Patent ID: 6475949
Filing Date: 2002-11-05
Classification: B01D,B01J,Y02T

Abstract:
A promoter for purifying internal combustion engine exhaust gas consisting essentially of:(A) particulate aluminum oxide; and (B) a double oxide of (i) cerium and (ii) at least one member selected from the group consisting of zirconium, yttrium, strontium, barium and rare earth elements, coated on the particulate aluminum oxide; wherein the particulate aluminum oxide has an average particle size of not less than 10 &mgr;m; and wherein the component ratio of the aluminum oxide to the double oxide ranges from 1:0.5 to 1:4, as expressed in terms of the weight ratio, and the component ratio of the cerium present in the double oxide to the at least one member selected from the group consisting of zirconium, yttrium, strontium, barium and rare earth elements ranges from 1:0.1 to 0.1:1, as expressed in terms of the weight ratio of reduced amounts of the oxides thereof.