>You can make methane gas from pure CO2 and hydrogen when you apply electric power as a catalyst. You can make methane gas from pure CO2 and hydrogen period. T

>You can make methane gas from pure CO2 and hydrogen when you apply electric power as a catalyst. You can make methane gas from pure CO2 and hydrogen period. The reaction is exothermic, it's just the Sabatier method. You could however use electricity to split water into hydrogen and oxygen.