Mullite-aluminum titanate diesel exhaust filter

Details Mullite-aluminum titanate diesel exhaust filter Mullite-aluminum titanate diesel exhaust filter

2005-02-01

2005-02-01

Kim, John (Department: 1723)

Liquid purification or separation

Filter

Material

C055S523000, C055SDIG003, C210S503000, C501S080000, C501S127000, C501S128000, C501S134000, C501S153000, C502S439000, C502S527190

Reexamination Certificate

active

06849181

ABSTRACT:
The invention is directed at a mullite-aluminum titanate porous diesel particulate filter constituting a porous ceramic body containing, expressed in terms of weight percent of the total body, of 60-90%, preferably 70-80%, most preferably 70% iron-aluminum titanate solid solution having a stoichiometry of Al2(1−x)Fe2xTiO5, where x is 0-0.1, and 10-40%, preferably 20-30%, most preferably 30% mullite (3Al2O3.2SiO2), and consists essentially, expressed in terms of weigh percent on the oxide basis, of 3 to 15% SiO2, 55 to 65% Al2O3, 22 to 40% TiO2, and 0 to 10% Fe2O3, and being useful for filtration of diesel exhaust. The inventive diesel particulate filter exhibits high interconnected open porosity and large median pore size, in combination with high permeability when fired to a temperature of between 1650° to 1700° C., along with high thermal shock resistance and good filtration capability.

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Lachman et al, “High Temperature Monolithic Supports for Automobile Exhaust Catalysis”, Ceram Eng.Sci.Proc (1981),2 (5-6) pp. 337-351.
Fukuda et al., Pub. No. US2003/0015829, Jan. 23, 2003.

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