| 摘要 |
A honeycomb structure includes at least one honeycomb unit having a longitudinal direction and including zeolite, an inorganic binder, and walls. The zeolite includes a first zeolite ion-exchanged with at least one of Cu, Mn, Ag, and V and a second zeolite ion-exchanged with at least one of Fe, Ti, and Co. Each wall has first and second surfaces which extend along the longitudinal direction and define a thickness of each wall. A ratio of the first zeolite by weight to a total weight of the first and second zeolites at a center of the thickness of each wall is larger than the ratio of the first zeolite at the first or second surface. A ratio of the second zeolite by weight to the total weight at the first or second surface is larger than the ratio of the second zeolite at the center of the thickness of each wall.
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