Selective Catalytic Reduction (SCR)

The primary function of the SCR catalyst in a Diesel ATS is to convert harmful nitrogen oxides (NO_x = NO + NO₂) in the exhaust gas to nitrogen and water. The SCR reaction takes place at the catalyst surface in the presence of NH₃ which is generated from AdBlue^®/DEF (solution of 30% of Urea in water) upfront the SCR catalyst.

Dinex has a variety of SCR catalyst technologies that can be selected based on specific application conditions and ATS temperature levels. Typically, titanium-vanadium based technologies are suitable for applications, where the exhaust gas temperature is not exceeding 550°C level. The Cu-SCR technology is designed for high DeNOx functionality at low temperatures and the Fe-SCR technology is suitable for conditions where the exhaust temperatures exceed 600°C.

Advanced emissions regulations like EuroVI / EPA10 / China N6 / Bharat S6 need more than 95% NO_x conversion levels and the Dinex Cu-SCR technology achieves conversion levels well above this limit.

This SCR technology is typically characterized by high NOx conversion activity in a wide temperature window with very low NH₃ oxidation at high temperatures which ensures optimal AdBlue^®/DEF utilization.