Patent ID: 8357333

Claim:
A honeycomb structural body comprising: a honeycomb unit having a plurality of through holes defined by cell walls and arranged in a longitudinal direction of the honeycomb unit, the honeycomb unit comprising: an inorganic binder; a first zeolite comprising: at least one of a β type zeolite and a ZSM-5 type zeolite; and primary particles having an average particle diameter of approximately 0.01 μm or more and approximately 0.1 μm or less; and a second zeolite comprising: a phosphate group zeolite; and primary particles having an average particle diameter of approximately 0.5 μm or more and approximately 5 μm or less, a ratio between a mass of the first zeolite and a total mass of the first and second zeolites being approximately 0.1 or more and approximately 0.5 or less.