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Passive thermal management of CO2 Methanation using phase change material with high thermal conductivity

Author

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  • Koide, Hiroaki
  • Gunji, Akira
  • Sugimasa, Masatoshi
  • Kawaguchi, Takahiro
  • Tamzysi, Cholila
  • Nomura, Takahiro

Abstract

CO2 methanation is a promising technology for fuel decarbonization. Since methanation is an exothermic reaction, thermal management of the reactor is an important issue. This study investigated the effect of applying metallic phase change material(PCM) for reactor thermal management. In this study, Zn-30 %Al alloy(melting point: 429–509 °C)-based PCM composites were mixed with catalysts in a bench scale reactor, then steady-state and transient methanation were examined. The results at steady state indicated peak temperature was reduced from 464 °C to 411 °C compared to conventional single-catalyst condition. This corresponded to 38 % reduction in the temperature difference between peak and base temperature. Furthermore, temperature distribution in the whole reactor was homogenized, achieving a dispersion of the local thermal stress. This was due to high thermal conductivity of metallic PCM. Then, transient thermal management of PCM was evaluated. Periods for temperature increase between 430 and 450 °C, including PCM melting point, was prolonged 45 min compared to the condition without PCM. This resulted 71 % suppression of exothermic speed. This was due to complex effects of latent heat and high thermal conductivity of metallic PCM, offering thermal buffer in case of catalyst thermal runaway. These results showed the introduction of metallic PCM into methanation reactor provides novel thermal management.

Suggested Citation

  • Koide, Hiroaki & Gunji, Akira & Sugimasa, Masatoshi & Kawaguchi, Takahiro & Tamzysi, Cholila & Nomura, Takahiro, 2025. "Passive thermal management of CO2 Methanation using phase change material with high thermal conductivity," Applied Energy, Elsevier, vol. 380(C).
    • Handle: RePEc:eee:appene:v:380:y:2025:i:c:s0306261924023250
    DOI: 10.1016/j.apenergy.2024.124942
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    References listed on IDEAS

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    1. Kawaguchi, Takahiro & Sakai, Hiroki & Sheng, Nan & Kurniawan, Ade & Nomura, Takahiro, 2020. "Microencapsulation of Zn-Al alloy as a new phase change material for middle-high-temperature thermal energy storage applications," Applied Energy, Elsevier, vol. 276(C).
    2. Thema, M. & Bauer, F. & Sterner, M., 2019. "Power-to-Gas: Electrolysis and methanation status review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 775-787.
    3. Philipp Biegger & Florian Kirchbacher & Ana Roza Medved & Martin Miltner & Markus Lehner & Michael Harasek, 2018. "Development of Honeycomb Methanation Catalyst and Its Application in Power to Gas Systems," Energies, MDPI, vol. 11(7), pages 1-17, June.
    4. Fukahori, Ryo & Nomura, Takahiro & Zhu, Chunyu & Sheng, Nan & Okinaka, Noriyuki & Akiyama, Tomohiro, 2016. "Macro-encapsulation of metallic phase change material using cylindrical-type ceramic containers for high-temperature thermal energy storage," Applied Energy, Elsevier, vol. 170(C), pages 324-328.
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