Diesel engine exhaust emission control system

摘要

A diesel engine exhaust emission control system includes, in an exhaust pipe 3 of a diesel engine 2, a first cleaner 4 and a second cleaner 5 installed sequentially from the diesel engine 2 side. The first cleaner 4 includes Pt particles having an average particle size d1 of≤10 nm, CeO2, and a zeolite. The second cleaner 5 includes Pt particles having an average particle size d2 of≥15 nm, and a zeolite. Thus, it is possible to sufficiently clean up NOx throughout the entire exhaust gas temperature region.