1. Hydrogenation of acetylene and propyne over hydrogen storage ErNi5-xAlxalloys and the role of absorbed hydrogen
- Author
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Satoshi Kameoka, Daisuke Okuyama, An Pang Tsai, Ryota Tsukuda, Chikashi Nishimura, and Takayuki Kojima
- Subjects
Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Inorganic chemistry ,Intermetallic ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Propyne ,01 natural sciences ,0104 chemical sciences ,Catalysis ,Hydrogen atmosphere ,chemistry.chemical_compound ,Hydrogen storage ,Fuel Technology ,Acetylene ,chemistry ,0210 nano-technology ,Catalytic hydrogenation - Abstract
The hydrogen storage properties of ErNi5-xAlx (x = 0, 0.5, 0.75, 1, 1.25, and 1.5) alloys were investigated by pressure-composition isotherms and in situ X-ray diffraction measurements under a hydrogen atmosphere. Catalytic reactivities toward the hydrogenation of alkynes (acetylene and propyne) over ErNi5-xAlx (x = 0, 1, and 1.5) alloys were also studied and the contribution of absorbed hydrogen to hydrogenation is discussed. All ErNi5-xAlx alloys possess a hexagonal structure (CaCu5-type) with the space group P6/mmm. The substitution of Al for Ni facilitated hydrogen absorption at lower hydrogen pressures by the formation of larger interstitial spaces. ErNi3.5Al1.5Hn with absorbed hydrogen showed higher reactivities for the catalytic hydrogenation of acetylene and propyne than ErNi5 and ErNi4Al without absorbed hydrogen. The reason for this was concluded to be that absorbed hydrogen activates adsorbates (acetylene and hydrogen) that are supplied from the gas phase.
- Published
- 2020