It is usually used in diesel engines. It is a liquid used in SCR technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. Its components are 32.5% high purity urea and 67.5% deionized water. The purpose is to reduce the nitrogen oxide pollutants emitted by diesel engines, so it is commonly known as Euro IV standard in China.
Extended data:
Urea solution is a colorless and transparent clear liquid with a concentration of 365,438+0.8%-33.2%. It is called vehicle urea solution or "vehicle denitrification agent" to reduce nitrogen oxides.
At present, the vehicle urea solution is generally composed of 32.5% high-purity urea and 67.5% deionized water. Deionized water needs to be filtered and purified dozens of times on the basis of ordinary tap water to ensure the purity is qualified. The concentration of urea directly affects the reduction rate of nitrogen oxides and the crystallizing point of urea solution.
References:
Function of automobile urea-Xinhuanet