Provided are diesel exhaust components where palladium is segregated from a molecular sieve, specifically a zeolite, in a catalytic material. In the catalytic material, therefore, there are at least two layers: a palladium-containing layer that is substantially free of a molecular sieve and a hydroc
Provided are diesel exhaust components where palladium is segregated from a molecular sieve, specifically a zeolite, in a catalytic material. In the catalytic material, therefore, there are at least two layers: a palladium-containing layer that is substantially free of a molecular sieve and a hydrocarbon trap layer that comprises at least one molecular sieve and is substantially free of palladium. The palladium is provided on a high surface area, porous refractory metal oxide support. The catalytic material can further comprise a platinum component, where a minor amount of the platinum component is in the hydrocarbon trap layer, and a majority amount of the platinum component is in the palladium-containing layer. Systems and methods of using the same are also provided.
대표청구항▼
1. A layered diesel oxidation catalyst composite comprising: a diesel oxidation catalytic material on a carrier, the catalytic material comprising a palladium component in an amount in the range of 5 to 75 g/ft3 (0.18 to 2.65 kg/m3) and at least two layers:a hydrocarbon trap layer comprising at leas
1. A layered diesel oxidation catalyst composite comprising: a diesel oxidation catalytic material on a carrier, the catalytic material comprising a palladium component in an amount in the range of 5 to 75 g/ft3 (0.18 to 2.65 kg/m3) and at least two layers:a hydrocarbon trap layer comprising at least one molecular sieve, the hydrocarbon trap layer being substantially free of palladium; anda palladium-containing layer that comprises the palladium component, and is substantially free of a molecular sieve, wherein the palladium component is located on a high surface area, porous refractory metal oxide support, wherein the high surface area, porous refractory metal oxide support comprises alumina having a pore volume in the range of 0.5 to 1.5 cm3/g and an average pore diameter of at least 75 Å. 2. The layered catalyst composite of claim 1, wherein the catalytic material further comprises a platinum component, in the range of 10 g/ft3 to 150 g/ft3 (0.35 to 5.30 kg/m3), an amount of up to 20% by weight of the platinum component being incorporated into the at least one molecular sieve, and an amount of at least 80% by weight of the platinum component being on the high surface area, porous refractory metal oxide support of the palladium-containing layer. 3. The layered catalyst composite of claim 1, wherein the high surface area, porous refractory metal oxide support comprises a compound that is activated, stabilized, or both selected from the group consisting of alumina, zirconia, silica, titania, silica-alumina, zirconia-alumina, titania-alumina, lanthana-alumina, lanthana-zirconia-alumina, baria-alumina, baria-lanthana-alumina, baria-lanthana-neodymia-alumina, zirconia-silica, titania-silica, and zirconia-titania. 4. The layered catalyst composite of claim 1, wherein the average pore diameter in the range of 75 Å to 150 Å. 5. The layered catalyst composite of claim 1, wherein the molecular sieve comprises a zeolite that comprises a beta-zeolite, ZSM-5, zeolite-Y or combinations thereof. 6. The layered catalyst composite of claim 5, wherein the zeolite comprises a silica to alumina ratio in the range of 20:1 to 1000:1. 7. The layered catalyst composite of claim 5, wherein the high surface area, porous refractory metal oxide support comprises alumina having a surface area in the range of 80 to 200 m2/g, a pore volume in the range of 0.6 to 1.0 cm3/g, and an average pore diameter in the range of 70 Å to 150 Å, and wherein the zeolite comprises a beta zeolite into which the amount of at least 10% by weight of the platinum component is incorporated. 8. The layered catalyst composite of claim 1 having a total precious metal component loading in an amount in the range of 15 to 225 g/ft3 (0.53 to 7.95 kg/m3). 9. A method of treating a gaseous exhaust stream of a diesel engine, the exhaust stream including hydrocarbons, carbon monoxide, and other exhaust gas components, the method comprising: contacting the exhaust stream with the diesel oxidation catalyst composites of claim 1. 10. The method of claim 9, wherein the catalytic material further comprises a platinum component, in the range from 10 g/ft3 to 150 g/ft3 (0.35 to 5.30 kg/m3), an amount of up to 10% by weight of the platinum component being incorporated into the at least one molecular sieve, and an amount of at least 90% by weight of the platinum component being on the high surface area, porous refractory metal oxide support of the palladium-containing layer. 11. The method of claim 10, wherein the high surface area, porous refractory metal oxide support comprises alumina having a surface area in the range of 60 to 200 m2/g, a pore volume in the range of 0.6 to 1.0 cm3/g, and an average pore diameter is in the range of 70 Å to 150 Å, and wherein the molecular sieve comprises a zeolite that comprises a beta zeolite into which the amount of at least 10% by weight of the platinum component is incorporated. 