| abstract |
[PROBLEMS] To provide a catalytic converter excellent in OSC performance and NOx purification performance. SOLUTION: A catalytic converter 10 comprising a base material 1 having a cell structure and a catalyst layer 3, wherein the catalyst layer 3 comprises a lower catalyst layer 4 and an upper catalyst layer 5, the upper catalyst layer 5 carries rhodium, zirconia, oxidation A zirconia compound carrier composed of lanthanum and yttrium oxide, an alumina compound composed of alumina and lanthanum oxide not supported by rhodium, and a ceria-zirconia composite oxide composed of ceria, zirconia, lanthanum oxide and neodymium oxide, The lower catalyst layer 4 is supported by platinum, is made of the same material as the alumina compound of the upper catalyst layer 5, and is composed of an alumina compound carrier made of alumina and lanthanum oxide, and platinum is not supported, and the upper catalyst layer 5 This is the same material as the ceria-zirconia-based composite oxide, and is made of ceria, zirconia, lanthanum oxide and neodymium oxide. - catalytic converters 10 consisting of the zirconia composite oxide. [Selection] Figure 3 |