Claims
- 1. A catalyst, comprising:
a catalytic metal component; and a macro-pore component comprising an oxygen storage component and an aluminum oxide component, wherein the oxygen storage component, the aluminum oxide component, or both comprise pores, and wherein greater than or equal to about 40% of a macro-pore component pore volume, based on a total macro-pore component pore volume, is associated with pores greater than 120 Å in diameter.
- 2. The catalyst of claim 1, wherein greater than or equal to about 40% of the macro-pore component pore volume is associated with pores greater than 120 Å to about 1,000 Å in diameter.
- 3. The catalyst of claim 2, wherein greater than or equal to about 40% of the macro-pore component pore volume is associated with pores that are about 180 Å to about 800 Å in diameter.
- 4 The catalyst of claim 1, wherein greater than or equal to about 50% of the macro-pore component pore volume is associated with pores that are greater than 120 Å to about 1,000 Å in diameter.
- 5. The catalyst of claim 4, wherein greater than or equal to about 80% of the macro-pore component pore volume is associated with pores that are greater than 120 Å to about 1,000 Å in diameter.
- 6. The catalyst of claim 5, wherein greater than or equal to about 80% of the macro-pore component pore volume is associated with pores that are about 180 Å to about 800 Å in diameter.
- 7. The catalyst of claim 4, wherein greater than or equal to about 50% of the macro-pore component pore volume is associated with pores that are about 180 Å to about 800 Å in diameter.
- 8. The catalyst of claim 1, wherein greater than or equal to about 40% of an aluminum oxide pore volume, based on a total aluminum oxide pore volume, is associated with pores that are about 220 Å to about 800 Å in diameter.
- 9. The catalyst of claim 8, wherein at least about 50% of the aluminum oxide pore volume, based on the total aluminum oxide pore volume is associated with pores that are about 220 Å to about 800 Å in diameter.
- 10. The catalyst of claim 9, wherein at least about 80% of the aluminum oxide pore volume, based on the total aluminum oxide pore volume, is associated with pores that are about 220 Å to about 800 Å in diameter.
- 11. The catalyst of claim 1, wherein at least about 40% of an oxygen storage component pore volume, based on a total oxygen storage component pore volume is associated with pores that are about 200 Å to about 800 Å in diameter.
- 12. The catalyst of claim 11, wherein at least about 50% of the oxygen storage component pore volume, based on the total oxygen storage component pore volume, is associated with pores that are about 200 Å to about 800 Å in diameter.
- 13. The catalyst of claim 12, wherein at least about 80% of the oxygen storage component pore volume, based on the total oxygen storage component pore volume, is associated with pores that are about 200 Å to about 800 Å in diameter.
- 14. The catalyst of claim 1, wherein the catalytic metal component, the oxygen storage component, and the aluminum oxide component are disposed as a layer on a substrate.
- 15. The catalyst of claim 14, wherein the layer is about 20 micrometers to about 170 micrometers thick.
- 16. The catalyst of claim 14, further comprising a plurality of layers disposed on the substrate.
- 17. The catalyst of claim 1, wherein the catalytic metal component comprises palladium.
- 18. The catalyst of claim 1, wherein the catalytic metal component comprises platinum.
- 19. The catalyst of claim 17, wherein the catalytic metal component comprises rhodium.
- 20. The catalyst of claim 1, wherein the aluminum oxide has a surface area of greater than or equal to about 40 square meters per gram.
- 21. The catalyst of claim 1, wherein the oxygen storage component has a surface area of greater than or equal to about 20 square meters per gram.
- 22. A method for treating an exhaust gas, comprising:
contacting the exhaust gas with a catalyst at a temperature and for a period of time sufficient to reduce the concentration of a material in the exhaust gas, wherein the catalyst comprises
a catalytic metal component; and a macro-pore component, wherein the macro-pore component comprises an oxygen storage component, and an aluminum oxide component, and wherein at least one of the oxygen storage components and the aluminum oxide components comprise pores, and wherein greater than or equal to about 40% of a macro-pore component pore volume, based on a total macro-pore component pore volume, is associated with pores that are greater than 120 Å in diameter.
- 23. An emission control device, comprising:
a substrate comprising a catalyst, wherein the catalyst comprises
a catalytic metal component; and a macro-pore component comprising an oxygen storage component and an aluminum oxide component, wherein the oxygen storage component, the aluminum oxide component, or both comprise pores, and wherein greater than or equal to about 40% of a macro-pore component pore volume, based on a total macro-pore component pore volume, is associated with pores greater than 120 Å in diameter; a housing disposed around the substrate; and a retention material disposed between the housing and the substrate.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of the U.S. Provisional Application Serial No. 60/355,562 filed Feb. 6, 2002, which is incorporated herein in its entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60355562 |
Feb 2002 |
US |