Ability of hydrogen storage CeNi5-xGax and Mg2Ni alloys to hydrogenate acetylene

Ryota Tsukuda, Ryo Yamagishi, Satoshi Kameoka, Chikashi Nishimura, An Pang Tsai

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Hydrogen storage properties and reactivity for hydrogenation of acetylene in a series of CeNi5-xGax (x = 0, 0.5, 0.75, 1, 1.25, 1.5) alloys and Mg2Ni were determined and compared. The structure of CeNi5 (CaCu5 type) was maintained up to CeNi3.5Ga1.5 when Ni was replaced by Ga. The replacement facilitated hydrogenation absorption by creating larger interstitial spaces through expansion of the lattice, allowing CeNi4.25Ga0.75 to absorb the greatest proportion of hydrogen atoms among the alloys under the same conditions. The results showed that the absorbed hydrogen in CeNi3.75Ga1.25 improved reactivity. In contrast, Mg2Ni formed a hydride upon hydrogenation of acetylene and thus possessed much lower activity. The difference of the activity of absorbed hydrogen between CeNi5-xGax and Mg2Ni was confirmed from transient response tests under reaction gases alternately containing He and H2.

    Original languageEnglish
    Pages (from-to)774-785
    Number of pages12
    JournalScience and Technology of Advanced Materials
    Volume20
    Issue number1
    DOIs
    Publication statusPublished - 2019 Dec 31

    Keywords

    • 106 Metallic materials
    • 205 Catalyst / Photocatalyst / Photosynthesis
    • 206 Energy conversion / transport / storage / recovery
    • 212 Surface and interfaces
    • 50 Energy Materials
    • 504 X-ray / Neutron diffraction and scattering
    • CeNiGa
    • Intermetallic compound catalyst
    • MgNi
    • hydrogen storage alloy
    • hydrogenation of acetylene
    • reactivity of hydride

    ASJC Scopus subject areas

    • Materials Science(all)

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