Electric marine craft will revolutionize coastal operations but not long-haul shipping - FreightWaves
The shipping industry is thinking about fuel evolution towards a zero carbon economy. According to this article, the best guess is that long haul shipping will switch to natural gas, but it won't be a very long lived fuel for the fleet. Further out, they're thinking this will be hydrogen.
And that has me wondering - maybe somebody here can answer. I'm assuming that the hydrogen in these cases (where we're talking about long term fuel in a zero carbon world) is generated from renewable energy, rather than coming from a hydrocarbon source. The thing I don't understand is why there is so much interest in producing hydrogen from renewable energy as opposed to producing methane from renewable energy.
In both cases, the produced product is really an energy storage product. I don't work in the field, or know the chemistry really well, but it seems like there's a lot of reasons to love methane over hydrogen. Methane is a gas at normal temperatures and pressures, but becomes a liquid at -164C (and 1 atmosphere).
Methane - Wikipedia
It looks like hydrogen is a liquid below -253C (~20K). And hydrogen has lots of other problems with it due to the size of the molecules (metal embrittlement, works its way through most containment vessels, more).
Hydrogen - Wikipedia
So my outsider view of things - it looks like we've got much more widespread systems for managing liquid methane (roughly the same as natural gas) than we do hydrogen, it's less dangerous to be working with at all - so why not be using the excess renewable energy to manufacture liquid methane than hydrogen?
I feel like there is something I'm missing