Porous ceramic article for use as a filter for removing particulates from diesel exhaust gases
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United States of America Patent
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-
Dec 11, 1990
Issued Date -
N/A
app pub date -
Sep 8, 1989
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filtering element for use in trapping particulates from a diesel exhaust gas, made up of a porous refractory ceramic body of predominant open-cell porosity prepared by firing an aluminosilicate hydrogel-bonded porous ceramic composition, and preferably further containing on the filter inlet and/or outlet surface thereof an integral thin porous ceramic membrane layer having pores whose average diameter is less than that of the pores in the body and at the other surfaces.
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