HONEYCOMB CATALYST FOR EXHAUST GAS PURIFICATION

摘要

PROBLEM TO BE SOLVED: To provide a novel honeycomb catalyst which is capable of efficiently performing the purification treatment of NOxfrom a diesel exhaust.

SOLUTION: The honeycomb catalyst for exhaust gas purification is obtained by forming a filmy mesoporous material such as mesoporous silica of which the specific surface area is 100-1,400 m2/g and the pore diameter is 1-20 nm and the thickness is 10 nm-10 μm at the inner wall of the gas channel of a monolithic molding and supporting a catalyst containing platinum thereto. The catalyst (honeycomb catalyst) is able to efficiently perform the purification treatment of 80% or more of NOxat 160-300°C in lean burn atmosphere (normally 5% or more of oxygen concentration atmosphere) where the purification treatment is conventionally difficult to perform.

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