Preliminary Study of CO2 Electrolysis in Ionic Liquid



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49th International Conference on Environmental Systems


Resources are extremely limited in spacecraft, and oxygen consumed for breathing also needs regeneration. In the system using the current Sabatier reaction (CO2 + 4H2 → CH4 + 2H2O), O2 can only be collected up to about 50% in principle out of CO2 contained in the exhalation breath of the astronaut. This is because it loses H2 by throwing CH4 produced as a byproduct into outer space. In order to further improve the recovery rate of O2, there is a method such as carbon production from methane and CO2, but a high temperature of 1,000 to several hundred degrees is necessary, and since carbon adheres to the surface of the catalyst, a lot of single-use type catalysts are required. Unlike the usual Bosch reaction in the gas phase, this study uses a process like the Bosch reaction for producing carbon from CO2 using electrolysis in an ionic liquid and reacts at low temperature (room temperature to 500 oC). This result suggests that the possibility of a system in which the replenishment amount of catalyst and energy are suppressed extremely.


The 49th International Conference on Environmental Systems was held in Boston, Massachusetts, USA on 07 July 2019 through 11 July 2019.
ICES302: Physio-chemical Life Support- Air Revitalization Systems -Technology and Process Development
Masato Sakurai, Japan Aerospace Exploration Agency (JAXA), Japan
Asuka Shima, Japan Aerospace Exploration Agency (JAXA), Japan
Kazuyuki Iwasaki, Doshisha University, Japan
Yoshiyuki Sometani, Doshisha University, Japan
Takuya Goto, Doshisha University, Japan
Yasuhiro Fukunaka, Waseda University, Japan
Mitsuhiro Kanakubo, National Institute of Advanced Industrial Science and Technology (AIST), Japan


ECLSS, Air Revitalization, CO2 Electrolysis, Carbon formation