Selective Catalytic Reduction (SCR)

Selective Catalytic Reduction (SCR) involves the chemical reaction of the nitrogen oxides (NOx) contained within exhaust gas with a separately added reagent (commonly ammonia or urea) that will remove the oxygen atoms from the nitrogen oxide molecules, leaving the nitrogen as N2.

The reagent reacts “selectively” with the NOx instead of being oxidized. SCR systems are typically used to control NOx on gas turbines and large boilers (industrial, municipal solid waste and public utility). More recently, SCR system have started to be used on diesel engines associated with trucks, locomotives and marine vessels.

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