IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0899749
(2004-07-27)
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등록번호 |
US-7378069
(2008-05-27)
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발명자
/ 주소 |
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출원인 / 주소 |
- Los Alamos National Security, LLC
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
15 |
초록
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A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then
A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO2, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N2O was not detected (detection limit: 0.6 percent N2O).
대표청구항
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What is claimed is: 1. A method for the Selective Catalytic Reduction of nitrogen oxides in an exhaust gas stream comprising nitrogen oxides, ammonia, and oxygen, comprising contacting the exhaust gas stream with a catalyst under conditions effective to catalytically reduce the nitrogen oxides such
What is claimed is: 1. A method for the Selective Catalytic Reduction of nitrogen oxides in an exhaust gas stream comprising nitrogen oxides, ammonia, and oxygen, comprising contacting the exhaust gas stream with a catalyst under conditions effective to catalytically reduce the nitrogen oxides such that no more than 0.6 percent N2O remains, the catalyst comprising a medium pore zeolite, the zeolite being ion exchanged with iron and impregnated with manganese and cerium. 2. The method of claim 1, wherein the catalyst is characterized as having sufficient catalytic activity to reduce the nitrogen oxides in a gas mixture comprising about 4 parts NO to about 1 part NO2 by about 80 percent at a temperature of about 113 degrees Celsius, and by about 94 percent at a temperature of about 147 degrees Celsius. 3. The method of claim 1, wherein the medium pore zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-21, ZSM-22, ZSM-23, ZSM-35, ZSM-38, ZSM-48, ZSM-57, and ZSM-58. 4. The method of claim 1, wherein the medium pore zeolite comprises ZSM-5. 5. The method of claim 1, wherein the medium pore zeolite is supported on a monolith. 6. The method of claim 1, wherein the medium pore zeolite is supported on cordierite. 7. A method for catalytically reducing nitrogen oxides in an exhaust gas stream containing nitrogen oxides, ammonia, and oxygen comprising contacting the exhaust gas stream under conditions effective to catalytically reduce the nitrogen oxides with a first catalyst comprising Fe-ZSM-5 and thereafter with a second catalyst comprising a medium pore zeolite ion exchanged with iron and impregnated with manganese and cerium. 8. The method of claim 7, wherein the second catalyst is characterized as having sufficient catalytic activity so as to reduce the nitrogen oxides in a 4 to 1 mixture of NO to NO2, respectively, by about 80 percent at a temperature of about 113 degrees Celsius, and by about 94 percent at a temperature of about 147 degrees Celsius when the exhaust gas comprises oxygen and nitrogen oxides comprising NO and NO2 in a ratio of about 4 to 1. 9. The method of claim 7, wherein the medium pore zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-21, ZSM-22, ZSM-23, ZSM-35, ZSM-38, ZSM-48, ZSM-57, and ZSM-58. 10. The method of claim 7, wherein the medium pore zeolite comprises ZSM-5. 11. The method of claim 7, wherein the Fe-ZSM-5 and the second catalyst are supported on a monolith.
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