Browsing by Author "Nakajima, Hironori"

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Development of CO2 hydrogenation-water electrolysis tandem reactor
(51st International Conference on Environmental Systems, 7/10/2022) Shima, Asuka; Sone, Yoshitsugu; Sakurai, Masato; Nakajima, Hironori; Inoue, Mitsuhiro; Abe, Takayuki
As a new ECLSS technology for future manned space missions, the authors have developed a tandem water electrolysis and CO2 hydrogenation reactor to generate methane and water. The reactor concept is based on a water electrolyzer thermally coupled to a CO2 hydrogenation reactor which directly transfers thermal energy generated by the catalytic CO2 methanation (as known as the Sabatier reaction) to the water electrolyzer. In this paper, we report that 1 L/min-scale hydrogen production with corresponding CO2 methanation was achieved by further developing a scale-model tandem reactor.
Development of CO2 Reduction-Water Electrolysis Tandem Device as a Full-Scale Model
(2023 International Conference on Environmental Systems, 2023-07-16) Shima, Asuka; Shima, Asuka; Sakurai, Masato; Sone, Yoshitsugu; Nakajima, Hironori; Inoue, Mitsuhiro; Abe, Takayuki
This study describes an advanced tandem reactor for environmental control and life support systems (ECLSS). The reactor consists of a low-temperature (220°C) Sabatier reactor producing water and methane (CH4) from carbon dioxide (CO2) and hydrogen (H2) and a thermally coupled water electrolysis cell with a proton exchange membrane (PEM). The Sabatier component generates heat energy used to operate a tandem water electrolyzer and is thermally self-sustaining. A previous, subscale reactor generated 1 L/min of hydrogen (H2) for the Sabatier reaction and achieved 93 % CO2 conversion. The model electrolyzer used in this study currently generates H2 at 3.6 L/min, which the Sabatier reactor can use to convert 1.58 L/min of CO2 to CH4 as much as possible.
Improvement of the Full-Scale Model of Carbon Dioxide Reduction-Oxygen Production Tandem Reactor
(2024 International Conference on Environmnetal Systems, 2024-07-21) Shima, Asuka; Sakurai, Masato; Sone, Yoshitsugu; Nakajima, Hironori; Inoue, Mitsuhiro; Abe, Takayuki
The authors have developed a carbon dioxide reduction-water electrolysis tandem reactor as a new concept of ECLSS technology. Previously, the prototyped full-scale model achieved a hydrogen generation of ca. 3.6 L/min and the corresponding Sabatier reaction. This report presents the modification of both the Sabatier reaction part and the water electrolysis part in the full-scale reactor to improve the reactor's pressure conditions and the durability of the oxygen generation part.