RogueRose
International Hazard
Posts: 1593
Registered: 16-6-2014
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Diesel Exhaust Fluid - Urea - catalyzed ammonia to N2?
I'm pretty confused as to what is happening in this DEF system and it seems the opposite of experiments we have done to convert ammonia to NO2..
The DEF/urea solution is injected at the exhaust manifold and it decomposes to Ammonia and isocyanic acid - the ICA then hydrolyzes to ammonia and
CO2. Then the gases pass through the Catalytic converter, supposedly turning it into N2.
Now the experiments that some have done using Pl/Pd is converting NH3 to NO2. How can the same process do both?
https://en.wikipedia.org/wiki/Diesel_exhaust_fluid
[Edited on 4-12-2019 by RogueRose]
[Edited on 4-13-2019 by RogueRose]
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rockyit98
Hazard to Others
Posts: 283
Registered: 12-4-2019
Location: The Known Universe
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Mood: no mood is a good mood
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Diesel and Urea
Periodic Video
The Professor discusses some of the chemistry behind the recent controversy involving Volkswagen cars.
https://www.youtube.com/watch?v=WkpoL-aQbdI
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wg48temp9
National Hazard
Posts: 784
Registered: 30-12-2018
Location: not so United Kingdom
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Quote: Originally posted by RogueRose  | I'm pretty confused as to what is happening in this DEF system and it seems the opposite of experiments we have done to convert ammonia to NO2..
The DEF/urea solution is injected at the exhaust manifold and it decomposes to Ammonia and isocyanic acid - the ICA then hydrolyzes to ammonia and
CO2. Then the gases pass through the Catalytic converter, supposedly turning it into N2.
Now the experiments that some have done using Pl/Pd is converting NH3 to NO2. How can the same process do both? |
Catalysts only change the rate of the reaction by reducing the energy barrier to the reaction they are therefore inherently reversible.
For example you can use sulphuric acid to catalyze the creation an ester and you can use sulphuric acid to hydrolyse an ester back into the original
reactants.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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