Three-way Catalyst Systems Including Fe-activated Rh and Ba-Pd Material Compositions
US-2015352532-A1 · Dec 10, 2015 · US
Three-way catalyst
US9707545B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9707545-B2 |
| Application number | US-201615016395-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 5, 2016 |
| Priority date | Feb 5, 2015 |
| Publication date | Jul 18, 2017 |
| Grant date | Jul 18, 2017 |
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Abstract
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A three-way catalyst composition, and its use in an exhaust system for internal combustion engines, is disclosed. The three-way catalyst composition comprises rhodium, a cerium-containing oxide, and a supported palladium component. The supported palladium component comprises palladium, barium, and cobalt and alumina. The three-way catalyst composition shows improved light-off performance.
First claim
Opening claim text (preview).
I claim: 1. A three-way catalyst composition comprising rhodium, a ceria-containing oxide, and a supported palladium component, wherein the supported palladium component comprises palladium, barium, and cobalt and alumina. 2. The three-way catalyst composition of claim 1 wherein the supported palladium component comprises palladium, barium and a cobalt aluminate spinel. 3. The three-way catalyst composition of claim 1 wherein the rhodium is supported on an inorganic oxide carrier. 4. The three-way catalyst composition of claim 3 wherein the inorganic oxide carrier is selected from the group consisting of alumina, silica, titania, zirconia, ceria, niobia, tantalum oxides, molybdenum oxides, tungsten oxides, and mixed oxides or composite oxides thereof. 5. The three-way catalyst composition of claim 1 wherein the ceria-containing oxide is selected from the group consisting of cerium oxide, a ceria-zirconia mixed oxide, and an alumina-ceria-zirconia mixed oxide. 6. The three-way catalyst composition of claim 1 wherein the supported palladium component comprises 0.1 to 1 weight percent palladium. 7. The three-way catalyst composition of claim 1 wherein the supported palladium component comprises 1 to 10 weight percent barium. 8. The three-way catalyst composition of claim 1 wherein the supported palladium component comprises 0.5 to 20 weight percent cobalt. 9. A three-way catalyst article comprising the three-way catalyst composition of claim 1 supported on a metal or ceramic substrate. 10. The three-way catalyst article of claim 9 wherein the substrate is a flow-through monolith. 11. The three-way catalyst article of claim 9 comprises a substrate and at least one layer on the substrate, wherein the at least one layer comprises the three-way catalyst composition. 12. The three-way catalyst article of claim 9 having two layers disposed on the substrate, wherein a first layer comprises the supported palladium component and a second layer comprises rhodium and the ceria-containing oxide. 13. The three-way catalyst article of claim 12 , wherein the first layer is disposed on the substrate and the second layer is deposited on the first layer. 14. A method for treating an exhaust gas from an internal combustion engine comprising contacting the exhaust gas with the three-way catalyst article of claim 9 .
Assignees
Inventors
Classifications
Palladium · CPC title
Cerium · CPC title
Rhodium · CPC title
Zirconium · CPC title
Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] · CPC title
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- What does patent US9707545B2 cover?
- A three-way catalyst composition, and its use in an exhaust system for internal combustion engines, is disclosed. The three-way catalyst composition comprises rhodium, a cerium-containing oxide, and a supported palladium component. The supported palladium component comprises palladium, barium, and cobalt and alumina. The three-way catalyst composition shows improved light-off performance.
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification B01J23/8946. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 18 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).