Catalytic reduction of NOx with high activity catalysts
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/56
B01D-053/81
출원번호
US-0938590
(2013-07-10)
등록번호
US-8834823
(2014-09-16)
발명자
/ 주소
Dandekar, Ajit B.
Socha, Richard F.
Eckes, Richard L.
Waldrup, S. Beau
출원인 / 주소
ExxonMobil Research and Engineering Company
대리인 / 주소
Barrett, Glenn T.
인용정보
피인용 횟수 :
0인용 특허 :
15
초록▼
Methods and systems for selective catalytic reduction of NOx with an activated-carbon-supported metal catalyst at an operating temperature of between about between about 500° C. and about 750° C. An exhaust stream including NOx is introduced to a catalytic reactor having the activated-carbon-support
Methods and systems for selective catalytic reduction of NOx with an activated-carbon-supported metal catalyst at an operating temperature of between about between about 500° C. and about 750° C. An exhaust stream including NOx is introduced to a catalytic reactor having the activated-carbon-supported metal catalyst for NOx reduction of at least 90%. A second catalyst reactor can be provided downstream to remove or convert nitrous oxide as desired.
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 to a catalytic reactor comprising at least one activated-carbon-supported meta
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 to a catalytic reactor comprising at least one activated-carbon-supported metal catalyst, the operating temperature of the catalytic reactor being between about 500° C. and about 750° C. 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 is free of an effective amount of fluid reductant. 3. 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. 4. The method of claim 3, wherein the catalytic reactor is located near a flue of the at least one refinery component to maintain the catalytic reactor between about 500° C. and 750° C. 5. The method of claim 1, wherein the operating temperature of the catalytic reactor is maintained between about 500 ° C. and about 750° C. by heating the exhaust stream. 6. The method of claim 1, wherein the exhaust stream includes between about 1% and about 20% oxygen and between about 1% and about 10% water. 7. The method of claim 1, wherein the exhaust stream has a gaseous hourly space velocity of at least about 5000 cc per hour. 8. The method of claim 1, wherein the exhaust stream has a gaseous hourly space velocity between about 30K cc per hour and about 120K cc per hour. 9. The method of claim 1, wherein the activated-carbon-supported metal catalyst includes a transition metal. 10. The method of claim 1, wherein the activated-carbon-supported metal catalyst includes a noble metal. 11. The method of claim 1, wherein the activated-carbon-supported metal catalyst includes a Group 10 element. 12. The method of claim 1, wherein the activated-carbon-supported metal catalyst includes one of the group consisting of platinum, ruthenium, cobalt, rhenium, iron, nickel, palladium, and copper. 13. The method of claim 1, wherein the amount of NOx is reduced by at least 90%. 14. The method of claim 1, further comprising reducing an amount of N2O in the NOx-reduced exhaust stream. 15. The method of claim 14, wherein reducing the amount of N2O comprises introducing the at least a portion of the NOx-reduced exhaust stream to a second catalyst. 16. The method of claim 15, wherein a fluid reductant stream including ammonia is introduced into the NOx-reduced exhaust stream upstream of the second catalyst. 17. The method of claim 15, wherein the catalytic reactor includes a vessel and the second catalyst is within the vessel of the catalytic reactor. 18. The method of claim 15, wherein the second catalyst is in a second catalytic reactor, the second catalytic reactor located downstream of the catalytic reactor. 19. The method of claim 15, wherein the second catalyst comprises a zeolite loaded with a metal. 20. The method of claim 15, wherein the second catalyst comprises Cu loaded on ZSM-5. 21. The method of claim 15, wherein the operating temperature of the second catalyst is between about 200° C. and about 250° C. 22. 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 heat exchanger operatively coupled to the conduit to heat the exhaust stream to maintain the catalytic reactor at between about 500° C. and about 750° C.;a catalytic reactor in fluid communication with the conduit, the catalytic reactor comprising at least one activated-carbon-supported metal catalyst, the operating temperature of the catalytic reactor being between about 500° C. and about 750° C. to reduce the amount of NOx in the exhaust stream; andan outlet in fluid communication with the catalytic reactor to direct the NOx reduced exhaust stream from the catalytic reactor. 23. The system of claim 22, 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. 24. The system of claim 22, wherein the at least one activated-carbon-supported metal catalyst includes a noble metal selected from platinum, ruthenium, rhenium, or palladium. 25. 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 catalytic reactor in fluid communication with the conduit, the catalytic reactor comprising at least one activated-carbon-supported noble metal catalyst, the operating temperature of the catalytic reactor being between about 500° C. and about 750° C. to reduce the amount of NOx in the exhaust stream; andan outlet in fluid communication with the catalytic reactor to direct the NOx reduced exhaust stream from the catalytic reactor. 26. 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 catalytic reactor in fluid communication with the conduit, the catalytic reactor comprising at least one activated-carbon-supported metal catalyst, the operating temperature of the catalytic reactor being between about 500° C. and about 750° C. to reduce the amount of NOx in the exhaust stream; andan outlet in fluid communication with the catalytic reactor to direct the NOx reduced exhaust stream from the catalytic reactor;a second catalyst in fluid communication with the outlet and operatively configured to reduce an amount of nitrous oxide in the NOx-reduced exhaust stream. 27. The system of claim 26, further comprising a source of a fluid reductant stream including ammonia operatively configured to introduce the reductant stream upstream from the second catalyst. 28. The system of claim 27, wherein the catalytic reactor includes a vessel and the second catalyst is within the vessel of the catalytic reactor. 29. The system of claim 27, wherein the second catalyst is in a second catalytic reactor, the second catalytic reactor located downstream from the catalytic rector. 30. The system of claim 26, wherein the second catalyst comprises a zeolite loaded with a metal. 31. The system of claim 26, wherein the second catalyst comprises Cu loaded on ZSM-5. 32. The system of claim 26, wherein the second catalyst is located downstream from the catalytic reactor to maintain the operating temperature of the second catalyst is between about 200° C. and about 250° C. 33. The system of claim 26, further comprising a heat exchanger operatively coupled to heat the NOx-reduced exhaust stream to maintain the second catalyst at between about 200° C. and about 250° C.
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