
Exploration of heterogeneous catalyst for molecular hydrogen ortho-para conversion
Hideki Abe, Hiroshi Mizoguchi, Ryuto Eguchi, Hideo Hosono
Exploration ›› 2024, Vol. 4 ›› Issue (3) : 20230040.
Exploration of heterogeneous catalyst for molecular hydrogen ortho-para conversion
Molecular hydrogen (H2) ortho-para conversion (O/P conversion) proceeds slowly at low temperatures accompanying a heat release. Thus, catalysts for accelerating this conversion rate arehighly demanded in termsof the storage andutilizationof liquid H2. The catalysts for this purpose are experimentally screened by examining a broad range of materials covering magnetic, non-magnetic, metallic, and nonmetallic oxides. The primary conclusions obtained are summarized below. (1) activematerials are required to be non-metallic and to bear the cations with ionic radii smaller than the bond length of H2. (2) Metallicmaterials have almost no activity irrespective of with or withoutmagnetism (3) The activity of materials belonging to (1) is largely enhanced when the constituting cation has a magnetic moment. In addition, there is a class of materials for which the activity is distinctly enhanced just upon substitution by the foreign ions.
catalyst / hydrogen / hydrogen economy / hydrogen liquefaction / ortho-para conversion
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