Catalytic reduction of NOx with high activity catalysts with acetaldehyde reductant
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/56
B01D-053/75
B01D-053/86
출원번호
US-0938431
(2013-07-10)
등록번호
US-8795621
(2014-08-05)
발명자
/ 주소
Dandekar, Ajit B.
Socha, Richard F.
Eckes, Richard L.
Waldrup, S. Beau
McMullan, Jason M.
출원인 / 주소
ExxonMobil Research and Engineering
대리인 / 주소
Barrett, Glenn T.
인용정보
피인용 횟수 :
0인용 특허 :
17
초록▼
Methods and systems are provided for selective catalytic reduction of NOx with a low molecular low molecular weight aldehyde, e.g., acetaldehyde, as a reductant using a catalyst system including two catalysts. An exhaust stream containing an amount of NO from a combustion operation is provided. A po
Methods and systems are provided for selective catalytic reduction of NOx with a low molecular low molecular weight aldehyde, e.g., acetaldehyde, as a reductant using a catalyst system including two catalysts. An exhaust stream containing an amount of NO from a combustion operation is provided. A portion of the exhaust stream is introduced to a first catalyst to convert the NO to NO2. The exhaust stream from the first catalyst with NO2 and a reductant stream containing a low molecular weight aldehyde, e.g., acetaldehyde, are introduced to the second catalyst to convert the NO2 to N2. The first catalyst can be bulk Co3O4, Ru or Pt loaded on alumina; the second catalyst can be various zeolites, or zeolites loaded with potassium.
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 NO;introducing at least a portion of the exhaust stream to a first catalytic reactor comprising a first catalyst at suitable operating
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 NO;introducing at least a portion of the exhaust stream to a first catalytic reactor comprising a first catalyst at suitable operating conditions to convert an amount of NO in the exhaust stream to NO2, wherein the first catalyst is selected from the group consisting of bulk Co3O4, Ru loaded on a metal oxide, and Pt loaded on a metal oxide;directing the exhaust stream with NO2 from the first catalyst and a reductant stream including a low molecular weight aldehyde to a second catalyst including a zeolite at suitable operating conditions to reduce at least a portion of the NO2 to N2. 2. The method of claim 1, wherein the first catalytic reactor includes a vessel, and the second catalyst is within the vessel of the first catalytic reactor. 3. The method of claim 1, wherein the second catalyst is in a second catalytic reactor located downstream of the first catalytic reactor. 4. The method of claim 1, wherein the low-molecular aldehyde is acetadehyde. 5. The method of claim 4, wherein the exhaust stream includes between about 0.1% and about 20% oxygen and about 1-10% water. 6. The method of claim 4, wherein the operating temperature of the first catalytic reactor is between about 150° C. and about 450° C. 7. The method of claim 4, wherein the operating temperature of the first catalytic reactor is about 300° C. 8. The method of claim 4, wherein the operating temperature of the second catalyst is about 150° C. to about 400° C. 9. The method of claim 4, wherein the ratio of acetaldehyde in the reductant stream and NO2 from the first catalyst is about 0.5 to 4. 10. The method of claim 4, wherein the first catalyst comprises 2 wt. % Ru loaded on alumina. 11. The method of claim 4, wherein the first catalyst comprises 2 wt. % Pt loaded on alumina. 12. The method of claim 4, wherein the second catalyst include a zeolite selected from the group consisting of ZSM-57, MCM-68, ZSM-5B, Mordenite, Chabazite, ZSM-35, MCM-49, ZSM-11, ZSM-5C, MCM-22, USY, ZSM-48, Beta. 13. The method of claim 4, wherein the second catalyst comprises Beta loaded with potassium. 14. The method of claim 4, wherein the second catalyst comprises ZSM-5C loaded with potassium. 15. The method of claim 1, wherein the exhaust stream from the second catalyst includes a residual amount of NOx, the method further comprising recycling the exhaust stream with the residual amount of NOX to the first catalytic reactor. 16. The method of claim 1, wherein the first catalytic reactor is located relative a refinery flue of the at least one refinery component to maintain the first catalytic reactor between 200° C. and 400° C. 17. The method of claim 1, wherein the operating temperature of the first catalytic reactor is maintained between 200° C. and 400° C. by heating or cooling the exhaust stream. 18. 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. 19. 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 NO;a first catalytic reactor in fluid communication with the conduit and the source of the reductant stream, the first catalytic reactor comprising a first catalyst selected from the group consisting of bulk Co3O4, Ru loaded on a metal oxide, and Pt loaded on a metal oxide;an outlet in fluid communication with the first catalytic reactor to direct the NOx treated exhaust stream from the first catalytic reactor;a second catalyst including a zeolite, the second catalyst in fluid communication with the first catalyst; anda reductant feedline in fluid communication with the second catalyst to introduce a reductant stream including a low molecular weight aldehyde to the second catalyst. 20. The system of claim 19, wherein the first catalytic reactor includes a vessel, and the second catalyst is within the vessel of the first catalytic reactor. 21. The system of claim 19, wherein the second catalyst is in a second catalytic reactor located downstream of the first catalytic reactor. 22. The system of claim 19, wherein the low-molecular aldehyde is acetaldehyde. 23. The system of claim 19, wherein the first catalyst comprises 2 wt. % Ru loaded on alumina. 24. The system of claim 19, wherein the first catalyst comprises 2 wt. % Pt loaded on alumina. 25. The system of claim 19, wherein the second catalyst include a zeolite selected from the group consisting of ZSM-57, MCM-68, ZSM-5B, Mordenite, Chabazite, ZSM-35, MCM-49, ZSM-11, ZSM-5C, MCM-22, USY, ZSM-48, Beta. 26. The system of claim 19, wherein the second catalyst comprises Beta loaded with potassium. 27. The system of claim 19, wherein the second catalyst comprises ZSM-5C loaded with potassium. 28. The system of claim 19, wherein the source of the exhaust stream is a refinery component selected from the group consisting of a combustion furnace, a boiler, a heater turbine, and a fluid catalytic cracking unit. 29. The system of claim 28, wherein the first catalytic reactor is located downstream from a flue of the at least one refinery component to maintain the first catalytic reactor between about 200° C. and about 400° C. 30. The system of claim 19, further comprising a heat exchanger operatively coupled to heat the exhaust stream to maintain the first catalytic reactor at a temperature of between about 200° C. and about 400° C.
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.
Jntgen Harald (Bonscheidter Str. 79 D-4300 Essen DEX) Knoblauch Karl (Semperstr. 55 D-4300 Essen DEX) Richter Ekkehard (Schmachtenbergstr. 89 D-4300 Essen DEX) Khl Helmut (Steeler Str. 540 D-4300 Ess, Process for manufacturing a carbon catalyst.
Jntgen Harald (Essen DEX) Knoblauch Karl (Essen DEX) Richter Ekkehard (Essen DEX) Khl Helmut (Essen DEX), Process for producing an active carbon catalyst.
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