12. The method of claim 10, further comprising directing the diesel exhaust gas stream one or more to a soot filter located downstream of the diesel oxidation catalyst composite and a selective catalytic reduction (SCR) catalytic article located upstream or downstream of the catalyzed soot filter (CSF). 13. A system for treatment of a diesel engine exhaust stream including hydrocarbons, carbon monoxide, and other exhaust gas components, the emission treatment system comprising: an exhaust conduit in fluid communication with the diesel engine via an exhaust manifold;the diesel oxidation catalyst composite of claim 1 wherein the carrier is a flow through substrate or a wall-flow substrate; andone or more of the following in fluid communication with the composite: a soot filter, a selective catalytic reduction (SCR) catalytic article and a NOx storage and reduction (NSR) catalytic article. 14. A layered diesel oxidation catalyst composite comprising: a diesel oxidation catalytic material on a carrier, the catalytic material comprising a palladium component in an amount in the range of 5 to 75 g/ft3 (0.18 to 2.65 kg/m3) and at least two layers:a hydrocarbon trap layer comprising at least one molecular sieve, the hydrocarbon trap layer being substantially free of palladium; andan undercoat layer located on the carrier and below the at least two layers, the undercoat layer comprising a high surface area refractory metal oxide. 15. A layered diesel oxidation catalyst composite comprising: a diesel oxidation catalytic material on a carrier, the catalytic material comprising a palladium component in an amount in the range of 5 to 75 g/ft3 (0.18 to 2.65 kg/m3) and at least two layers:a hydrocarbon trap layer comprising at least one molecular sieve, the hydrocarbon trap layer being substantially free of palladium; anda palladium-containing layer that comprises the palladium component, and is substantially free of a molecular sieve, wherein the palladium-containing layer is located on the carrier and the hydrocarbon trap layer is located on the palladium-containing layer. 16. The layered catalyst of claim 15, further comprising an undercoat layer wherein the palladium component in the catalytic material is present in the amount of about 40 g/ft3, the palladium-containing layer comprises 100% of the palladium component in the catalytic material and gamma alumina having a single point adsorption total pore volume about 0.85 cm3/g and an average BET pore diameter of about 100 Å, wherein the palladium-containing layer further comprises platinum, and the hydrocarbon trap layer comprises beta-zeolite, gamma alumina, and platinum. 17. A layered diesel oxidation catalyst composite comprising: a diesel oxidation catalytic material on a carrier, the catalytic material comprising a palladium component in an amount in the range of 5 to 75 g/ft3 (0.18 to 2.65 kg/m3) and at least two layers:a hydrocarbon trap layer comprising at least one molecular sieve, the hydrocarbon trap layer being substantially free of palladium; anda palladium-containing layer that comprises the palladium component, and is substantially free of a molecular sieve, wherein the palladium component is located on a high surface area, porous refractory metal oxide support, wherein the high surface area, porous refractory metal oxide support comprises alumina having a surface area in the range of 80 to 200 m2/g, a pore volume in the range of 0.5 to 1.0 cm3/g, and an average pore diameter of at least 75 Å, wherein the molecular sieve comprises a zeolite and a platinum component, and wherein the zeolite comprises a beta zeolite into which the amount of at least 10% by weight of the platinum component is incorporated. 18. The layered catalyst of claim 17, wherein the average pore diameter is in the range of 75 Å to 150 Å.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (31)
Ohno,Kazushige; Taoka,Noriyuki; Komori,Teruo; Hasegawa,Akira; Kakuta,Noriyoshi, Catalyst and method for preparation thereof.
Patil Mallanagouda D. (Corning NY) Socha ; Jr. Louis S. (Painted Post NY) Lachman Irwin M. (Corning NY), Dual converter engine exhaust system for reducing hydrocarbon emissions.
Burk Patrick Lee ; Hochmuth John Karl ; Dettling Joseph Charles ; Heck Ronald Marshall ; Steger John Joseph ; Tauster Samuel Jack, Method and apparatus for treating an engine exhaust gas stream.
Dettling Joseph C. (Jackson NJ) Mooney John J. (Wyckoff NJ) Skomoroski Robert M. (Paterson NJ) Hindin Saul G. (Mendham NJ), Monolithic catalyst member and support therefor.
Voss Kenneth E. (Somerville NJ) Yavuz Bulent O. (Plainfield NJ) Farrauto Robert J. (Westfield NJ) Galligan Michael P. (Clark NJ), Oxidation catalyst with bulk ceria, a second bulk metal oxide, and platinum.
Speronello Barry K. (Belle Mead NJ) Byrne John W. (Edison NJ) Chen James M. (Edison NJ), Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same.
Gunugunuri, Krishna Reddy; Peck, Torin C.; Ling, Chen; Jia, Hongfei, Catalyst for direct NOx decomposition and a method of forming and using the catalyst.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.