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For those looking (like me) for the catch:
Ammonia does have drawbacks. It’s toxic. Nearly all of it currently is made from natural gas in a process that is harmful for the climate. And burning it has to be engineered carefully or it, too, yields traces of a powerful greenhouse gas.
If you have solar paired with proton exchange membrane electrolysis, you can generate hydrogen very economically. PEM electrolyzers are already around 80% efficient but supply is limited right now. Hydrogen is a pain to store, but if you feed that hydrogen into the Haber-Bosch process you can very efficiently produce ammonia. Ammonia fuel cells are very promising if you're looking to decarbonize container shipping.
Ah so the ammonia solves the storage issues, thanks for sharing
In terms of vapor pressure, ammonia behaves a lot like propane. You can store it pretty much like propane, liquified under pressure, but it has less energy density and high heat of evaporation so it's best to withdraw it as liquid to not freeze out container
This is the trick. It will be cheaper to make it from natural gas so that is how it will be made.
So you’re saying when the boat eventually crashes and all the ammonia is dumped into the sea, that’s probably gonna be bad?
Well they’re full of the shittiest oil money can buy nowadays so ammonia may be a net neutral in comparison
What if it’s an oil tanker powered by ammonia? ;)
So what was the point of this?
It can be produced in a renewable manner even if it currently usually isn't (though it is a net consumer of energy to create it that way, so it's more like a sort of battery when used that way than an energy source), so if the downsides can be worked around and the economics worked out (a difficult proposition I expect given hydrogen is in a similar position and all the issues that one has) it has potential to work as a renewable vehicle fuel.
Eh, I think it’s ok that they’re trying something, even if I doubt it will work out.
We used to have home refrigerators kept cold by ammonia. There’s a reason we don’t use those anymore.
This doesn't store ammonia in a house, nor does it burn it directly. It cracks it into hydrogen to fuel the ship, and harmless nitrogen as a by-product.
I believe that some (all?) big commercial refrigeration systems use ammonia.
But they keep all the ammonia on the roof.
Captained by R. Kelly
It’s an older joke, sir, but it checks out