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A comment on Hydrogen derived from ammonia could open up new export market for Australia. Parent comment

Re:Hydrogen derived from ammonia could open up new export ma... by fsloth on Wednesday August 08, 2018 @07:13AM (#17714862)
"what does the chemical reaction look like when harvesting hydrogen from ammonia?"

Reverse Haber process maybe?

2NH3 -> N2 + 3H2

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Re:Hydrogen derived from ammonia could open up new export ma... by CompelTechnic on Wednesday August 08, 2018 @08:51AM (#17715445)
I wonder, does converting ammonia to hydrogen absorb energy or release it? (Ie is it endothermic or exothermic?)
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Re:Hydrogen derived from ammonia could open up new export ma... by marcosdumay on Wednesday August 08, 2018 @11:22AM (#17716656)
It's highly endothermic. Replacing the hydrogen with oxygen is exothermic.

So one can create some ammonia-air fuel cell. But reducing it first to push the hydrogen into a fuel cell will almost surely net a negative amount of energy because of the losses.

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Re:Hydrogen derived from ammonia could open up new export ma... by refurb on Wednesday August 08, 2018 @08:57AM (#17715486)
Exothermic as the reverse is endothermic.
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Re:Hydrogen derived from ammonia could open up new export ma... by gonvaled on Wednesday August 08, 2018 @07:35AM (#17714977)
How would this work in an ammonia-powered battery?
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Re:Hydrogen derived from ammonia could open up new export ma... by gvb on Wednesday August 08, 2018 @09:00AM (#17715507)
It doesn't. The membrane "cracks" the ammonia into N2 and H2. The N2 is released to the atmosphere. The H2 is used in a hydrogen fuel cell to power an electrical drivetrain or in an internal combustion engine with a mechanical drivetrain.
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Re:Hydrogen derived from ammonia could open up new export ma... by gonvaled on Wednesday August 08, 2018 @09:12AM (#17715594)
how do you regulate the membrane? does it degrade?
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