We have recently demonstrated the viability of a polymeric reactor for use in the low-temperature conversion of CO2 to Methane, as well as identified Ru/TiO2 as the most active catalyst at mild process conditions . In this study, we expand our previous work by using a Ru/TiO2 catalyst in both a PTFE and PFA based reactor and measure the activity and temperature throughout a wide range of process conditions. After the reaction the reactors are tested with light microscopy and Raman confocal microscopy to evaluate material robustness and draw conclusions for the particular case of applications beyond earth and more general applications on earth.