NOx reduction and N2O emissions in a diesel engine exhaust using Fe-zeolite and vanadium based SCR catalysts

摘要

Among various approaches used to comply with strict diesel engine exhaust regulations, there is increasing interest in urea based selective catalytic reduction (SCR) as a NOx reduction technology, due to its high reduction and excellent fuel efficiencies. NOx reduction by SCR catalysts is affected by variations in the NO2/NOx ratio, caused by oxidation catalysts such as the diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) installed in diesel engines. Recently, it has been reported that the greenhouse gas (GHG) variant N2O, which is a by-product of the NOx conversion process in the after-treatment system, will be subject to regulation.