selective catalytic reduction

Selective Catalytic Reduction (SCR) is a process used to reduce harmful nitrogen oxide (NOx) emissions from vehicles and industrial sources. It involves injecting a urea-based additive, called diesel exhaust fluid (DEF), into the exhaust gases. The mixture then passes through a catalyst, where chemical reactions convert NOx into harmless nitrogen and water vapor. This method effectively decreases air pollution, helping meet environmental regulations while allowing engines to operate efficiently. In summary, SCR uses chemicals and catalysts to clean up emissions before they are released into the atmosphere.