What is the purpose of adding urea to large vehicles?

[DelEmmanuel]

Diesel engines add urea to catalyze the nitrogen oxides emitted by the diesel engine. During operation, diesel engines emit nitrogen oxides, which are harmful to the atmosphere and human health. When urea encounters these nitrogen oxides, a chemical reaction occurs, converting them into nitrogen and water, both of which are harmless. Below are relevant details: 1. Urea is essential: With the improvement of national emission standards, vehicle urea has become a necessary consumable, much like engine oil and lubricants. 2. Urea standards: In China, qualified urea solutions typically consist of 32.5% ultra-pure urea and pure water. The urea solution reacts with nitrogen oxides (NOX) through a reduction process, producing nitrogen, oxygen, and water, thereby reducing nitrogen oxide emissions. This method is applicable to every SCR system in diesel engines meeting Euro IV and Euro V emission standards. 3. Hazards of inferior urea: The power and fuel consumption of diesel vehicles can be affected by urea. If a diesel vehicle lacks exhaust treatment equipment or uses inferior products, it may cause the engine to automatically reduce speed and negatively impact the catalyst in the SCR catalytic reaction tank.