you missed the thread from a few days ago on this??
All you need is a secret cation exchange module, a metal catalyst reactor system,
and the electric
power from a nuclear reactor, and then bingo! you can produce a thimble full of fuel!
Using an innovative and proprietary NRL electrolytic cation exchange module (E-CEM), both dissolved and bound CO2 are removed from seawater at 92 percent efficiency by re-equilibrating carbonate and bicarbonate to CO2 and simultaneously producing H2. The gases are then converted to liquid hydrocarbons by a metal catalyst in a reactor system.