6-4 SPECIAL INSTRUCTIONS FOR -SCR- EXHAUST SYSTEMS E UROCARGO Euro 4/5 The nitrogen oxide catalytic reduction principle. AdBlue 6.2 The nitrogen oxide catalytic reduction principle. AdBlue The additive is sent from a dedicated reservoir by means of supply module (1) to dosing module (3), which injects AdBlue into the exhaust pipe. The mixture thus obtained is then fed to the SCR catalyzer that transforms the NOx into nitrogen and water. Post-treatment is based on a simple principle: the chemical reaction of ammonia NH 3 with nitrogen oxides NO and NO 2 produces two harmless substances: water vapour H 2 O and nitrogen N 2 . The whole system is managed by an electronic control unit.
Figure 6.2 114734 1. Pumping module - 2. Catalyzer - 3. Dosing module - 4. AdBlue reservoir The nitrogen oxide catalytic reduction principle. AdBlue Base - January 2008 Print 603.93.431