Emission Control Systems

SCR (Selective Catalytic Reduction)

• S elective C atalytic R eduction(SCR) injects a liquid-reductant agent by means of a reducing agent injector, through a special catalyst into the exhaust stream of a diesel engine. • The reductant source is usually automotive-grade urea.

• Chemical reaction that converts NOx into nitrogen, water and tiny amounts of CO2

• It may be installed upstream or downstream of the particulate filter.