Patent ID: 9566568
Date: 2017-02-14
CPC Classifications: B01D,B01J,Y02A,Y02T

Claim:
1. A coated substrate comprising: a) a substrate; b) a first washcoat layer on the substrate comprising zeolites; c) a second washcoat layer on the substrate comprising a first catalytically active material comprising platinum and palladium, wherein the first catalytically active material comprises first composite nanoparticles embedded within porous micron-sized carrier particles; wherein the first composite nanoparticles comprises a first support nanoparticle and a first catalytic nanoparticle, wherein the first catalytic nanoparticle comprises a platinum-palladium alloy; and d) a third washcoat layer on the substrate comprising a second catalytically active material comprising platinum and palladium; wherein the second catalytically active material comprises second composite nanoparticles embedded within porous micron-sized carrier particles; wherein the second composite nanoparticles comprises a second support nanoparticle and a second catalytic nanoparticle, wherein the second catalytic nanoparticle comprises a platinum-palladium alloy; wherein the second washcoat layer is deposited on the first washcoat layer, and the third washcoat layer is deposited on the second washcoat layer.