Why use Adblue and not use 100% Urea?

  • Thread starter James125
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  • #1
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Main Question or Discussion Point

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?

Thanks
 

Answers and Replies

  • #2
2,017
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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.
 
  • #3
19
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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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