Patent ID: 7199079
Filing Date: 2007-04-03
Classification: B01D,B01J,Y02A,Y02T,Y10S

Abstract:
1. A method for production of a purification catalyst for exhaust gas, in which Pd is supported on an aluminum composite oxide having the formula LnAl 1−x M x O 3 in which Ln is a rare-earth element, and the element M is one element selected from groups 1 to 5 and groups 12 to 14, wherein X is not 0 or 1, the method comprising: preparing an aqueous nitrate solution or aqueous chloride solution of elements forming the aluminum composite oxide; and adding at least one compound selected from the group consisting of compounds of a carboxylic acid of carbon number 3 to 20 and having a hydroxyl group or a mercapto group, a dicarboxylic acid having a carbon number of 2 or 3, and a monocarboxylic acid having a carbon number of 1 to 20 to the aqueous nitrate solution or aqueous chloride solution.