| abstract |
A honeycomb structure includes a honeycomb unit having plural cells extending from one end face to the other end face of the honeycomb unit in a longitudinal direction separated by a cell wall. The honeycomb unit has an opening ratio of 57% or more and includes 61 to 70 mass% of zeolite, 15 to 25 mass% of an inorganic fiber, and 10 to 20 mass% of alumina other than alumina in the zeolite and the inorganic fiber. The aperture ratio (%) is a y value in a formula (1) or less when a content x (mass%) of the zeolite in the honeycomb unit is less than 66 mass%. y = 0.55 x + 30 n The opening ratio (%) is a y value in a formula (2) or less when the content x (mass%) of the zeolite in the honeycomb unit is 66 mass% or more. y = - 0.25 x + 82.8 |