What is the function of engine urea?

[VanBarrett]

Automotive urea is used to convert nitrogen oxides in vehicle exhaust into harmless nitrogen and water, enabling the vehicle to meet the national emission standards. Vehicle urea is a colorless and transparent liquid with a concentration between 31.8% and 33.2%, primarily composed of 32.5% high-purity urea and 67.5% deionized water. Urea, in conjunction with the SCR system, filters and removes NOx, the main emission pollutant from diesel engines, as well as particulate matter. Urea is added specifically for diesel-engine vehicles because diesel engines emit harmful nitrogen oxide gases, which cause environmental pollution. Long-term inhalation of these gases can severely harm human health. To mitigate this hazard, diesel-engine vehicles require urea. Urea has a catalytic function; when it encounters nitrogen oxides, it triggers a chemical reaction, converting them into nitrogen and water, which are then expelled. Effects of not using urea in vehicles: Exceeding emission limits, causing environmental pollution; chemical substances in the vehicle system may oxidize, leading to clogging of the urea nozzle and rendering the entire system inoperable; reduction in vehicle power.