Exploration of heterogeneous catalyst for molecular hydrogen ortho‐para conversion

Author:

Abe Hideki12ORCID,Mizoguchi Hiroshi3ORCID,Eguchi Ryuto4ORCID,Hosono Hideo35ORCID

Affiliation:

1. Center for Green Research on Energy and Environmental Materials National Institute for Materials Science (NIMS) Tsukuba Ibaraki Japan

2. Graduate School of Science and Technology Saitama University Saitama Japan

3. Research Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Tsukuba Ibaraki Japan

4. Faculty of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki Japan

5. MDX Research Center for Element Strategy International Research Frontiers Initiative Tokyo Institute of Technology Yokohama Japan

Abstract

AbstractMolecular hydrogen (H2) ortho‐para conversion (O/P conversion) proceeds slowly at low temperatures accompanying a heat release. Thus, catalysts for accelerating this conversion rate are highly demanded in terms of the storage and utilization of 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) active materials are required to be non‐metallic and to bear the cations with ionic radii smaller than the bond length of H2. (2) Metallic materials have almost no activity irrespective of with or without magnetism (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.

Funder

Japan Science and Technology Agency

Publisher

Wiley

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