Ammonia as a fuel is an absurdly stupid idea. It is trading the lives and safety of crews and passengers for a bit of money.
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Basically, an ammonia leak will kill you. By itself. The others are only a problem if they're the right concentrations to ignite. That's a relatively high concentration and a larger leak. Much smaller leaks of ammonia are deadly.
It's still a good solution for some things, but it's a bad solution for consumer vehicles like cars for that reason.
So the ammonia doesn't need to be useful in itself, but only to be able to be converted on-site to something more storable (more stable, liquefaction at lower pressure or higher temperature, and so on), or alternatively something more useful that could displace other standard CO2-intensive industrial processes.
But there's no reason that needs to be true for e.g. automated shipping industries. The danger to the water seems relatively low as well, as water dilution seems to be one of the best ways to deal with spillages. I'm uncertain the environmental repercussions, however it does seem to be the case that aquatic mammals and humans have natural methods of elimination, making it a game of concentration and dispersion vs e.g. an oil spill that is both highly toxic and nearly impossible to properly clean up.
The majority of other applications are industrial (fertilizer, energy storage): there are major issues with our current distribution systems, cheap ammonia batteries could be the key to efficient electricity and hydrogen production and distribution.
Ammonia is NH3, there's no CO2 to store.
> alternatively something more useful that could displace other standard CO2-intensive industrial processes.
Except they are talking about using it as a fuel. If you want to displace CO2 at least use methanol, it's a liquid that's more energy dense and easier to handle safely.