Method of making wall-flow monolith filter

Details Method of making wall-flow monolith filter Method of making wall-flow monolith filter

2005-01-11

2005-01-11

Smith, Duane (Department: 1724)

Gas separation

Specific media material

Ceramic or sintered

C055S524000, C055SDIG005, C055SDIG003, C060S311000, C156S089220, C264S628000, C264S630000, C264S643000, C264SDIG004, C427S243000, C427S244000, C427S245000

Reexamination Certificate

active

06840976

ABSTRACT:
A ceramic honeycomb wall-flow filter is prepared by plugging channels in a clay containing ceramic honeycomb by a method that has the following steps. First, a mixture of a dispersing liquid and ceramic powder is formed. Second, the mixture is inserted into at least one channel of a clay containing green ceramic honeycomb to form a plugged green ceramic honeycomb wherein the dispersing liquid essentially fails to swell the clay. Alternatively, the mixture is inserted into a calcined ceramic honeycomb to form a plugged calcined ceramic honeycomb. Finally, the plugged green or calcined ceramic honeycomb is heated to a temperature sufficient to sinter the plugged green ceramic honeycomb to form a porous sintered plugged ceramic honeycomb. The method is particularly useful for simultaneously making the plugs and discriminating layers in the channels. In particular the method is useful to make wall-flow filters having plugs on at least one end with same composition as the discriminating layer or plugs on each end having different compositions.

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