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Abstract

A nitrogen oxide removing catalyst has a porous material having fine holes with controlled diameters and a catalyst having an active ingredient supported in the fine holes are used. In one instance, the diameter of the plurality of fine holes is within a range of 8-9 Å. The fine hole diameter is preferably from 8-9 Å when the diameter is measured in a gas adsorption method in which fine holes with diameters of 3.4-14 Å can be measured. The fine hole diameter is also preferably from 8-9 Å when the fine hole diameter is calculated from a crystal structure. In another instance, the porous material is mesoporous silica. The primary particle diameter of the mesoporous silica is preferably within a range of 150-300 nm. The nitrogen oxide removing catalyst having superior durability and a method of removing nitrogen oxides are also provided.

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First Claim