Why use Adblue and not use 100% Urea?

  • Thread starter Thread starter James125
  • Start date Start date
Click For Summary
SUMMARY

The discussion clarifies that Adblue, a solution containing 33% Urea, is utilized in Selective Catalytic Reduction (SCR) systems because ammonia is the required reactant for effective operation. Using 100% Urea is impractical due to its solid state and limited solubility in water, which would hinder the necessary chemical reactions. The solubility of Urea at 20 °C is 107.9 g/100 ml, indicating that a diluted solution is essential for optimal performance in SCR applications.

PREREQUISITES
  • Understanding of Selective Catalytic Reduction (SCR) systems
  • Knowledge of Urea's chemical properties and solubility
  • Familiarity with ammonia's role in SCR technology
  • Basic chemistry concepts related to reactants and solutions
NEXT STEPS
  • Research the chemical properties of Urea and its solubility at various temperatures
  • Learn about the functioning of Selective Catalytic Reduction (SCR) systems
  • Investigate alternatives to Adblue and their effectiveness in SCR applications
  • Explore the environmental impact of ammonia emissions and SCR technology
USEFUL FOR

Automotive engineers, environmental scientists, and anyone involved in emissions control technologies will benefit from this discussion.

James125
Messages
19
Reaction score
0
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
 
Engineering news on Phys.org
because 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.
 
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.
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 3 ·
Replies
3
Views
5K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
13
Views
6K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 4 ·
Replies
4
Views
7K
Replies
9
Views
2K
  • · Replies 2 ·
Replies
2
Views
7K
  • · Replies 3 ·
Replies
3
Views
3K