The Sabatier reaction involves hydrogenÂ andÂ carbon dioxideÂ reacting at elevated pressuresÂ andÂ temperatures (aboveÂ 300Â°C) in the presence of aÂ catalystÂ to produceÂ methaneÂ and water. Catalysts may be nickel orÂ ruthenium.
- CO2Â + 4 H2Â â CH4Â + 2 H2O + energy
- âH = â165.0 kJ/mol
Such a reactor isÂ not ultimately preferred to photosynthesis as a means to make use of CO2Â inside a CELSS. However the SabatierÂ technique is perhaps favorable during the construction of a habitat on Mars for instance, where CO2Â and H2O are available (H2O can be electrolyzed to make H2Â and O2 gas), before plants can be established. CH4 (methane) can be used as fuel for heating, cooking, energy storage, and transportation.