Porous ceramic honeycomb filter

Details Porous ceramic honeycomb filter Porous ceramic honeycomb filter

1994-12-12

1996-08-13

Woo, Jay H.

Gas separation

Specific media material

Ceramic or sintered

55DIG30, 428116, 428188, B01D 3920, C04B 3800

Patent

active

055452434

ABSTRACT:
A porous ceramic filter has properties such that a porosity of the filter is more than 45% and less than 60%, a volume of pores having a pore size of less than 40 .mu.m is more than 60% of total volume of pores of the ceramic filter and an inequality of 1000M+85N.gtoreq.530 is satisfied, wherein M (m.sup.2 /g) is a specific surface of total pores continued from a surface to an inner portion of the filter and N (.mu.m) is a surface roughness of a surface of the filter. Preferably, the porous ceramic filter has a thermal expansion coefficient of less than 0.5.times.10.sup.-6 /.degree.C. within a temperature range of 40.degree..about.800.degree. C. in a direction parallel to a flow passage of the filter. The porous ceramic filter according to the invention is preferably used for eliminating soots in an exhaust gas from a diesel engine, and has a long operating time and requires less frequent filter regenerations.

REFERENCES:
patent: 4464185 (1984-08-01), Tomita et al.
patent: 4869944 (1989-09-01), Harada et al.
patent: 4912076 (1990-03-01), Mizrah et al.
patent: 4946487 (1990-08-01), Butkus
patent: 5069697 (1991-12-01), Hamaguchi et al.

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