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Why use Adblue and not use 100% Urea?

  1. Sep 13, 2013 #1
    Hello all

    I am puzzled as to why SCR uses Adblue solution which is only 33% Urea. Why not use 100% Urea minimise fill ups and weight?

  2. jcsd
  3. Sep 13, 2013 #2
    Becuase it's ammonia that is needed, not urea. You don't have enough water floating round to react in time. So you are injecting both reactants.
  4. Sep 13, 2013 #3
    Stupid question really Urea is a solid. It's solubility in water is 107.9 g/100 ml @ 20 °C. Presumably 33% at -10C or something.
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