Technical Paper
Suitable Stainless Steel Selection for Exhaust Line Containing a Selective Catalytic Reduction (SCR) System
2011-04-12
2011-01-1323
Due to the evolution of emission control standards, new pollution control systems will be necessarily used for off-road vehicles and trucks exhaust systems and in the near future for passenger cars. Indeed, the will to reduce NOx emission through Euro 5 (2009) and then to Euro 6 (2014) and American EPA Tier 4 (2008-2015) imposes the implementation of a new after-treatment system within the exhaust line. One of the most promising technologies takes advantage of the reduction feature of ammonia (NH₃) on NOx. This system called Selective Catalytic Reduction (SCR) couldn't be developed by storing directly ammonia as a reduction agent on the vehicle due to its high toxicity and flammability. It is why urea is used as an ammonia generator through thermolysis reaction.
