Patent ID: 7589045

Claim:
An exhaust gas purifying catalyst comprising: a complex oxide having a ratio formula of Ln 1-a X a AI 1-b Z b O 3, wherein Ln is a rare earth element, X is an element selected from Group 2 of the periodic table, Z is an element selected from Groups 2, 3, 5, and 12 to 14 of the periodic table, 0.02< a <0.30, and 0.02<b<0.30; and Pd which is supported on the complex oxide, wherein the catalyst is produced via a process in which at least one compound is added to a nitrate salt or chloride salt water solution of constituent element; wherein the compound is selected from the group consisting of: carboxylic acid having 2 to 20 carbons and an OH group or SH group; dicarboxylic acid having 2 to 3 carbons; and monocarboxylic acid having 1 to 20 carbons.