What is the composition of car urea? Is car urea poisonous?

becauseOur domestic vehicles are basically gasoline vehicles, while diesel vehicles are mostly large trucks or trucks.So most people may not know about diesel cars, let alone car urea. So, why add urea for diesel vehicles? What exactly is urea for vehicles? Is it poisonous?

What is the composition of urea for vehicles? Is it poisonous?

Urea for vehicles is composed of 32.5% high-purity urea and 67.5% deionized water.

Under normal circumstances, car urea is harmless to the human body (after contacting the skin, it only needs to be washed with a lot of soapy water or clean water, but remember not to enter the eyes or swallow), but if the car urea is in high temperature conditions May liberate ammonia gas (NH₃).andNH₃It will have a corrosive and irritating effect on the human skin tissue that it comes into contact with. If you are exposed to ammonia for a long time, you may experience skin pigmentation or skin ulcers. (Once this happens, you should seek medical attention immediately, so as not to cause more serious consequences)

Why add urea to diesel vehicles?

The main purpose of adding urea to diesel vehicles is to reduce nitrogen oxides (NOx) in exhaust gas from diesel engines.

Vehicle urea is evenly injected into the exhaust of the vehicle through the selective exhaust catalytic reduction system (SCR) of diesel vehicles. At high temperatures, vehicle urea rapidly decomposes ammonia (NH₃), and at the same time, it undergoes a catalytic reduction reaction with NOx. Finally, a harmless N is generated₂And H₂O is discharged.