Catalytic reduction of NOx with high activity catalysts with NH3 reductant
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/56
B01D-053/86
B01J-029/00
B01J-029/40
B01J-029/70
B01J-029/78
F01N-003/08
B01D-053/94
B01J-029/16
B01J-029/48
출원번호
US-0938499
(2013-07-10)
등록번호
US-8858907
(2014-10-14)
발명자
/ 주소
Dandekar, Ajit B.
Socha, Richard F.
Eckes, Richard L.
Waldrup, S. Beau
McMullan, Jason M.
출원인 / 주소
ExxonMobil Research and Engineering Company
대리인 / 주소
Barrett, Glenn T.
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
Methods and systems for selective catalytic reduction of NOx with an ammonia reductant and a zeolite catalyst loaded with at least two metals selected from the group of tungsten, cobalt, and vanadium. An exhaust stream including NOx and a reductant stream including ammonia are provided to a catalyti
Methods and systems for selective catalytic reduction of NOx with an ammonia reductant and a zeolite catalyst loaded with at least two metals selected from the group of tungsten, cobalt, and vanadium. An exhaust stream including NOx and a reductant stream including ammonia are provided to a catalytic reactor having the metal loaded zeolite catalyst at suitable operating temperatures for NOx reduction of at least 90%.
대표청구항▼
1. A method for selective catalytic reduction of NOx comprising: providing an exhaust stream from a combustion operation, the exhaust stream containing an amount of NOx;introducing at least a portion of the exhaust stream and a reductant stream including ammonia to a catalytic reactor comprising a z
1. A method for selective catalytic reduction of NOx comprising: providing an exhaust stream from a combustion operation, the exhaust stream containing an amount of NOx;introducing at least a portion of the exhaust stream and a reductant stream including ammonia to a catalytic reactor comprising a zeolite catalyst of at least one of ZSM-5, USY, ZSM-57, and MCM-41 loaded with at least two metals selected from the group consisting of tungsten, cobalt, and vanadium, the reductant stream and the at least a portion of the exhaust stream being introduced to the catalytic reactor at suitable operating conditions to reduce the amount of NOx in the exhaust stream; anddirecting the NOx-reduced exhaust stream from the catalytic reactor. 2. The method of claim 1, wherein the exhaust stream includes between about 0.1% and about 20% oxygen and between about 1% and about 10% water. 3. The method of claim 1, wherein providing the reductant stream comprises providing a molar ratio of ammonia to NOx between 0.5:1 and 1.5:1 in the catalytic reactor. 4. The method of claim 1, wherein providing the reductant stream comprises providing between 5 ppm and 2000 ppm of ammonia. 5. The method of claim 1, wherein introducing the reductant stream and the at least a portion of the exhaust stream collectively have a gaseous hourly space velocity of between 5K cc per hour and 120K cc per hour through the catalytic reactor. 6. The method of claim 1, wherein the operating temperature of the at least one catalytic reactor is between about 250° C. and about 400° C. 7. The method of claim 1, wherein the exhaust stream is provided from at least one refinery component selected from the group consisting of a combustion furnace, a boiler, a heater turbine, and a fluid catalytic cracking unit. 8. The method of claim 1, wherein the catalytic reactor is located relative a refinery flue of the at least one refinery component to maintain the catalytic reactor between 250° C. and 400° C. 9. The method of claim 1, wherein the operating temperature of the catalytic reactor is maintained between 250° C. and 400° C. by heating or cooling the exhaust stream. 10. The method of claim 1, wherein the zeolite catalyst comprises about 6 wt. % cobalt and about 4 wt. % tungsten loaded on ZSM-5. 11. The method of claim 1, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on ZSM-5. 12. The method of claim 1 wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on USY. 13. The method of claim 1, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on Beta. 14. The method of claim 1, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on ZSM-57. 15. The method of claim 1, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on MCM-41. 16. The method of claim 1, wherein the amount of NOx is reduced by at least 90%. 17. A system for selective catalytic reduction of NOx comprising: a conduit in fluid communication with a source of an exhaust stream from a combustion operation, the exhaust stream containing an amount of NOx;a source of a reductant stream including ammonia;a catalytic reactor in fluid communication with the conduit and the source of the reductant stream, the catalytic reactor comprising at one zeolite catalyst of at least one of ZSM-5, USY, ZSM-57, and MCM-41 loaded with at least two metals selected from the group consisting of tungsten, cobalt, and vanadium, andconfigured to receive at least a portion of the exhaust stream and the reductant stream at suitable operating conditions to reduce the amount of NOx in the exhaust stream;and an outlet in fluid communication with the catalytic reactor to direct the NOx reduced exhaust stream from the catalytic reactor. 18. The system of claim 17, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on ZSM-5. 19. The system of claim 17, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on USY. 20. The system of claim 17, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on Beta. 21. The system of claim 17, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on ZSM-57. 22. The system of claim 17, wherein the zeolite catalyst comprises about 6 wt. % vanadium and about 4 wt. % tungsten loaded on MCM-41. 23. A catalyst for use in selective catalytic reduction of NOx, wherein the catalyst is prepared according to the procedure comprising the steps of: permeating into a catalytic molecular sieve comprising at least one of ZSM-5, USY, ZSM-57, and MCM-41 an amount of cobalt and tungsten to provide a metal-modified catalyst with a loading of cobalt and tungsten; andcalcining the metal-modified catalyst in air to obtain a predetermined weight loading of about 6 wt. % cobalt and about 4 wt. % tungsten in the metal-modified catalyst.
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이 특허에 인용된 특허 (12)
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Golunski,Stanislaw Edmund; Houel,Valerie Marie Renee; Hawkings,Andrea; James,David William; Pollington,Stephen David; Poulston,Stephen; Rajaram,Raj Rao, Catalyst structure for treating NOcontaining exhaust gas from a lean burn engine.
Farnos Maria D. (Wilmington DE) McWilliams John P. (Woodbury NJ) Sharma Sanjay B. (Langhorne PA) Shihabi David S. (Pennington NJ), Catalytic system for the reducton of nitrogen oxides.
Socha, Richard F.; Vartuli, James C.; El-Malki, El-Mekki; Kalyanaraman, Mohan; Park, Paul W., Method and apparatus for combination catalyst for reduction of NOin combustion products.
Van Den Brink,Rudolf Willem; Pels,Jan Remmert, Method for the simultaneous removal of nitrogen oxides and laughing gas from a gas stream containing nitrogen oxides and laughing gas.
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