AdBlue® is a registered trademark and is licensed by the VDA and nowadays few Italian companies are authorized to produce it: Azotal s.p.a. it’s one of these. The AdBlue® is used to reduce the emissions of nitrogen oxides produced by vehicles equipped with diesel engines and emitted in the exhaust gases. AdBlue® by Azotal is a very pure and stable solution, composed of 32.5% urea and water.
This is not a toxic or even dangerous or inflammable solution. The AdBlue® to be such must naturally be certified and must contain a specific concentration of technical urea and must comply with the qualitative parameters that regulate the contents of metals, calcium, biuret and other substances that could cause damage to the catalysts if present in the liquid.
The market of AdBlue® in Italy and in the world is undergoing strong growth and development: if previously it was only vehicles, heavy vehicles and earthmoving machinery EURO 4 and EURO 5, to use the synthesis solution of water and urea, with the arrival of the strict EURO 6 regulations, the need arose to install technologies compatible with AdBlue® also on private vehicles for transporting people.
Preserved in a special tank, the AdBlue is made up of 67.5% water and 32.5% urea. Reacting with the exhaust gases at elevated temperatures, the urea turns into ammonia (NH3). This allows to start a process of selective catalytic reduction (SCR). In this reaction, ammonia and NOX react to form water and nitrogen (N2).