Claims
- 1. A catalyst support comprising a honeycomb body composed of a porous ceramic material, and including a plurality of parallel cell channels traversing the body from a frontal inlet end to an outlet end thereof:
wherein the porous ceramic material is defined by a total porosity greater than 45 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 30 micrometers, whereby a higher catalyst loading can be achieved on the support substrate, without a pressure drop penalty.
- 2. The catalyst support of claim 1 wherein the porous ceramic material has total porosity greater than 50 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 20 micrometers.
- 3. The catalyst support of claim 2 wherein the porous ceramic material has total porosity greater than 55 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 15 micrometers.
- 4. The catalyst support of claim 1 further having a mean coefficient of thermal expansion at 25-800° C. of less than 15×10−7/° C.
- 5. The catalyst support of claim 4 wherein the mean coefficient of thermal expansion at 25-800° C. of less than 10×10−7/° C.
- 6. The catalyst support of claim 5 wherein the mean coefficient of thermal expansion at 25-800° C. of less than 7×10−7/° C.
- 7. The catalyst support of claim 1 wherein the ceramic material is selected from the group consisting of titanates, silicates, aluminates, lithium aluminosilicates, carbides, nitrides, borides.
- 8. The catalyst support of claim 7 wherein the ceramic material is a silicate.
- 9. The catalyst support of claim 8 wherein the ceramic material is a silicate approximating the stoichiometry Mg2Al4Si5O18.
- 10. A cordierite substrate for use as a support of SCR and NOx adsorber catalysts, and having a mean coefficient of thermal expansion at 25-800° C. of less than 15×10−7/° C., a total porosity greater than 45 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 20 micrometers.
- 11. The cordierite substrate of claim 10 wherein the mean coefficient of thermal expansion at 25-800° C. of less than 10×10−7/° C.
- 12. The cordierite substrate of claim 11 wherein the mean coefficient of thermal expansion at 25-800° C. of less than 7×10−7/° C.
- 13. The cordierite substrate of claim 10 wherein the porous ceramic material has total porosity greater than 50 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 15 micrometers.
- 14. The cordierite substrate of claim 13 wherein the porous ceramic material has total porosity greater than 55 vol. %, and a network of interconnected pores with a narrow pore size distribution of pores having a median pore size greater than 5 micrometers but less than 15 micrometers.
- 15. The cordierite substrate of claim 10 having a honeycomb body having a frontal inlet end and an outlet end, and a plurality of parallel cell channels extending therebetween.
- 16. The cordierite substrate of claim 15 having a cell density of 100 cells/in2 (15.5 cells/cm2) to 900 cells/in2 (141 cells/cm2).
- 17. The cordierite substrate of claim 16 wherein the cell density is 400 cells/in (62 cells/cm2) to 600 cells/in2 (94 cells/cm2).
- 18. The cordierite substrate of claim 17 having a wall thickness of 0.004 in. (0.10 mm) to 0.020 in. (0.50 mm).
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application No. 60/443,609, filed Jan. 30, 2003, entitled “Support for Selective Reduction Catalyst”, by Cutler et al.
Provisional Applications (1)
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Number |
Date |
Country |
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60443609 |
Jan 2003 |
US |