Patent ID: 7943104

Claim:
A method for reducing a concentration of at least one contaminant in an exhaust stream, comprising: exposing the exhaust stream to a catalyst having a stable cubic fluorite structure, wherein the catalyst comprises a solid solution oxygen storage material comprising about 30 mol% about 95 mol% zirconium; about 0.5 mol% to about 50 mol% cerium; up to about 20 mol% of a stabilizer selected from the group consisting of yttrium, rare earths, and combinations comprising at least one of the stabilizers; an amount of yttrium which amount may be provided in the stabilizer; and about 0.01 to about 25 mol% of indium, said indium being incorporated into said cubic fluorite structure, and wherein the amount of indium enhances the facile nature of the oxygen storage material by lowering of the reduction temperature of Ce 4+ ; a noble metal; and a high surface area porous support; wherein the solid solution oxygen storage material, noble metal, and the porous support are deposited on a substrate designed for use in a spark ignition or diesel engine environment; and reducing the concentration of at least one contaminant in the exhaust stream.