Filter comprising combined soot oxidation and NH3-SCR catalyst
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/94
B01J-035/04
B01J-023/30
B01J-023/83
B01J-023/888
B01J-037/00
C04B-035/50
C04B-035/634
C04B-035/636
C04B-035/80
C04B-035/82
C04B-038/00
B01J-029/74
B01J-029/78
F01N-003/035
C04B-111/00
출원번호
US-0384572
(2011-02-01)
등록번호
US-9283519
(2016-03-15)
국제출원번호
PCT/GB2011/050170
(2011-02-01)
§371/§102 date
20120117
(20120117)
국제공개번호
WO2011/092525
(2011-08-04)
발명자
/ 주소
Collier, Jillian Elaine
Dotzel, Ralf
Laroze, Sylvie Cécile
Leppelt, Rainer
Millington, Paul James
Münch, Jörg Werner
Rajaram, Raj Rao
Schedel, Hubert
출원인 / 주소
Johnson Matthey Public Limited Company
대리인 / 주소
RatnerPrestia
인용정보
피인용 횟수 :
1인용 특허 :
22
초록▼
A wall-flow filter for filtering particulate matter from a flowing exhaust gas comprises a catalyst for catalyzing both the conversion of solid carbon in the particulate matter by oxygen and the selective reduction of oxides of nitrogen in the exhaust gas with a nitrogenous reductant, which catalyst
A wall-flow filter for filtering particulate matter from a flowing exhaust gas comprises a catalyst for catalyzing both the conversion of solid carbon in the particulate matter by oxygen and the selective reduction of oxides of nitrogen in the exhaust gas with a nitrogenous reductant, which catalyst comprising optionally stabilized ceria and at least one metal selected from (i) tungsten and (ii) both tungsten and iron.
대표청구항▼
1. A method of treating exhaust gas emissions from internal combustion engines and having oxides of nitrogen and soot, which method comprising passing the exhaust gas through a wall-flow filter in the presence of a nitrogenous reductant, which filter comprising a layer of catalyst coated on an inert
1. A method of treating exhaust gas emissions from internal combustion engines and having oxides of nitrogen and soot, which method comprising passing the exhaust gas through a wall-flow filter in the presence of a nitrogenous reductant, which filter comprising a layer of catalyst coated on an inert filter substrate, and catalysing soot combustion by oxygen and selective reduction of oxides of nitrogen,the steps of catalyzing soot combustion by oxygen and selective reduction of oxides of nitrogen each consisting of contacting the exhaust gas to the layer of the catalyst,the catalyst comprises ceria that is optionally stabilised and at least one metal selected from (i) tungsten and (ii) both tungsten and iron. 2. A method according to claim 1 further comprising injecting the nitrogenous reductant with an injector means into the exhaust gas, wherein the wall-flow filter is disposed downstream of the injector means. 3. A method according to claim 2, wherein the catalyst has a total metal content from 5 to 15% by weight. 4. A method according to claim 2, wherein the porosity of the wall-flow filter is from 30-80%. 5. A method according to claim 2 further comprising oxidising nitric oxide in the exhaust gas to nitrogen dioxide with an oxidation catalyst disposed upstream of the injector means. 6. A method according to claim 2, wherein the ceria of the catalyst is stabilised with a ceria stabiliser and the ceria stabiliser is selected from the group consisting of zirconium, lanthanides and mixtures of any two or more thereof. 7. A method according to claim 6, wherein the ceria stabiliser is a lanthanide selected from the group consisting of La, Nd, Pr, Gd, and mixtures of any two or more thereof. 8. A method according to claim 6, wherein the ceria is stabilised with zirconia, and the catalyst has a weight ratio of zirconia:ceria greater than 0:1 and less than or equal to 9:1. 9. A method according to claim 8, wherein the weight ratio of zirconia:ceria is 1:4 to 4:1. 10. A method according to claim 2, wherein the catalyst further comprises alumina stabilised with a stabiliser selected from the group consisting of silicon, zirconium, barium, lanthanides and mixtures of any two or more thereof. 11. A method according to claim 10, wherein the stabiliser is a lanthanide selected from the group consisting of La, Ce, Nd, Pr, Gd, and mixtures of any two or more thereof. 12. A method according to claim 1, wherein the ceria is stabilised with a ceria stabiliser and the ceria stabiliser is selected from the group consisting of zirconium, lanthanides and mixtures of any two or more thereof. 13. A method according to claim 12, wherein the ceria stabiliser is a lanthanide selected from the group consisting of La, Nd, Pr, Gd, and mixtures of any two or more thereof. 14. A method according to claim 1, wherein the ceria is stabilised with zirconia, and the catalyst has a weight ratio of zirconia:ceria greater than 0:1 and less than or equal to 9:1. 15. A method according to claim 14, wherein the weight ratio of zirconia:ceria is 1:4 to 4:1. 16. A method according to claim 1, wherein the total metal content of the catalyst is from 5 to 15% by weight. 17. A method according to claim 1, wherein the porosity of the wall-flow filter is from 30-80%. 18. A method according to claim 1, wherein the catalyst further comprises alumina stabilised with a stabiliser selected from the group consisting of silicon, zirconium, barium, lanthanides and mixtures of any two or more thereof.
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이 특허에 인용된 특허 (22)
Pereira Carmo J. (Columbia MD) Hegedus Louis (Rockville MD) Maselli James M. (Columbia MD), Catalyst with high geometric surface area.
Kharas Karl C. C. ; Robota Heinz J., Catalytic converter having a catalyst with noble metal on molecular sieve crystal surface and method of treating diesel.
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.
Li, Hong-Xin; Cormier, William E.; Moden, Bjorn, Microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure and methods of making and using same.
Lachman Irwin M. (Corning NY) Patil Mallanagouda D. (Corning NY) Socha ; Jr. Louis S. (Painted Post NY) Swaroop Srinivas H. (Painted Post NY) Wusirika Raja R. (Painted Post NY), Molecular sieve-palladium-platinum catalyst on a substrate.
Lachman Irwin M. (Corning NY) Patil Mallanagouda D. (Corning NY) Socha ; Jr. Louis S. (Painted Post NY) Swaroop Srinivas H. (Painted Post NY) Wusirika Raja R. (Painted Post NY), Process for removal of hydrocarbons carbon manoxide, and oxides of nitrogen from oxygen-containing waste gas using molec.
Strehlau, Wolfgang; Gerlach, Olga; Maier, Jürgen, Process for the removal of harmful substances from exhaust gases of combustion engines and catalyst for carrying out said process.
Chang Clarence D. (Princeton NJ) Santiesteban Jose G. (Yardley PA) Shihabi David S. (Pennington NJ) Stevenson Scott A. (Langhorne PA) Vartuli James C. (Westchester PA), Selective catalytic reduction of nitrogen oxides.
Southward, Barry W. L.; Nunan, John G., ZrOx, Ce-ZrOx, Ce-Zr-REOx as host matrices for redox active cations for low temperature, hydrothermally durable and poison resistant SCR catalysts.
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