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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
SCR is the. haust 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).