Ability of hydrogen storage CeNi5-xGax and Mg2Ni alloys to hydrogenate acetylene. Issue 1 (31st December 2019)

• Record Type: Journal Article
• Authors: Tsukuda, Ryota; Yamagishi, Ryo; Kameoka, Satoshi; Nishimura, Chikashi; Tsai, An-Pang
• Is Part Of: Science and technology of advanced materials. Volume 20:Issue 1(2019)
• Page Start: 774
• Page End: 785
• Publication Date: 2019-12-31
• Subjects: Intermetallic compound catalyst -- hydrogen storage alloy -- hydrogenation of acetylene -- CeNi5-xGax -- Mg2Ni -- reactivity of hydride; 50 Energy Materials -- 106 Metallic materials -- 205 Catalyst / Photocatalyst / Photosynthesis -- 206 Energy conversion / transport / storage / recovery -- 212 Surface and interfaces -- 504 X-ray / Neutron diffraction and scattering; Materials -- Technological innovations -- Periodicals; 620.112
• DOI: 10.1080/14686996.2019.1629836
• Languages: English
• ISSNs: 1468-6996

Abstract

ABSTRACT: Hydrogen storage properties and reactivity for hydrogenation of acetylene in a series of CeNi5- x Ga x ( x = 0, 0.5, 0.75, 1, 1.25, 1.5) alloys and Mg2 Ni were determined and compared. The structure of CeNi5 (CaCu5 type) was maintained up to CeNi3.5 Ga1.5 when Ni was replaced by Ga. The replacement facilitated hydrogenation absorption by creating larger interstitial spaces through expansion of the lattice, allowing CeNi4.25 Ga0.75 to absorb the greatest proportion of hydrogen atoms among the alloys under the same conditions. The results showed that the absorbed hydrogen in CeNi3.75 Ga1.25 improved reactivity. In contrast, Mg2 Ni formed a hydride upon hydrogenation of acetylene and thus possessed much lower activity. The difference of the activity of absorbed hydrogen between CeNi5- x Ga x and Mg2 Ni was confirmed from transient response tests under reaction gases alternately containing He and H2 . Graphical abstract: uf0001