[Hostage]

Ammonia NH3 is made from many sources as is methane and natural gas.

[stboz]

You want massive amounts of ammonia? Then you will use steam reforming of natural gas to yield hydrogen. You will then mix the hydrogen with air, compress the mixture, pass it over a catalyst to get your ammonia. You will then have to cool and liquefy the ammonia to store it.

You will expend much energy. Thermodynamics rules!

[alloysteel]

Ammonia (NH3) combines readily with a number of different compounds, and can exist as a liquid at ambient temperatures if retained under pressure. Apparently this technology of sending it over a catalyst to form free hydrogen and nitrogen, in order to power fuel cells, may be workable, but still a bit awkward in application.

In fact, the "exhaust" of this process will be three parts of N2 gas with one part of H2O, and since some 78% of our atmosphere is ALREADY free nitrogen, the additional N2 cannot be considered a pollutant. The side reaction, the formation of nitrogen oxides, is relatively minor, and may not proceed to any significant degree at all. Nitrogen combines with oxygen only extreme conditions of heat and/or pressure (Lightning bolt or inside an internal combustion engine), so this objection could be discounted for the purposes of operating a fuel cell.