Selective Catalyst Reduction (G2269013): Overview

The Selective Catalyst Reduction (SCR) system is a solution for the exhaust gas aftertreatment used to reduce the Nitrogen Oxide (NOx) within the exhaust gas.

For this purpose a specified amount of Diesel Exhaust Fluid (DEF) is injected into the exhaust system downstream of the Diesel Particulate Filter (DPF). The injected DEF into the exhaust system is converted to ammonia (NH3) and carbon dioxide (CO2). The resulting ammonia (NH3) is used within a special catalyst in the exhaust stream. The resulting reaction converts the unwanted NOx into harmless nitrogen (N2) and water (H2O) vapor.