Patent ID: 6881384
Filing Date: 2005-04-19
Classification: B01D,B01J,Y02T

Abstract:
1. A catalytic converter for cleaning exhaust gas comprising: a heat-resistant support; and a catalytic coating formed on the heat-resistant support; wherein the catalytic coating includes a first coating layer formed on the heat-resistant support and a second layer formed on the first layer; wherein the first coating of the catalytic coating contains zirconium complex oxide on which Pt and Rh are coexistently carried, and cerium complex oxide on which Pt and Rh are coexistently carried; wherein the second coating of the catalytic coating contains Pd-carrying alumina or Pd-carrying cerium complex oxide; wherein the zirconium complex oxide is represented by the following general formula: in the formula (1), N represents an element selected from the group consisting of an alkaline earth metal and a rare earth element other than Ce and Zr, c represents the degree of oxygen deficiency determined by the valence and proportion of the contained element N, 0.65≦1−(a+b)≦0.9, 0.1≦a≦0.35, and 0≦b≦0.2; and wherein the cerium complex oxide is represented by the following general formula: in the formula (2), M represents an element selected from the group consisting of an alkaline earth metal and a rare earth element other than Ce and Zr, z represents the degree of oxygen deficiency determined by the valence and proportion of the contained element M, 0.35≦1−(x+y)≦0.80, 0.20≦x≦0.65, and 0≦y≦0.2.