Catalyst (SCR)+ Filter (DPF)
Selective Catalytic Reduction (SCR) + Diesel Particulate Filter (DPF)
Selective Catalytic Reduction of NOx (SCR deNOx) is a technology applied on diesel engines to reduce the NOx emissions, by injecting a urea-water solution (AdBlue) into the exhaust gas upstream of the SCR catalyst, generating ammonia (NH3). This is absorbed onto the catalyst, converting NOx in diatomic nitrogen (N2) and water (H2O).
A Diesel Particulate Filter reduces the particulate matter emissions from the engine exhaust gases. The most efficient DPF is the wall flow DPF, commonly made from ceramic materials with a honeycomb structure with alternate channels plugged at opposite ends.