Emissions treatment system with lean NOx trap
US-9453443-B2 · Sep 27, 2016 · US
Small pore molecular sieve supported copper catalysts durable against lean/rich aging for the reduction of nitrogen oxides
US9802156B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9802156-B2 |
| Application number | US-201514918725-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 21, 2015 |
| Priority date | Apr 17, 2009 |
| Publication date | Oct 31, 2017 |
| Grant date | Oct 31, 2017 |
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- Title
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Abstract
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Provided is a system for treating a flowing exhaust gas comprising a lean NOx trap, a catalyzed soot filter, an ammonia or an ammonia precursor metering system for metering ammonia or an ammonia precursor into the flowing exhaust gas; and an SCR catalyst, wherein the SCR catalyst is disposed downstream of the lean NOx trap and comprises copper and/or iron supported on a small pore molecular sieve.
First claim
Opening claim text (preview).
What is claimed is: 1. A system for treating a flowing exhaust gas comprising: (a) a lean NOx trap; (b) a catalyzed soot filter; (c) an ammonia or an ammonia precursor metering system for metering ammonia or an ammonia precursor into the flowing exhaust gas; and (d) an SCR catalyst, wherein the SCR catalyst is disposed downstream of the lean NOx trap and comprises copper and/or iron supported on a small pore molecular sieve, wherein the small pore molecular sieve has a framework selected from the group consisting of AEI, AFT, AFX, DDR, ERI, LEV, KFI, and SAV. 2. The system of claim 1 , wherein said metering is controlled in response to the quantity of nitrogen oxides in the exhaust gas. 3. The system of claim 1 , wherein the small pore molecular sieve is a SAPO. 4. The system of claim 1 , wherein the small pore molecular sieve has a silica-to-alumina ratio of 8 to 150. 5. The system of claim 1 , wherein the small pore molecular sieve has an AEI framework. 6. The system of claim 1 , wherein the catalyzed soot filter comprises a copper-loaded small pore molecular sieve. 7. The system of claim 1 , wherein the SCR catalyst is coated on flow-through monolith. 8. The system of claim 1 , wherein the catalyzed soot filter is coated with an SCR catalyst. 9. The system of claim 1 , wherein the small pore molecular sieve has an AFT Framework. 10. The system of claim 1 , wherein the small pore molecular sieve has an AFX Framework. 11. The system of claim 1 , wherein the small pore molecular sieve has an DDR framework. 12. The system of claim 1 , wherein the small pore molecular sieve has an ERI framework. 13. The system of claim 1 , wherein the small pore molecular sieve has an LEV framework. 14. The system of claim 1 , wherein the small pore molecular sieve has an KFI framework. 15. The system of claim 1 , wherein the small pore molecular sieve has an SAV framework.
Assignees
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Classifications
by catalytic processes · CPC title
- B01J29/072Primary
Iron group metals or copper · CPC title
Zeolites · CPC title
Iron group metals or copper · CPC title
Metals · CPC title
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Frequently asked questions
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- What does patent US9802156B2 cover?
- Provided is a system for treating a flowing exhaust gas comprising a lean NOx trap, a catalyzed soot filter, an ammonia or an ammonia precursor metering system for metering ammonia or an ammonia precursor into the flowing exhaust gas; and an SCR catalyst, wherein the SCR catalyst is disposed downstream of the lean NOx trap and comprises copper and/or iron supported on a small pore molecular sieve.
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification B01J29/072. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 31 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).