Patent ID: 7811650

Claim:
A honeycomb structure inside which a fluid can flow, said honeycomb structure comprising: porous honeycomb units that 1) have multiple through-holes, and 2) include at least an inorganic material of a first form comprising ceramic particles and an inorganic material of a second form comprising inorganic fibers included in a body of and existing on outer longitudinally extending surfaces of the porous honeycomb units; at least one of the porous honeycomb units having, perpendicular to the through-holes, a cross-sectional area of about 5 to about 50 cm 2 ; and sealing material layers jointing two or more of the porous honeycomb units to each other along the outer longitudinally extending surfaces of the porous honeycomb units where the through-holes are not open, wherein a specific surface area for the porous honeycomb units is in a range from 25,000 m 2 /L to 42,000 m 2 /L.