Structural transformation and tuning behavior induced by the propylamine concentration in hydrogen clathrate hydrates

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The structures and the guest-host distributions of iso-propylamine (i-PA) and n-propylamine (n-PA) hydrates with hydrogen as a secondary guest were identified by powder X-ray diffraction and Raman spectroscopic analysis. The structure of 11.1 mol% i-PA + H-2 hydrate was identified to be hexagonal (space group P6(3)/mmc) with a few unindexed diffraction peaks, while 5.6 mol% i-PA + H-2 hydrate had a cubic structure (space group Fd (3) over barm). Similarly, the structure of 13.3 mol% n-PA + H-2 hydrate was found to be monoclinic (space group P2(1)/n), while 5.6 mol% n-PA + H-2 hydrate had a cubic structure (space group Fd (3) over barm). The 'tuning' phenomenon, multiple occupancy of hydrogen in the large cage at the pressure and temperature regions outside of pure hydrogen hydrate stability, was observed in the i-PA + H-2 hydrate only when the amine concentration was lower than the stoichiometric value of structure II hydrate. The three-phase (H-Lw-V) equilibria for alkylamine + H-2 + water mixtures were also measured to investigate their thermodynamic stability.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2015-05
Language
English
Article Type
Article
Keywords

N-PROPYLAMINE; INFRARED-SPECTRA; FERMI RESONANCE; RAMAN-SPECTRA; STORAGE; SYSTEM; PHASE; COGUEST; WATER

Citation

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.17, no.3, pp.1949 - 1956

ISSN
1463-9076
DOI
10.1039/c4cp03972f
URI
http://hdl.handle.net/10203/194759
Appears in Collection
ME-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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