I ran into a site that talked about ammonia production. its a 2 step process using the haber process. You take natural gas,(methane) and react it with steam. The result is:
CH4 + 2(H2O)
CO2 + 8H
I don't suppose that a fogger or steamed water in the intake with methane would work. I hear that methane is highly corrosive, So I suppose that the mixture would really need to happen in a high pressure canister on board.
I dunno, just thinking outloud again.
Another thought, is if carbon is able to attach 4 H atoms, what are its implications as a catalyst in an electrolyzer? Would tungsten carbide work as a cathode? I am not sure about galvanization of super hard metals like tungsten or platinum, anyone know?