Why Do Vehicles Need to Use Urea?

[VanRyder]

Vehicles need to use urea to reduce harmful nitrogen oxides in the exhaust into nitrogen and water. Here is some information about why vehicles use urea: 1. Reason Analysis: The exhaust directly emitted by the engine can no longer meet regulatory requirements, leading to the development of exhaust aftertreatment devices. The main harmful substances in diesel vehicle exhaust are nitrogen oxides and particulate matter, which can be reduced inside the engine through technical means. 2. Principle: The exhaust primarily contains nitrogen oxides. Urea is injected into the exhaust aftertreatment device, where it 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 (Selective Catalytic Reduction) aftertreatment system.