and therefore a methane production capacity of ca. 0.90 kg/d assuming 130 g catalyst, as well. Hence, our concept in the conservative case provides the threefold production capacity as reported by Zubrin et al., but at significantly lower temperature. On top of that, the production rate can be doubled by operating at 220 °C, while higher Ru-loadings will increase the specific productions rates by another factor of 10 or more. Since the use of polymeric materials in chemical reactions system may lead to further mass reduction of the production unit, very attractive mass specific productivities are possible after further optimizations.