Patent ID: 9533299
Date: 2017-01-03
CPC Classifications: B01D,B01J,F01N,Y02A,Y02T,Y10T

Claim:
1. A method of forming a coated substrate, the method comprising: a) coating a substrate with a washcoat composition comprising oxidative catalytically active particles; wherein the oxidative catalytically active particles comprise oxidative composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the oxidative composite nanoparticles comprise a first support nanoparticle comprising metal oxide and one or more oxidative catalyst nanoparticles comprising a first platinum group metal; and b) coating the substrate with a washcoat composition comprising reductive catalytically active particles; wherein the reductive catalytically active particles comprise reductive composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the reductive composite nanoparticles comprise a second support nanoparticle comprising metal oxide and one or more reductive catalyst nanoparticles comprising a second platinum group metal.