Diesel exhaust system including NOx-trap
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0297729
(2001-06-06)
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등록번호 |
US-7404933
(2008-07-29)
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우선권정보 |
GB-0013609.3(2000-06-06) |
국제출원번호 |
PCT/GB01/002483
(2001-06-06)
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§371/§102 date |
20030904
(20030904)
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국제공개번호 |
WO01/094760
(2001-12-13)
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발명자
/ 주소 |
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출원인 / 주소 |
- Johnson Matthey Public Limited Company
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
9 |
초록
▼
An exhaust system for a diesel engine, which engine being operable in a plurality of modes including an idling mode, wherein the engine emits a relatively cool exhaust gas, and a running mode, wherein the engine emits a relatively hot exhaust gas, includes a solid NOx absorbent, whereby NOx is absor
An exhaust system for a diesel engine, which engine being operable in a plurality of modes including an idling mode, wherein the engine emits a relatively cool exhaust gas, and a running mode, wherein the engine emits a relatively hot exhaust gas, includes a solid NOx absorbent, whereby NOx is absorbed by the NOx absorbent during the idling mode and is desorbed and passed to atmosphere during the running mode and/or during acceleration from idling to running as the temperature of the exhaust gas increases, wherein during all modes the engine runs lean and the exhaust gas composition is lambda>1.
대표청구항
▼
The invention claimed is: 1. An exhaust system for a diesel engine, which engine being operable in a plurality of modes including an idling mode during which the engine emits a relatively cool exhaust gas and a running mode during which the engine emits a relatively hot exhaust gas, the exhaust sys
The invention claimed is: 1. An exhaust system for a diesel engine, which engine being operable in a plurality of modes including an idling mode during which the engine emits a relatively cool exhaust gas and a running mode during which the engine emits a relatively hot exhaust gas, the exhaust system comprising a solid NOx absorbent, wherein NOx in an exhaust gas is absorbed by the NOx absorbent during said idling mode and is desorbed and passed to atmosphere during said running mode, during acceleration from idling to running or during said running mode and during acceleration from idling to running mode, as the temperature of the exhaust gas increases, wherein during all modes the engine runs lean and the exhaust gas composition is lambda>1; and a soot filter upstream of the NOx absorbent. 2. An exhaust system according to claim 1, further comprising an oxidation catalyst upstream of the NOx absorbent. 3. An exhaust system according to claim 1, further comprising an oxidation catalyst and a downstream filter upstream of the NOx absorbent. 4. An exhaust system according to claim 1, wherein the NOx absorbent comprises at least one of: (a) an alkali metal compound, an alkaline earth metal compound, a rare earth metal compound and a transition metal compound capable of forming a nitrate, capable of forming a nitrite or capable of forming both a nitrate and a nitrite, which nitrate or nitrite having adequate stability in absorbing conditions and being capable of evolving nitrogen oxides, nitrogen or nitrogen oxides and nitrogen in regenerating conditions; (b) an adsorptive material; and (c) mixtures of (a) and (b). 5. An exhaust system according to claim 4, wherein the absorbent is catalyzed. 6. An exhaust system according to claim 5, wherein the catalyst of the absorbent comprises at least one platinum group metal. 7. An exhaust system according to claim 4, wherein the NOx absorbent comprises (a) and the at least one alkali metal compound, alkaline earth metal compound, rare earth metal compound or transition metal compound is an oxide thereof. 8. An exhaust system according to claim 4, wherein the NOx absorbent comprises (b) and the at least one adsorptive material is selected from the group consisting of zeolites, carbons and high surface-area oxides. 9. A diesel engine including an exhaust system according to claim 1. 10. A heavy-duty diesel engine according to claim 9. 11. An exhaust system according to claim 1, wherein the NOx absorbent comprises BaO. 12. An exhaust system according to claim 1, wherein the NOx absorbent comprises CuO.
이 특허에 인용된 특허 (9)
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Lampert Jordan K. ; Deeba Michel ; Farrauto Robert J., Catalyzed hydrocarbon trap material and method of making the same.
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Dogahara Takashi,JPX ; Koga Kazuo,JPX ; Danno Yoshiaki,JPX ; Sanbayashi Daisuke,JPX ; Iida Kozo,JPX ; Serizawa Satoru,JPX ; Kobayashi Norihisa,JPX, Exhaust gas purifying apparatus.
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Yamamoto, Shinji; Takaya, Masahiro, Exhaust gas purifying catalyst and method of producing same.
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Takeshima Shinichi (Susono JPX) Seto Satomi (Gotenba JPX) Hirota Shinya (Susono JPX), NOx decreasing apparatus for an internal combustion engine.
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Twigg, Martyn Vincent, Process and apparatus for treating combustion exhaust gas.
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Cole Jerald A., Process for reducing NO.sub.x from mobile source engine exhaust.
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Kharas Karl C. C. ; Robota Heinz J., Reduction of NO.sub.x in the exhaust gases from internal combustion engines containing excess oxygen.
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Rudy Wayne M. (Morristown NJ), Staged three-way conversion catalyst and method of using the same.
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Cooper Barry J. (Radnor PA) Jung Hyun J. (Wayne PA) Thoss James E. (West Chester PA), Treatment of diesel exhaust gases.
이 특허를 인용한 특허 (4)
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Danby, Susannah E.; Heaton, David Mark; Faulkner, Stephen Anthony; Southall, Robert, Exhaust treatment system implementing regeneration control.
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Zhang, Wenzhong; Taubert, Todd R.; Ricke, Timothy L.; Imes, Julian A., Low temperature diesel particulate matter reduction system.
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Zhang, Wenzhong; Taubert, Todd R.; Ricke, Timothy L.; Imes, Julian A., Low temperature diesel particulate matter reduction system.
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Wan, Chung Z., NOx adsorber catalyst with superior low temperature performance.
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