Analysis of Sophisticated DPNR Catalyst

-Focused on PM Particle Number Emissions-

Abstract

The original DPNR catalyst has been developed to decrease both PM and NOx emissions on the diesel engine. It will be necessary to focus on PM particle number emissions in the future though the development for the decrease of exhaust weight has been considered before now. In this study, the relation between the pore structure of DPNR catalyst and the PM particle trapping was clarified by evaluating the cordierite DPF of average pore size 20 μm or more. Furthermore, the optimal pore structure to trap the PM particle highly effective was discussed.