Information on AdBlue™
™ is a registered trademark of the Verband der Automobilindustrie e.V. (VDA). (www.vda.de) for AUS32 (Aqueous Urea Solution 32%), it is also often referred to as Automotive Urea Solution.
AdBlue is a solution consisting of high purity urea (typically crystalline) dissolved and suspended within de-ionised water. The ratio of the mix is approximately 32.5% urea and 67.5% de-ionised water.
AUS32 (AdBlue™) is used by modern diesel engines which are equipped with an SCR, AdBlue never comes into contact with the fuel, it is a common misconception that it is an additive. AdBlue is carried onboard the vehicle in a separate vessel to the. It is injected into the exhaust gases as a post combustion process through an SCR where it breaks harmful NOx (Nitrous Oxide) emissions down into mostly Nitrogen and Oxygen. The chemical reaction can be seen below.
The use of AdBlue benefits everyone: it helps the environment by reducing the number of harmful emissions created by diesel engines and it helps fleet operators and drivers reduce fuel costs. It is likely that further savings will be made in the future as governments are anticipated to introduce new carbon taxes and penalties for individuals who do not take necessary action to reduce damage impacted on the environment.
Requirements for reduction in NOx emissions by diesel engines is influenced by Euro 4 and Euro 5 legislation. Initial targets for emission reduction are Public Transport and the Commercial Sector (HGV’s). Forthcoming legislation will influence smaller vehicles with diesel engines including LGV’s, Taxi’s and eventually privately owned cars in the public sector.
Typically an SCR onboard a HGV or coach will use AUS32 in a constant 1:20 ratio against diesel fuel (approximately 5%). This however is reduced in smaller vehicles, for example the new Mercedes S class adopts a variable injector which controls the ratio of AdBlue into the SCR providing an even more economical solution to NOx reduction.
SCR systems are sensitive to potential chemical impurities in the urea solution. In order to ensure that the SCR system continues to work effectively, care must be taken to ensure the purity of the catalyst and the reducing agent. Even small amounts of contaminant can severely impact the performance of the SCR system. Manufacturing quality control for AUS32 solutions are governed by DIN70070. A new ISO standard (ISO22241) is currently under preparation to ensure the correct selection of handling equipment.
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AdBlue™ is a trademark of the Verband der Automobilindustrie e.V. (VDA). www.vda.de