Honeycomb filter and exhaust gas purifying apparatus

Details Honeycomb filter and exhaust gas purifying apparatus Honeycomb filter and exhaust gas purifying apparatus

2011-07-19

2011-07-19

Duong, Tom (Department: 1774)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S177000

Reexamination Certificate

active

07981370

ABSTRACT:
A honeycomb filter includes a pillar-shaped honeycomb fired body having cells longitudinally disposed with a cell wall and having first and second end faces on gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering at least about 25% and at most about 90% of an overall length of the fired body and that abuts the first end face. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length that abuts the second end face. A thermal conductivity of the non-catalyst-supporting area is larger than that of the catalyst-supporting-layer area, where gas permeability coefficient k1 (μm2) of a cell wall in the non-catalyst-supporting-layer area and gas permeability coefficient k2 (μm2) of a cell wall in the catalyst-supporting-layer area satisfy inequalities, (k1−k2)≦about 0.5 and about 1.0≦k1≦about 1.5.

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