Thermochemical hydrogen production: past and present

The processes for hydrogen production discussed in this paper are those for which water is the only material input and hydrogen and oxygen are the only material outputs:H2O+X→XO+H2XO→X+1/2O2—————————————−H2O→H2+1/2O2 rmore, the required energy inputs are meant to be mainly heat (rather than useful work, such as electricity). As shown above, these processes may be visualized as a set of chemical reactions which sum the decomposition of water.