What is Automotive Urea?

[LaAlina]

Automotive urea is a colorless, transparent liquid stored in the urea tank. When sensors detect nitrogen oxides in the exhaust pipe, it automatically sprays atomized automotive urea, which mixes with the nitrogen oxides and undergoes a redox reaction in the SCR catalytic reaction tank, ultimately producing non-polluting nitrogen and water that are expelled. Automotive urea is an essential additive for the SCR (Selective Catalytic Reduction) solution. The SCR system includes a urea tank (containing diesel exhaust fluid) and an SCR catalytic reaction tank. The primary harmful substances in diesel vehicle exhaust are nitrogen oxides and particulate matter. While particulate emissions can be reduced through technical means within the engine, nitrogen oxides remain the main component of the exhaust. By injecting urea into the exhaust after-treatment device, the urea decomposes into ammonia at high temperatures. Under the action of a catalyst, the ammonia reacts with nitrogen oxides to produce harmless nitrogen and water. This device is called the SCR after-treatment system.