What is the purpose of adding urea solution to large vehicles?

[LaAlan]

Converts nitrogen oxides into nitrogen and water for emission. Below are relevant explanations: 1. Reason for adding urea solution: Diesel engines emit harmful nitrogen oxide gases during operation, which are hazardous to both the atmosphere and human health. Prolonged exposure to such gases can lead to respiratory diseases. To mitigate these hazards, urea is utilized, involving a catalytic reaction where urea reacts with nitrogen oxides emitted by diesel engines. This chemical reaction transforms nitrogen oxides into nitrogen and water, both harmless to the atmosphere and humans. 2. Function: The urea solution undergoes a reduction reaction with NOX, producing nitrogen, oxygen, and water, thereby reducing nitrogen oxide emissions.