Catalyst containing platinum and palladium for the selective reduction of NOx with hydrogen (H2-SCR)
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/56
B01D-053/94
B01J-008/02
C01B-021/00
C01B-023/00
C01B-025/00
C01B-031/00
C01B-033/00
C01B-035/00
출원번호
US-0578783
(2009-10-14)
등록번호
US-8114369
(2012-02-14)
우선권정보
EP-08018087 (2008-10-15)
발명자
/ 주소
Efstathiou, Angelos M.
Savva, Petros G.
Costa, Costas N.
출원인 / 주소
Linde Aktiengesellschaft
대리인 / 주소
Millen, White, Zelano & Branigan, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
31
초록▼
The invention relates to a novel catalyst having excellent activity and selectivity for reducing nitric oxides (NO/NO2) to nitrogen gas (N2) with hydrogen (H2) being used as a reducing agent under strongly oxidizing conditions (e.g., 2-10 vol % O2) (H2-SCR) in the 100-400° C. range, but in particula
The invention relates to a novel catalyst having excellent activity and selectivity for reducing nitric oxides (NO/NO2) to nitrogen gas (N2) with hydrogen (H2) being used as a reducing agent under strongly oxidizing conditions (e.g., 2-10 vol % O2) (H2-SCR) in the 100-400° C. range, but in particular to the low-temperature range 100-200° C. The inventive catalyst is a combination of platinum and palladium which are in contact with solid phases of a mixed MgO and CeO2 medium.
대표청구항▼
1. A catalyst comprising platinum in an amount between 0.01 and 2.0 wt %, and palladium in an amount between 0.01 and 2.0 wt %, and wherein both metals are dispersed on a mixed metal oxide support of magnesium and cerium. 2. A catalyst according to claim 1, wherein platinum and palladium are dispers
1. A catalyst comprising platinum in an amount between 0.01 and 2.0 wt %, and palladium in an amount between 0.01 and 2.0 wt %, and wherein both metals are dispersed on a mixed metal oxide support of magnesium and cerium. 2. A catalyst according to claim 1, wherein platinum and palladium are dispersed on the mixed metal oxide support comprising each of magnesium oxide and cerium dioxide having a mean primary crystal size less than 15 nm. 3. A catalyst according to claim 2 further comprising at least two components selected from the group consisting of Pt, Pt—Pd alloy, PtOx, PdO, MgO, and CeO2. 4. A catalyst according to claim 1, wherein the metal content is 0.1 wt % of platinum and 0.05 wt % of palladium dispersed on the mixed metal oxide support of magnesium and cerium. 5. A catalyst according to claim 1 comprising platinum and palladium supported on a mixed metal oxide of 50 wt % magnesium oxide and 50 wt % cerium dioxide. 6. A catalyst according to claim 1 further comprising at least two components selected from the group consisting of Pt, Pt—Pd alloy, PtOx, PdO, MgO, and CeO2. 7. A catalyst comprising noble metals platinum and palladium in an amount between 0.01 and 2.0 wt % for each noble metal, wherein both metals are dispersed on a mixed metal oxide support of magnesium oxide and cerium dioxide solids, prepared by a process comprising the steps of: impregnating the mixed metal oxide of magnesium and cerium with an aqueous solution containing platinum and palladium precursors,evaporating water, drying, grinding and heating the precursors at a sufficient temperature in air flow until complete conversion of the platinum and palladium precursors into their respective metal oxides, andreducing the catalyst at a sufficient reduction temperature for a sufficient time in H2 flow. 8. A catalyst according to claim 7, wherein platinum and palladium, are dispersed on magnesium oxide and cerium dioxide in a proportion 1:1 (w/w). 9. A catalyst according to claim 7, comprising magnesium oxide and cerium dioxide solids having primary crystal particles with mean diameters less than 15 nm. 10. A catalyst according to claim 9 comprising a preceding step of solution combustion with urea as a fuel and without the use of any other solvent to obtain nano-crystalline magnesium oxide and cerium dioxide support phases of less than 15 nm in size. 11. A catalyst according to claim 9 wherein platinum and palladium are dispersed as particles having a size less than 2 nm, in the mixed metal oxide. 12. A catalyst according to claim 7, wherein the mixed metal oxide of magnesium oxide and cerium dioxide is mixed in a first step with an aqueous solution containing only one noble metal from platinum and palladium precursors followed by steps of the evaporation of water, drying, grinding and heating at a sufficient temperature in air flow until complete conversion of the platinum or palladium precursor into the respective metal oxide, which is followed by the impregnation of the resulting solid material in a second step with an aqueous solution containing only that noble metal not used in the first step and by the same evaporation, drying, grinding and heating steps. 13. A catalyst according to claim 7 wherein platinum and palladium are dispersed as particles having a size less than 2 nm, in the mixed metal oxide. 14. A catalyst according to claim 7 comprising a preceding step of solution combustion with urea as a fuel and without the use of any other solvent to obtain nano-crystalline magnesium oxide and cerium dioxide support phases of less than 15 nm in size. 15. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen the improvement wherein the catalyst is according to claim 1. 16. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen, using a catalyst, the improvement wherein the catalyst is according to claim 2. 17. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen, using a catalyst, the improvement wherein the catalyst is according to claim 7. 18. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen, using a catalyst, the improvement wherein the catalyst is according to claim 9. 19. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen, using a catalyst, the improvement wherein the catalyst is according to claim 9. 20. In a catalytic process for the reduction of a chemical compound selected from the group consisting of NO, NO2 and/or a mixture of NO and NO2 to N2 gas, optionally with hydrogen as reducing agent, in the presence or absence of oxygen, using a catalyst, the improvement wherein the catalyst is according to claim 10.
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