Patent ID: 9073011
Filing Date: 2015-07-07
Classification: B01D,Y02A

Abstract:
1. A method for reducing emissions from a diesel engine having associated therewith an exhaust system, the method providing a catalyst system for a catalytic reaction, the method further comprising the steps of: providing a substrate; and depositing on said substrate a washcoat suitable for deposition on the substrate and comprising at least one carrier material oxide, at least one catalyst, or mixtures thereof, wherein the at least one carrier material oxide is selected from the group consisting of titanium oxide, tin dioxide, zirconium dioxide and aluminum oxide, and wherein the catalyst comprises platinum and palladium; and wherein at least one carbon monoxide and at least one hydrocarbon is oxidized by the catalyst system, and wherein oxidation of sulfur dioxide also occurs and is at a lower percentage than that achievable without the at least one carrier material oxide; wherein the washcoat further comprises at least one second catalyst, wherein the at least one second catalyst comprises rhodium and iridium; and wherein the ratio of rhodium to iridium is selected from the group consisting of about 18:1, about 15:1, about 10:1, about 5:1, about 3:1, about 2.5:1, and about 1:1.