Furthermore, a mass reduction of the unit can be expected, which lowers mission costs, especially when considering the high mass-bound transportation costs in space travel . provides nearly full conversion and a selectivity near 1 as well as sufficient production rate from thermodynamic perspective. Note that the stoichiometric H2/CO2 ratio is 4, which means that the H2 conversion is smaller than the CO2 conversion for all cases for which H2/CO2 > 4.