| 摘要 |
PROBLEM TO BE SOLVED: To improve particulate cleaning efficiency in a catalyst for purifying exhaust gas of a diesel engine. SOLUTION: In a diesel engine exhaust gas cleaning catalyst comprising a carrier base, a coating layer and a catalyst component 6 for cleaning particles borne on the coating layer, a matrix constituent of the coating layer constitutes primary particles 4 and an aggregate of the primary particles constitutes a secondary particle 5 and the catalyst component is dispersed not only among the secondary particles of the matrix material of the coating layer but also among the primary particles. In this case, the secondary particles are provided with such diameters as to form clearances in the range of 0.01-0.5 μm between the secondary particles. |
