Patent ID: 7259127
Filing Date: 2007-08-21
Classification: B01D,B01J,Y02A,Y02T

Abstract:
1. A method for production of a purification catalyst for exhaust gas comprising: preparing an aqueous nitrate solution of elements forming a Pd-based composite oxide, the elements consisting of only Pd and at least one element selected from rare earth metals; adding at least one compound selected from the group of compounds consisting of carboxylic acid of carbon number 2 to 20 having a OH group or a SH group, dicarboxylic acid of carbon number 2 or 3, and monocarboxylic acid of carbon number 1 to 20 to the aqueous nitrate solution; preparing a carboxylic acid complex polymer by evaporating and drying the aqueous nitrate solution; and burning the carboxylic acid complex polymer and forming the purification catalyst consisting of only a Pd-rare earth metal composite oxide.