Porous honeycomb structure

Details Porous honeycomb structure Porous honeycomb structure

2007-10-30

2007-10-30

Lawrence, Frank M. (Department: 1724)

Gas separation

Specific media material

Ceramic or sintered

C428S116000

Reexamination Certificate

active

10505436

ABSTRACT:
A porous honeycomb structure includes: a plurality of partition walls containing cordierite as a main component and constituted of a porous ceramic having a porosity of 55 to 75% and an average pore diameter of 15 to 35 μm, wherein the partition walls have a pore distribution represented by the following condition formula (1):in-line-formulae description="In-line Formulae" end="lead"?Lr>0.3×P/100+0.91,  (1)in-line-formulae description="In-line Formulae" end="tail"?“in the above condition formula (1), Lr means an average developed length ratio, and P means a porosity obtained from a total pore volume measured by a mercury press-in type porosimeter, assuming that a true specific gravity of cordierite is 2.52 g/cc.”The porous honeycomb structure is capable of effectively achieving raising of a trapping efficiency of soot or the like, lowering of a pressure loss, improving a purifying performance by effective use of a catalyst, and lengthening a trapping time, and is additionally capable of improving a dissolved loss limit at the time of filter regeneration, and an isostatic strength.

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