Effect of variation in hydrogen content on catalytic properties of Zr7Ni10 hydrogen storage alloy

Shu Mizutome; Nodoka Sasaki; Kohta Asano; Kouji Sakaki; Ya Xu; Satoshi Kameoka

doi:10.1016/j.nxmate.2025.101313

Article Effect of variation in hydrogen content on catalytic properties of Zr7Ni10 hydrogen storage alloy

Shu Mizutome ; Nodoka Sasaki ; Kohta Asano ; Kouji Sakaki ; Ya Xu (National Institute for Materials Science) ; Satoshi Kameoka

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Shu Mizutome, Nodoka Sasaki, Kohta Asano, Kouji Sakaki, Ya Xu, Satoshi Kameoka. Effect of variation in hydrogen content on catalytic properties of Zr7Ni10 hydrogen storage alloy. Next Materials. 2025, 9 (), 101313. https://doi.org/10.1016/j.nxmate.2025.101313

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Hydrogen storage alloys are expected to be catalyst materials for the hydrogenation of hydrocarbons and carbon dioxide. The role of hydrogen absorbed in the hydrogen storage alloy catalysts has been investigated from the perspectives of the hydrogen supplying itself as a reactive species and changing the chemical state of the alloy catalysts. However, few studies have considered the catalysts’ hydrogen storage properties under the reaction fields. To investigate the relationship between the hydrogen storage properties and the catalytic properties, we focus on Zr7Ni10 alloy, which exhibits a unique phase-transition process involving two hydride phases (β phase and γ phase) and a broad solid-solution region of the hydrogen solid-solution phase (α phase). The catalytic properties of Zr7Ni10 were examined for the hydrogenation of acetylene under conditions where the phase transitions occurred and the hydrogen content of the α phase varied. The results showed that the α phase exhibited higher rates of acetylene conversion than the degassed alloy. Below 230 ◦C, where the phase transitions occurred, Zr7Ni10 showed higher catalytic activity with increasing temperature but the difference among the phases could not be observed. However, above 230 ◦C, where the hydrogen content of the α phase decreased with increasing temperature, the catalytic activity also decreased. During the subsequent cooling process, where the hydrogen content of the α phase increased, the catalytic activity recovered. Considering a board solid-solution region of the α phase, we concluded that the variation in hydrogen content of the α phase induced the reversible catalytic activity behavior.

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