IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0925018
(2004-08-23)
|
등록번호 |
US-7481983
(2009-01-27)
|
발명자
/ 주소 |
- Patchett,Joseph Allan
- Dettling,Joseph Charles
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
18 인용 특허 :
27 |
초록
▼
Provided is an emissions treatment system and method for reducing NOx emissions in the exhaust stream produced from an internal combustion engine. The system has an injector for periodically metering ammonia or an ammonia precursor into an exhaust stream; and a first substrate with a first SCR catal
Provided is an emissions treatment system and method for reducing NOx emissions in the exhaust stream produced from an internal combustion engine. The system has an injector for periodically metering ammonia or an ammonia precursor into an exhaust stream; and a first substrate with a first SCR catalyst composition, downstream of the injector. The first substrate has an inlet end, an outlet end, a length extending between the inlet end to the outlet end, and wall elements. The first SCR catalyst composition is disposed on the wall elements from the inlet end toward the outlet end to form an inlet zone. The first substrate also has an NH3 destruction catalyst composition with a platinum group metal component dispersed on a refractory metal oxide. The NH3 destruction catalyst is disposed on the wall elements from the outlet end to form an outlet zone.
대표청구항
▼
What is claimed: 1. An emissions treatment system, comprising: a) an injector for periodically metering ammonia or an ammonia precursor into an exhaust stream; b) a first substrate comprising a first SCR catalyst composition, downstream of the injector; wherein the first substrate has an inlet end,
What is claimed: 1. An emissions treatment system, comprising: a) an injector for periodically metering ammonia or an ammonia precursor into an exhaust stream; b) a first substrate comprising a first SCR catalyst composition, downstream of the injector; wherein the first substrate has an inlet end, an outlet end, a length extending between the inlet end to the outlet end, wall elements and a plurality of passages defined by the wall elements; wherein the first SCR catalyst composition is disposed on the wall elements from the inlet end toward the outlet end to a length that is less than the substrate's axial length to form an inlet zone; an NH3 destruction catalyst composition comprising a platinum group metal component dispersed on a refractory metal oxide, wherein the NH3 destruction catalyst composition is disposed on the wall elements from the outlet end toward the inlet end to a length that is less than the substrate's axial length to form an outlet zone; and wherein there is from 0.1 to 10 g/ft3 of platinum group metal component in the outlet zone. 2. The emissions treatment system of claim 1, wherein the platinum group metal component is selected from the group consisting of platinum, palladium, rhodium and iridium components, and combinations thereof. 3. The emissions treatment system of claim 1, wherein there is an uncoated zone of at least 0.25 inches between the inlet and outlet zones. 4. The emissions treatment system of claim 1, wherein the NH3 destruction catalyst composition further comprises a cerium component. 5. The emissions treatment system of claim 4, wherein the cerium component is in bulk form. 6. The emissions treatment system of claim 1, wherein the first SCR catalyst composition comprises V2O5, WO3 and TiO2. 7. The emissions treatment system of claim 1, wherein the first SCR catalyst composition comprises a zeolite. 8. The emissions treatment system of claim 7, wherein the zeolite comprises a copper-exchanged or iron-exchanged zeolite. 9. The emissions treatment system of claim 1, wherein the first substrate is selected from the group consisting of a honeycomb flow-through substrate and a honeycomb wall flow substrate. 10. The emissions treatment system of claim 9, wherein the first substrate is a honeycomb flow-through substrate. 11. The emissions treatment system of claim 1, further comprising a diesel engine upstream and in fluid communication with the injector. 12. The emissions treatment system of claim 1, further comprising a second substrate interposed and in fluid communication with the injector and the first substrate. 13. The emissions treatment system of claim 12, wherein the second substrate is selected from the group consisting of a honeycomb flow-through substrate, an open-cell foam substrate and a honeycomb wall flow substrate. 14. The emissions treatment system of claim 13, wherein the second substrate is a honeycomb flow-through substrate comprising a second SCR catalyst composition. 15. The emissions treatment system of claim 14, wherein the first and second SCR catalyst compositions are the same. 16. The emissions treatment system of claim 1, wherein there is from 0.1 to less than 5 g/ft3 of platinum group metal component in the outlet zone. 17. The emissions treatment system of claim 16, wherein the platinum component is sulfated. 18. A catalyst article comprising a substrate comprising an inlet catalytic zone and an outlet catalytic zone, wherein said substrate has an inlet end, an outlet end, a length extending between the inlet end to the outlet end, wall elements and a plurality of passages defined by the wall elements; wherein an SCR catalyst composition is disposed on the wall elements from the inlet end toward the outlet end to a length that is less than the substrate's axial length to form the inlet catalytic zone; and an NH3 destruction catalyst composition comprising a platinum group metal component dispersed on a refractory metal oxide, which is disposed on the wall elements from the outlet end toward the inlet end to a length that is less than the substrate's axial length to form the outlet catalytic zone; and wherein the outlet catalytic zone comprises from 0.1 to 10 g/ft3 of platinum group metal component in the outlet catalytic zone. 19. The article of claim 18, wherein the outlet catalytic zone comprises from 0.5 to 5 g/ft3 of platinum group metal component. 20. The article of claim 18, wherein the platinum group metal component is selected from the group consisting of platinum, palladium, rhodium and iridium components, and combinations thereof. 21. The article of claim 18, comprising an uncoated zone of at least 0.25 inches between the inlet and outlet zones. 22. The article of claim 18, wherein the NH3 destruction catalyst composition further comprises a cerium component. 23. The article of claim 22, wherein the cerium component is in bulk form. 24. The article of claim 18, wherein the first SCR catalyst composition comprises V2O5, WO3 and TiO2. 25. The article of claim 18, wherein the first SCR catalyst composition comprises a zeolite. 26. The article of claim 25, wherein the zeolite comprises a copper-exchanged or iron-exchanged zeolite. 27. The article of claim 18, wherein the substrate is selected from the group consisting of a honeycomb flow-through substrate and a honeycomb wall flow substrate. 28. The article of claim 27, wherein the substrate is a honeycomb flow-through substrate. 29. The article of claim 18, wherein the platinum component is sulfated.
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