The CO2 hydrogenation reactions are typically performed in fixed-bed reactors using Ni-based porous solid catalysts. The major challenge is the exothermic nature of the reaction and the limitation of conversion due to thermodynamic constraints. Therefore, industrial scale plants (e.g., from Air Liquide and Haldor Topsøe) use a cascade of adiabatic fixed-bed reactors with intermediate cooling or the partial recycling of product streams for heat integration and removal of the released reaction heat . Furthermore, the recycle possess an additional degree of freedom in process operation, which provides improved flexibility in particular for dynamic operation . In order to push the thermodynamic constraints, the operation under overstoichiometric H2/CO2 feed ratios appears to be a promising concept, as evidenced by literature . This method is particularly suitable for ISRU, since it is easily feasible without of additional unit operations .