Structural transition of trimethylamine semi-hydrate by methane inclusion

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Recently, several alkylamine hydrates have been studied in an effort to reveal the structural transitions from semi-to 'canonical' clathrate hydrate in the presence of secondary guest molecules. Trimethylamine (TMA) is known to form the semi-clathrate hydrate, and it has been reported that the structural transition of the TMA semi-clathrate hydrate may not occur in the presence of hydrogen gas as a secondary guest molecule. In this study, we investigate the structural transition of TMA hydrate by CH4 gas. Powder X-ray diffraction was used to analyze the crystal structure of a binary (TMA + CH4) clathrate hydrate, and the results showed that the structural transition from semi-to cubic structure II hydrate can occur in the presence of methane gas. C-13 solid-state NMR and Raman spectroscopy were used to confirm the distribution of guest molecules. Finally, we measured the phase equilibrium conditions of a binary (TMA + CH4) clathrate hydrate. The guest-induced structural transformation in amine semi-clathrate hydrates can provide useful insight into the complex nature of the host guest inclusion system, and these results can be applied to research on potential gas storage and transportation areas.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-04
Language
English
Article Type
Article
Keywords

HYDROGEN STORAGE; SELF-PRESERVATION; MOLECULAR-HYDROGEN; CH4 ENCLATHRATION; GUEST MOLECULES; GAS HYDRATE; CLATHRATE; IDENTIFICATION; EQUILIBRIUM; SEPARATION

Citation

FLUID PHASE EQUILIBRIA, v.413, pp.123 - 128

ISSN
0378-3812
DOI
10.1016/j.fluid.2015.11.032
URI
http://hdl.handle.net/10203/208314
Appears in Collection
CBE-Journal Papers(저널논문)
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