HONEYCOMB STRUCTURE

摘要

A honeycomb structure (100) includes a center part (6) which has a cylindrical honeycomb structure part (4) withaporous partition wall (1) and an outer circumferential wall (3) defining a plurality of cells (2), and which has a pair of electrodes (21) disposed on the side surface (5) of the honeycomb structure part (4). The honeycomb structure also includes an outer circumferential part (36) disposed around the center part (6). The electric resistivity of the honeycomb structure part (4) is 1-200 ©cm. Eachelectrode in the electrode pair (21) is formed in a band shape that extends in the direction that the cells (2) extend. In a cross section that is perpendicular to the direction in which the cells (2) extend, one electrode (21) is located opposite the other electrode (21) over the center of the honeycomb structure part (4). The outer circumferential part (36) has a porous partition wall (31) and an outer circumferential wall (33) that define a plurality of cells (32). The volumetric heat capacity of the outer circumferential part (36) is smaller than the volumetric heat capacity of the center part (6). Provided is a honeycomb structure, which is a catalyst carrier and functions as a heater when voltage is applied. The honeycomb structure also has an excellent thermal shock resistance.