Regenerable sulfur traps for on-board vehicle applications
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/50
B01D-053/56
B01D-053/94
F01N-003/28
출원번호
US-0933508
(2013-07-02)
등록번호
US-8685353
(2014-04-01)
발명자
/ 주소
El-Malki, El-Mekki
Weissman, Walter
Polini, Paul James
출원인 / 주소
Exxonmobil Research and Engineering Company
대리인 / 주소
Weisberg, David M.
인용정보
피인용 횟수 :
0인용 특허 :
31
초록▼
Provided are improved exhaust gas cleaning systems and methods for treating exhaust gas from a combustion source that include a hydrogen generation system, a regenerable sulfur oxides trap, and a regenerable nitrogen storage reduction (NSR) catalyst trap. The improved exhaust gas cleaning systems an
Provided are improved exhaust gas cleaning systems and methods for treating exhaust gas from a combustion source that include a hydrogen generation system, a regenerable sulfur oxides trap, and a regenerable nitrogen storage reduction (NSR) catalyst trap. The improved exhaust gas cleaning systems and methods allow for the sulfur released from the sulfur trap to pass through the nitrogen oxide trap with no or little poisoning of NOx storage and reduction sites, which significantly improves NSR catalyst trap lifetime and performance to meet future emissions standards. The disclosed exhaust gas cleaning systems are suitable for use in internal combustion engines (e.g., diesel, gasoline, CNG) which operate with lean air/fuel ratios over most of the operating period.
대표청구항▼
1. A method for improving the treatment of exhaust gas comprising the steps of: i) providing a combustion source with an exhaust gas cleaning system comprising: a) a H2 rich gas generator system,b) a regenerable sulfur oxides trap, andc) a regenerable nitrogen storage reduction (NSR) catalyst trap,w
1. A method for improving the treatment of exhaust gas comprising the steps of: i) providing a combustion source with an exhaust gas cleaning system comprising: a) a H2 rich gas generator system,b) a regenerable sulfur oxides trap, andc) a regenerable nitrogen storage reduction (NSR) catalyst trap,wherein the sulfur oxides trap comprises a catalyst selected from oxide of Fe, Co, Ag, Cu, Mn, Ce, Ce—Zr, Ce—Fe, Mn—La—Zr, Fe—La—Zr, Cu—La—Zr, Co—La—Zr Pt—Ba, Pt, and combinations thereof, andwherein the NSR catalyst trap is positioned downstream of the sulfur oxides trap and the H2 rich gas generator system,ii) regenerating the sulfur oxides trap and the NSR catalyst trap with the H2 rich gas and a fuel rich fuel to air exhaust gas, andiii) maintaining the NSR catalyst trap at a temperature of from about 400 to about 600° C. in the presence of H2 from the H2 rich gas generator system at an atomic ratio of H2 to the released sulfur atom species of greater than or equal to about 65 during regeneration of the sulfur oxides trap,wherein the sulfur atom species released by the sulfur oxides trap pass through the NSR catalyst trap with no poisoning of the NOx storage and NOx reduction components. 2. The method of claim 1, wherein the sulfur oxides trap further comprises a support material selected from an oxide of alumina, stabilized gamma alumina with rare earth components, MCM-41, zeolites, silica, magnesium, zirconia, ceria, ceria-zirconia, titania, titania-zirconia, and combinations thereof. 3. The method of claim 2, wherein the sulfur oxides trap adsorbs SOx as a metal sulfate at a temperature from 200 to 600° C. under lean exhaust conditions. 4. The method of claim 3, wherein the sulfur oxides trap desorbs the trapped metal sulfate by reduction at a temperature from 300 to 575° C. under rich exhaust conditions. 5. The method of claim 4, wherein the sulfur oxides trap is a mixed Mn—La—Zr oxide, wherein the sulfur oxides trap desorbs the trapped metal sulfate by reduction at a temperature from 500 to 575° C. under a H2 rich exhaust conditions. 6. The method of claim 2, wherein the support material is alumina. 7. The method of claim 3 wherein the sulfur oxides trap is a Fe oxide supported on alumina, wherein the sulfur oxides trap desorbs the trapped metal sulfate by reduction at a temperature from 400 to 500° C. under H2 rich exhaust conditions. 8. The method of claim 1, wherein the Mn—La—Zr oxide catalyst comprises from 1 to 25 wt % Mn, from 1 to 10 wt % La, from 1 to 60 wt % Zr, and the remaining wt % oxygen. 9. The method of claim 8, wherein the Mn—La—Zr oxide catalyst has a sample surface area from 50 to 400 m2/gram. 10. The method of claim 9, wherein the Mn—La—Zr oxide is supported on alumina support in an amount of from 1 to 90 wt %. 