New cordierite diesel particulate filter material for the diesel particulate-NO{sub}x reduction system

摘要

The regulation of emissions discharged from diesel engines has become stricter worldwide. The regulatory values allowed for particulate matter (PM) as well as NO{sub}x will be lowered, especially in the Europe Euro 5, the U.S. EP 07, and the new Japanese long-term regulations. Since there is a tradeoff between the PM and NO{sub}x that are discharged from diesel engines, new emission reduction measures will be needed in order to greatly reduce both at the same time. By coating DPFs (Diesel Particulate Filters), which have been studied before, with NO{sub}x storage reduction catalysts, it has been found that simultaneous reduction of PM and NO{sub}x is possible, and so research was carried out in order to optimize a DPF for this type of system use. The DPF developed was used in the European DPNR (Diesel Particulate-NO{sub}x Reduction System) subject vehicles by Toyota Motor Corporation, and actual trial runs in Europe were performed. Deterioration of the DPF was investigated in designated corrected vehicles, and it was confirmed that no problems had occurred.