The results of our study show that propellant production on Mars is possible via two promising process concepts depending and the specific site and scenario. Since our results are based on thermodynamic modelling, only, additional kinetic investigations are needed for sizing and estimating the mass of the major equipment in upcoming work. Therefore, combination of simulations with experimental investigations establish the basis for more detailed concepts of the unit operations. One of the major design criterions, beside the mass of the overall unit, are the robustness of the process and the ability to provide the required propellant purity.