Patent ID: 8685331

Claim:
A honeycomb structural body comprising: at least one honeycomb unit including a Î² type zeolite, a phosphate group zeolite, and an inorganic binder and having a plurality of through holes divided by partition walls and arranged in a longitudinal direction of the honeycomb unit; wherein the Î² type zeolite includes secondary particles having an average particle diameter of approximately 0.5 Î¼m or more and approximately 5 Î¼m or less, wherein the phosphate group zeolite includes primary particles having an average particle diameter of approximately 0.5 Î¼m or more and approximately 5 Î¼m or less, wherein a ratio of a mass of the phosphate group zeolite with respect to a total mass of the Î² type zeolite and the phosphate group zeolite is approximately 5% or more and approximately 35% or less.