11. The method of claim 1, wherein the Fe oxide is supported on an alumina support in an amount of from 1 to 20 wt %. 12. The method of claim 11, wherein the alumina support has a surface area of from 50 to 500 m2/g. 13. The method of claim 1, further comprising a clean-up catalyst trap positioned downstream of the NSR catalyst trap. 14. The method 13, wherein the clean-up catalyst trap adsorbs hydrogen sulfide in a rich fuel to air ratio condition and releases SO2 in a lean fuel to air ratio condition. 15. The method of claim 14, wherein the clean-up catalyst trap comprises a base metal oxide selected from iron oxide, nickel oxide, manganese oxide, silver oxide, cobalt oxide, and combinations thereof. 16. The method of claim 15, wherein the base metal oxide is supported on a material selected from alumina, stabilized gamma alumina, MCM-41, zeolites, titania, titania-zirconia, and combinations thereof. 17. The method of claim 13, wherein the clean-up catalyst trap comprises components for HC/CO oxidation selected from ceria, silver, a platinum group metal, and combinations thereof. 18. The method of claim 17, wherein the components for HC/CO oxidation are supported on a material selected from alumina, stabilized gamma alumina, MCM-41, zeolites, titania, titania-zirconia, and combinations thereof. 19. The method of claim 13, wherein the clean-up catalyst comprises components for NH3 trapping selected from acidic metal oxides, zeolites, and metal-containing zeolites. 20. The method of claim 19, wherein the acidic metal oxides are selected from tungsten-zirconia, sulfated zirconia, sulfated ceria-zirconia, phosphated zirconia, and phosphated ceria zirconia. 21. The method of claim 20, wherein the zeolites are selected from ZSM-5, Beta, MCM-68, Faujasite, and MCM-41. 22. The method of claim 19, wherein the metal-containing zeolites comprise a metal selected from copper, iron, cobalt and silver. 23. The method of claim 1, wherein a catalyzed diesel particulate filter is positioned upstream of the sulfur oxides trap. 24. The method of claim 1, wherein the step of regenerating the sulfur trap catalyst trap and the NSR catalyst trap with a fuel rich air/fuel ratio is in presence of a low concentration of H2 at a temperature of from about 300 to 575° C. 25. The method of claim 1, wherein the combustion source is a lean-burn engine of a vehicle.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (31)
Chester Arthur W. (Cherry Hill NJ) Kirker Garry W. (Washington Township ; Gloucester County NJ), Amorphous refractory composition.
Willigan, Rhonda R.; Vanderspurt, Thomas Henry; Tulyani, Sonia; Radhakrishnan, Rakesh; Opalka, Susanne Marie; Emerson, Sean C., Catalyst support of mixed cerium zirconium titanium oxide, including use and method of making.
Modica Frank S. (Naperville IL) Barr Mark K. (Wheaton IL) Huff George A. (Naperville IL) Cayton Roger H. (Naperville IL) Alexander Bruce D. (Villa Park IL) Kretchmer Richard A. (Clarendon Hills IL), Control of exhaust emissions from an internal combustion engine.
Augustine Robert L. (Livingston NJ) Fournier Jay A. (Richmond VA) Paine ; III John B. (Midlothian VA) Shafer Kenneth H. (Midlothian VA) Tanielyan Setrak K. (South Orange NJ), Conversion of carbon monoxide using cobalt-based metal oxide catalysts.
Absil Robert P. L. (Mantua NJ) Angevine Philip J. (West Deptford NJ) Chester Arthur W. (Cherry Hill NJ) Kirker Garry W. (Washington Township ; Gloucester County NJ), Lanthana-alumina-aluminum phosphate catalyst composition.
Seamans James Dallas (Woodlands TX) Adams Charles Terrell (Houston TX) Dominguez Wendy Beth (Rosenberg TX) Chen Andrew An-Ju (Houston TX), Method of presulfurizing a hydrotreating, hydrocracking or tail gas treating catalyst.
Dettling Joseph C. (Howell NJ) Lui Yiu-Kwan (Parlin NJ), Palladium containing ceria-supported platinum catalyst and catalyst assembly including the same.
Strehlau Wolfgang,DEX ; Gobel Ulrich,DEX ; Lox Egbert,DEX ; Muller Wilfried,DEX ; Domesle Rainer,DEX, Process for operating an exhaust gas treatment unit containing a sulfur trap and a nitrogen oxides storage catalyst.
Weissman,Walter; El Malki,El Mekki, Sulfur oxide/nitrogen oxide trap system and method for the protection of nitrogen oxide storage reduction catalyst from sulfur poisoning.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.