Catalytic converter

A catalytic converter comprising:

• a substrate with a cell structure through which exhaust gas flows;
• and
• a catalyst layer formed on a cell wall surface of the substrate,
• wherein:
• the catalyst layer has a catalyst layer on an upstream side arranged on the upstream side in an exhaust gas flow direction on the substrate, and a catalyst layer on a downstream side arranged on the downstream side in the exhaust gas flow direction on the substrate,
• the catalyst layer on the upstream side includes a support containing an Al2O3—CeO2—ZrO2 ternary composite oxide and an Al2O3—ZrO2 binary composite oxide, and at least Rh that is a noble metal catalyst carried on the support,
• the catalyst layer on the downstream side includes a support, and Pd or Pt that is a noble metal catalyst carried on the support,
• in the support in the catalyst layer on the upstream side, a mass proportion of the Al2O3—CeO2—ZrO2 ternary composite oxide/(the Al2O3—CeO2—ZrO2 ternary composite oxide+the Al2O3—ZrO2 binary composite oxide) is in a range of 0.33 to 0.5, and
• in the catalyst layer on the upstream side, greater than or equal to 75 mass % Rh is carried on the Al2O3—ZrO2 binary composite oxide of the support.