Cordierite filters with reduced pressure drop

Details Cordierite filters with reduced pressure drop Cordierite filters with reduced pressure drop

2007-02-20

2007-02-20

Greene, Jason M. (Department: 1724)

Gas separation

Specific media material

Ceramic or sintered

C055S282200, C055S282300, C055S385300, C055SDIG010, C055SDIG030, C060S311000

Reexamination Certificate

active

10607249

ABSTRACT:
A diesel particulate filter comprising a plugged, wall-flow honeycomb filter body composed of cordierite and having a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein the filter exhibits a CTE (25–800° C.) of less than 13×10−7/° C., a bulk filter density of less than 0.60 g/cm3, a median pore diameter, d50, of less than 25 micrometers, a porosity and pore size distribution that satisfy the relationship Pm≦3.75, wherein Pmis equal to 10.2474{1/[(d50)2(% porosity/100)]}+0.0366183(d90)−0.00040119(d90)2+0.468815(100/% porosity)2+0.0297715(d50)+1.61639(d50−d10)/d50, wherein d10, and d90are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d10<d50<d90. A method of making the same is also provided.

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Hashimoto et al., ,“SiC and Cordierite Diesel Particulate Filters Designed for Low Pressure Drop and Catalyzed, Uncatalyzed Systems,” SAE Technical Paper 2002-01-0322, p. 1-14.
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