Study on absorption/desorption characteristics of a metal hydride tank for boil-off gas from liquid hydrogen

Akihiro Nakano, Tetsuhiko Maeda, Hiroshi Ito, Masao Masuda, Yoshiaki Kawakami, Manabu Tange, Toru Takahashi, Keiichi Nishida

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We have been performing research on the Totalized Hydrogen Energy Utilization System (THEUS) which has applications to commercial buildings and a planned added function of supplying energy to stations for hydrogen and electric vehicles. In that case we will utilize liquid hydrogen transported from a hydrogen station and all Boil-Off Gas (BOG) will be recovered in THEUS's metal hydride tanks. It is known that BOG is chiefly composed of para-hydrogen, which has different thermo-physical properties from normal hydrogen. It has been reported that some metal hydride alloys work as a catalyst to accelerate the para-ortho conversion and the conversion proceeds relatively fast in the case of La-Ni 5. The conversion is considered to be an endothermic reaction. A misch metal (Mm)-Ni 5 metal hydride alloy, which contained La and Ni, was used in our THEUS metal hydride tank. To examine the effect of the para-ortho conversion on the THEUS operation, we investigated the absorption/desorption characteristics of the metal hydride tank with BOG. We confirmed that the effect of the heat of conversion was very small and BOG could be treated as normal hydrogen for practical application.

Original languageEnglish
Pages (from-to)5056-5062
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number6
Publication statusPublished - 2012 Mar


  • Hydrogen storage
  • Liquid hydrogen
  • Metal hydride
  • Normal hydrogen
  • Para-hydrogen

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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