Back to results
US 9,156,025 B2Granted
Three-way catalytic converter using nanoparticles
AssigneeSDCmaterials, Inc.
InventorsXiwang Qi, Maximilian A. Biberger
Life of this patent
Estimating the term…
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.
Claims32
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.
A washcoat composition comprising a solids content of:
- 25-75% 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;
- 5-50% 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;
- 1-40% by weight of micron-sized cerium zirconium oxide;
- 0.5-10% by weight of boehmite;
- and
- 1-25% by weight micron-sized Al2O3.
3 more elements
Dependencies are inferred from the claim text.