Three-way Catalyst Systems Including Fe-activated Rh and Ba-Pd Material Compositions
US-2015352532-A1 · Dec 10, 2015 · US
Three-way catalyst and its use in exhaust systems
US9656209B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9656209-B2 |
| Application number | US-201615016371-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 5, 2016 |
| Priority date | Feb 6, 2015 |
| Publication date | May 23, 2017 |
| Grant date | May 23, 2017 |
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- Title
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Abstract
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A three-way catalyst is disclosed. The three-way catalyst comprises a palladium component comprising palladium and a ceria-zirconia-alumina mixed or composite oxide, and also comprises a rhodium component comprising rhodium and a zirconia-containing material. The palladium component and the rhodium component are coated onto a silver-containing extruded molecular sieve substrate. The invention also includes an exhaust system comprising the three-way catalyst. The three-way catalyst results in improved hydrocarbon storage and conversion, in particular during the cold start period.
First claim
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We claim: 1. A three-way catalyst comprising: (1) a palladium component comprising palladium and a ceria-zirconia-alumina mixed or composite oxide; and (2) a rhodium component comprising rhodium and a zirconia-containing material, wherein the palladium component and the rhodium component are coated onto a silver-containing extruded molecular sieve substrate. 2. The three-way catalyst of claim 1 wherein the palladium component and the rhodium component are located in the same layer. 3. The three-way catalyst of claim 1 wherein the palladium component and the rhodium component are located in different layers. 4. The three-way catalyst of claim 1 wherein the zirconia-containing material is a ceria-zirconia mixed or composite oxide. 5. The three-way catalyst of claim 1 wherein the silver-containing extruded molecular sieve substrate is a flow-through substrate. 6. The three-way catalyst of claim 1 wherein the silver-containing extruded molecular sieve substrate is a filter substrate. 7. The three-way catalyst of claim 1 wherein the silver-containing extruded molecular sieve substrate comprises a molecular sieve having a Framework Type selected from the group consisting of ACO, AEI, AEN, AFN, AFT, AFX, ANA, APC, APD, ATT, CDO, CHA, DDR, DFT, EAB, EDI, EPI, ERI, GIS, GOO, IHW, ITE, ITW, LEV, KFI, MER, MON, NSI, OWE, PAU, PHI, RHO, RTH, SAT, SAV, SIV, THO, TSC, UEI, UFI, VNI, YUG, ZON, MFI, FER, MWW, EUO, CON, BEA, FAU, MOR, and EMT. 8. The three-way catalyst of claim 7 wherein the molecular sieve is selected from the group consisting of SAPO-34, SSZ-33, SSZ-13, SSZ-39, beta zeolite, ZSM-5 zeolite, and Y-zeolite. 9. The three-way catalyst of claim 1 wherein the silver-containing extruded molecular sieve substrate comprises from 1 to 700 g/ft 3 silver. 10. A method for treating an exhaust gas from an internal combustion engine comprising contacting the exhaust gas with a three-way catalyst of claim 1 .
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Classifications
specially adapted for catalytic conversion (F01N3/22 takes precedence) · CPC title
not in framework positions · CPC title
Coatings comprising impregnated particles · CPC title
- B01J37/0244Primary
Coatings comprising several layers · CPC title
- B01J37/02Primary
Impregnation, coating or precipitation ({B01J37/0009 and B01J37/0018 take precedence } ; protection by coating B01J33/00) · CPC title
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- What does patent US9656209B2 cover?
- A three-way catalyst is disclosed. The three-way catalyst comprises a palladium component comprising palladium and a ceria-zirconia-alumina mixed or composite oxide, and also comprises a rhodium component comprising rhodium and a zirconia-containing material. The palladium component and the rhodium component are coated onto a silver-containing extruded molecular sieve substrate. The invention a…
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification B01J37/0244. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue May 23 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).