Three-way catalytic converter using nanoparticles
First Claim
Patent Images
1. A coated substrate comprising:
- oxidative catalytically active particles comprising oxidative composite nanoparticles bonded to first micron-sized carrier particles comprising metal oxide, wherein 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
reductive catalytically active particles comprising reductive composite nanoparticles bonded to second micron-sized carrier particles comprising metal oxide, wherein 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;
wherein the coated substrate has a platinum group metal loading of about 0.5 g/l to about 4.0 g/l.
2 Assignments
0 Petitions
Accused Products
Abstract
The present disclosure relates to a substrate comprising nanomaterials for treatment of gases, washcoats for use in preparing such a substrate, and methods of preparation of the nanomaterials and the substrate comprising the nanomaterials. More specifically, the present disclosure relates to a substrate comprising nanomaterial for three-way catalytic converters for treatment of exhaust gases.
-
Citations
32 Claims
-
1. A coated substrate comprising:
-
oxidative catalytically active particles comprising oxidative composite nanoparticles bonded to first micron-sized carrier particles comprising metal oxide, wherein 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 reductive catalytically active particles comprising reductive composite nanoparticles bonded to second micron-sized carrier particles comprising metal oxide, wherein 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; wherein the coated substrate has a platinum group metal loading of about 0.5 g/l to about 4.0 g/l. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. An oxidative washcoat composition comprising a solids content of:
-
35-75% by weight of oxidative catalytic active particles comprising composite oxidative nano-particles bonded to micron-sized carrier particles, and the composite oxidative nano-particles comprise a support nano-particle and an oxidative catalytic nano-particle; 5-25% by weight of micron-sized cerium zirconium oxide; 0.5-10% by weight of boehmite; 10-40% by weight micron-sized Al2O3, and optionally further comprising BaO.
-
-
32. A reductive washcoat composition comprising a solids content of:
-
40-95% by weight of reductive catalytic active particles comprising composite reductive nano-particles bonded to micron-sized carrier particles, and the composite reductive nano-particles comprise a support nano-particle and a reductive catalytic nano-particle; optionally comprising up to 30% by weight of micron-sized cerium zirconium oxide; 0.5-10% by weight of boehmite; 1-25% by weight micron-sized Al2O3; and optionally further comprising BaO.
-
Specification