Why use Adblue and not use 100% Urea?

  • Thread starter James125
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In summary, Adblue is used instead of 100% Urea because it is a more efficient and cost-effective solution for reducing harmful emissions from diesel engines. It is a mixture of 32.5% high-purity synthetic urea and 67.5% deionized water, making it easier to handle and store. Adblue is injected into the exhaust stream of diesel engines, where it breaks down into ammonia and reacts with harmful nitrogen oxides to convert them into harmless nitrogen and water vapor. While pure urea can also be used, Adblue is more effective due to its controlled and precise injection. It is safe to use, non-toxic, non-flammable, and biodegradable, but proper handling
  • #1
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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
 
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  • #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.
 
  • #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.
 

1. Why is Adblue used instead of 100% Urea?

Adblue is used instead of 100% Urea because it is a more efficient and cost-effective solution for reducing harmful emissions from diesel engines. Adblue is a mixture of 32.5% high-purity synthetic urea and 67.5% deionized water, which makes it easier to handle and store compared to pure urea.

2. How does Adblue help reduce emissions?

Adblue is injected into the exhaust stream of diesel engines, where it breaks down into ammonia. The ammonia then reacts with the harmful nitrogen oxides (NOx) in the exhaust gas, converting them into harmless nitrogen and water vapor. This process helps reduce emissions of nitrogen oxides, which contribute to air pollution and smog.

3. Can't pure urea be used instead of Adblue?

While pure urea can also be used for reducing emissions, it is not as effective as Adblue. The mixture of urea and water in Adblue allows for a more controlled and precise injection into the exhaust stream, resulting in better conversion of nitrogen oxides.

4. Is Adblue safe to use?

Yes, Adblue is safe to use. It is non-toxic, non-flammable, and biodegradable. However, it is important to handle it with care and follow proper storage and handling guidelines to avoid any potential hazards.

5. Do all diesel engines require Adblue?

No, not all diesel engines require Adblue. Adblue is only necessary for diesel engines that are equipped with selective catalytic reduction (SCR) systems, which are designed to reduce emissions. However, many modern diesel vehicles and trucks are now equipped with SCR systems, making Adblue a common and necessary component for reducing emissions.

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