -ZrO 2 binary composite oxide (AZ material), and at least a noble metal catalyst supported on the support The downstream catalyst layer 5 is formed from a carrier and Pd or Pt which is a noble metal catalyst supported on the carrier, and the upstream catalyst layer 4 supports the ACZ material / (ACZ material + AZ). ranges mass ratio of 0.33 to 0.5 of the wood), the upstream catalyst layer 4, Al 2 O 3 -ZrO 2 binary over 75 wt% of Rh is the carrier It is supported on the case the oxide. [Selection] Figure 3 |