| 摘要 |
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) (22), 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 invention diesel particulate filter exhibits highly 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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