What is the purpose of automotive urea?
1 Answers
Automotive urea serves the function of treating exhaust gases to reduce pollutants in the emissions. It is a liquid used in SCR (Selective Catalytic Reduction) technology to decrease nitrogen oxide pollution in diesel vehicle exhaust. Its composition consists of 32.5% high-purity urea and 67.5% deionized water. The operation process of the SCR system is as follows: when nitrogen oxides are detected in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid (DEF). The DEF and nitrogen oxides undergo a redox reaction in the SCR catalytic converter, producing harmless nitrogen gas and water vapor that are then emitted.