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Re: (Shomegrown)

Diesel Exhaust Fluid (DEF)
Q & A
SCR: The Leading Technology to Meet 2010 Emission Regulations
Q. What is Selective Catalytic Reduction (SCR)?
A. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a
catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions. SCR is
the leading technology being used to meet 2010 emission regulations.
Q. How does an SCR system work?
A. The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen
emitted from engines) that are harmful to our health and the environment. SCR is the
aftertreatment technology that treats exhaust gas downstream of the engine. Small
quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a
catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide.
The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst,
converts the NOx to harmless nitrogen (N2) and water (H2O).
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