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How Does AdBlue® Diesel Exhaust Fluid Work in SCR System

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How Does AdBlue® Diesel Exhaust Fluid Work in SCR System

2019-04-10

AdBlue® Diesel Exhaust Fluid is injected into the exhaust stream, where it's water evaporates. The separation of Urea and Water due to heat, is called thermolysis. The chemical reaction is:


(NH2)2CO + Heat → NH3 + HNCO



NH3 is Ammonia and the substance that reacts in the SCR system but not Urea. HNCO is called isocyanic acid and cannot be used in this form in the SCR system.


Isocyanic acid is converted further with the help of the water that got evaporated from before. The process is called Hydrolysis:


HNCO + H2O  → NH3 + CO2



As you can see there is more Ammonia created for use, the process releases some CO2. By using Ammonia, the SCR system can target and reduce NOx.

 
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