Patent ID: 7879429
Filing Date: 2011-02-01
Classification: B01J,C04B,F01N,Y02T,Y10T

Abstract:
1. A honeycomb structure having a plurality of honeycomb units united through a seal material layer, the honeycomb units each having a plurality of through holes arranged side by side in a longitudinal direction and separated from each other by wall surfaces of a wall between the through holes, all of the through holes being open on an end face of the honeycomb unit, wherein: the honeycomb units comprise at least: ceramic particles, and at least one of inorganic fibers and whiskers in order to increase a specific surface area of the wall between the through holes; at least one of the honeycomb units has a cross section perpendicular to a longitudinal direction thereof, the cross section having an area greater than or equal to about 5 cm a ratio of a total cross sectional area of all the honeycomb units, perpendicular to the longitudinal direction thereof, to an area of a cross section of the honeycomb structure, perpendicular to a longitudinal direction thereof, is greater than or equal to about 85%; the ceramic particles comprise at least one selected from the group consisting of alumina, silica, zirconia, titania, ceria, mullite, and zeolite; the honeycomb units are formed by firing a material including the ceramic particles and the at least one of the inorganic fibers and the whiskers at about 600° C. to about 1200° C.; and for each of the honeycomb units, a ratio of a thermal conductivity of the honeycomb unit to a thermal conductivity of the seal material layer falls within a range of about 0.2 to about 5.