Selective catalytic reduction - SCR

Which method of exhaust control is the most effective for commercial vehicles depends decisively upon the nature of the exhaust gases. The particulate filter is an outstanding solution for vehicle engines that emit particulates predominantly.

Eberspächer has developed a quite special system for engines with low particulate emission and high nitrogen oxide emission: selective catalytic reduction - SCR

Simple but effective

The SCR technology makes use of a simple chemical reaction: Urea is injected - precisely metered - into the exhaust gases of the engine. This creates ammonia which reacts with the nitrogen oxides in a downstream catalytic converter. The result is that the nitrogen oxides are converted into harmless nitrogen and water vapour. To increase the conversion rates even more at low temperatures, an oxygen catalytic converter can be inserted additionally upstream of the SCR catalytic converter.

This system reduces the nitrogen oxide emissions by more than 90%, so that the Euro 5 standard can be fulfilled without difficulty.

Vehicles with SCR technology require an extra tank for the urea.

The colourless reduction fluid that is non-toxic and neutral in odour is available at numerous petrol stations under the name of "AdBlue".