The SCR Process
SCR (Selective Catalytic Reduction) which indicates that only NOx and no other oxidised species is chemically reduced to elemental nitrogen and water on a purpose-built catalyst. Most European heavy-duty vehicles manufacturers have opted to use this technology to help them meet the emission legislation. The main components of the SCR system are the SCR catalyst, the injection unit, the tank and the dosing control unit.

The NOx molecules in the exhaust are converted to harmless nitrogen and water.