Preparation
Electrolysis
Hydrogen is prepared by the electrolysis of brine. It is prepared at the cathode.
Steam reforming
CH4 + H2O(g) –> CO+ 3H2 (Ni catalyst 700oC)
CO + H2O(g) –> CO2 + H2 (Fe catalyst 400oC)
K2CO3 + H2O + CO2 –> 2KHCO3 (to remove CO2 from the mixture)