Effect of Molecular Nitrogen on Multiple Hydrogen Occupancy in Clathrate Hydrates

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Multiple H-2 occupancy in confined cages has been explored for the purpose of enhancing storage capacity. Furthermore, balancing the formation pressure with high storage capacity is one of the most significant factors. Here, we demonstrate the use of binary (LGM + N-2) hydrates to capture hydrogen clusters under relatively mild conditions, even observing double H-2 occupancy in small cages. The cage occupancy and structures of hydrates were identified by the Raman spectroscopic analysis and high-resolution powder diffraction. The reaction product of binary (LGM + N-2) hydrates with H-2 molecules suggests the possibility of multiple H-2 occupancy in both small (5(12)) and large (5(12)6(4)) cages at relatively low pressures. Also, the lattice parameter decreases with an increase in H-2 occupancy. The unique and abnormal role of N-2 as a preoccupied coguest significantly affects the H-2 population in a crystalline hydrate matrix and further lowers the pressure for structure stabilization.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-09
Language
English
Article Type
Article
Keywords

CARBON-DIOXIDE; RAMAN-SPECTROSCOPY; METHANE HYDRATE; STORAGE; CLUSTERS; DYNAMICS

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.118, no.35, pp.20203 - 20208

ISSN
1932-7447
DOI
10.1021/jp5061254
URI
http://hdl.handle.net/10203/191086
Appears in Collection
CBE-Journal Papers(저널논문)
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