​DPF Diesel Particulate Filter for Diesel Vehicles Cordierite/SiC Substrate Euro 5/6

DPF (Diesel Particulate Filter)

Since about 2005, particulate filters have been generally used with modern diesel engines to remove diesel particulate mass emissions (PM) while significantly reducing the emitted particulate number (PN).

The most effective type is the so called wall-flow filter. Particulate matter is removed from the exhaust by physical filtration using a honeycomb structure similar to an emissions catalyst substrate but with the channels blocked at alternate ends. The exhaust gas is thus forced to flow through the walls between the channels and the particulate matter is deposited as a soot cake on the walls. Such filters are made of ceramic honeycomb materials (cordierite, silicon carbide or aluminium titanate).
 

Diesel particulate filters (DPF) are devices that physically capture diesel particulate matter (PM) to prevent their release into the atmosphere. Diesel particulate filter materials have been developed that show impressive filtration efficiencies, over 90%, as well as good mechanical and thermal durability. Diesel particulate filters have become the most effective technology for the control of diesel particulate emissions - including particle mass and numbers - with high efficiencies.

To meet China Stage VI / Euro 6 and above emission regulations, WFEC has developed the catalysts and coating process technology for DPFs. The catalyst coated in the pores of the filter wall can improve passive regeneration to extend regeneration intervals and cut the fuel cost, as well as the reduction of HC and CO. The CDPFs with lower back pressure and better catalytic activity can be applied to various diesel vehicles.