Patent ID: 8609031

Claim:
A honeycomb structure comprising: at least one honeycomb unit comprising: zeolite; an inorganic binder; and cell walls extending from a first end face to a second end face to define cells along a longitudinal direction of the at least one honeycomb unit, each of the cell walls including a center part in the longitudinal direction and a first end part adjacent to the first end face, the first end part having a thickness larger than a thickness of the center part, and/or the first end part having a porosity smaller than a porosity of the center part, wherein the first end part includes an end part covering material that covers the first end face of the cell walls and extends from the first end face along the longitudinal direction of the at least one honeycomb unit, wherein the end part covering material has a non-uniform thickness, wherein the end part covering material comprises at least zeolite and alumina or at least zeolite and zirconia, and wherein the zeolite included in the end part covering material is obtained through an ion exchange with at least one of Fe, Cu, Ni, Co, Zn, Mn, Ti, Ag and V.