CATALYST FOR PURIFICATION OF EXHAUST GAS AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To efficiently reduce and purify NOx in an exhaust gas from a diesel engine. SOLUTION: A catalytic component 3 comprising an active metal such as Pt supported on a zeolite by an ion exchange method, and a mesopore silicate 2 having pores of almost uniform size are mixed, or laminated in such a manner that the component 3 is in the upper part and the silicate 2 is in the lower part to prepare a catalyst. A catalytic component comprising an active metal such as Pt deposited on a zeolite by other methods except for the ion exchange method can be used together. Ce can be deposited on the mesopore silicate 2.