Abstract: A honeycomb structure includes: a honeycomb structure portion 1 made of ceramics, the honeycomb structure portion 1 including an outer peripheral wall 10, a partition wall 11defining a plurality of cells 11a, and a plurality of slits 12 cut inwardly in a radial direction from the outer peripheral wall 10; a pair of electrode layers 2 being provided on an outer surface of the outer peripheral wall 10 so as to face each other across a central axis CA of the honeycomb structure portion 1; and reinforcing layers 3 provided on the outer surface of the outer peripheral wall 10 so as to be located between the pair of electrode layers 2 in a circumferential direction 1C of the honeycomb structure portion 1, the reinforcing layers 3 being electrically separated from the pair of electrode layers 2 by the slits 12.

Abstract: A catalyst device includes a central axis and a catalyst support. The catalyst support includes a slit that is arranged to be orthogonal to the central axis. The slit is arranged to be symmetrical with respect to an arbitrary plane that includes the central axis.

Abstract: A honeycomb structure includes: a honeycomb structure portion which includes an outer peripheral wall, and partition walls disposed inside the outer peripheral wall and partitioning a plurality of cells forming flow paths from one end surface to the other end surface; and a pair of electrode layers provided on an outer surface of the outer peripheral wall so as to extend in a strip shape along a direction in which the cells extend and sandwich a central axis of the honeycomb structure portion; wherein a porosity PW of the partition walls is 30% to 55%, and a ratio of the porosity PW of the partition walls to a porosity PO of the outer peripheral wall (PW/PO) satisfies 1<PW/PO?1.8.

Abstract: A honeycomb structure 20 according to the present invention includes: a ceramic honeycomb structure portion 10 including: an outer peripheral wall 12; a partition wall 13, the partition wall 13 defining a plurality of cells 16; and a pair of electrode layers 14a, 14b each arranged so as to extend in a form of a band on an outer surface of the outer peripheral wall 12, across a central axis of the honeycomb structure portion 10, wherein the honeycomb structure portion 10 is provided in an end portion region(s) extending in a direction from the one end face and/or the other end face to a center in a flow path length direction of the honeycomb structure portion 10, and the honeycomb structure portion 10 comprises at least one low porosity portion 4 having a lower porosity than an average porosity of the whole honeycomb structure portion 10.

Abstract: A catalyst device includes a central axis and a catalyst support. The catalyst support includes a slit that is arranged to be orthogonal to the central axis. The slit is arranged to be symmetrical with respect to an arbitrary plane that includes the central axis.