Dinex - Selective Catalytic Reduction (SCR)
The primary function of SCR catalyst in a diesel ATS is to convert harmful nitrogen oxides (NOx = NO + NO2) in the exhaust gas to nitrogen and water. The SCR reaction takes place on the catalyst, in the presence of NH3 generated from AdBlue (Urea and water solution) upfront the SCR catalyst. Advanced emissions regulations like EU VI /EPA/China N6/Bharat 6 need above 95% NOx conversion levels and all Dinex SCR technologies achieve conversion levels well above this limit.
Dinex has a wide variety of SCR catalyst technologies which can be selected based on actual applications and ATS temperature levels. Typically, titanium-vanadium based technologies are suitable for applications, where the exhaust gas temperature is not exceeding 550 deg C level. Cu-Zeolite and Fe-Zeolite technologies are suitable for conditions where the exhaust temperatures exceed well above 600 deg C.
The most widely used SCR technology in advanced regulations like EU VI is Cu-Zeolite based. The Dinex technology is typically characterised by high NOx conversion activity in wide temperature window, low NO2 formation and very low NH3 oxidation even at high T (Optimal Urea utilization).