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Seo, Yongwon
Advanced Clean Energy Lab (ACE Lab)
Research Interests
  • Gas Hydrate, Greenhouse Gas, Clean Energy

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2-Propanol As a Co-Guest of Structure II Hydrates in the Presence of Help Gases

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Title
2-Propanol As a Co-Guest of Structure II Hydrates in the Presence of Help Gases
Author
Lee, YoungjunLee, SeungminPark, SungwonKim, YunjuLee, Jong-WonSeo, Yongwon
Keywords
2-propanol; Analytical method; Chemical formulae; Hydrate inhibitors; NMR spectrum; Powder X-ray diffraction (pXRD); Stoichiometric concentration
Issue Date
201302
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.117, no.8, pp.2449 - 2455
Abstract
The enclathration of 2-propanol (2-PrOH) as a co-guest of structure II (sII) hydrates in the presence of CH4 and CO2 was experimentally verified with a focus on macroscopic phase behaviors and microscopic analytical methods such as powder X-ray diffraction (PXRD) and NMR spectroscopy. 2-PrOH functioned as a hydrate promoter in the CH4 + 2-PrOH systems, whereas it functioned as an apparent hydrate inhibitor in the CO2 + 2-PrOH systems despite the inclusion of 2-PrOH in the hydrate lattices. From the PXRD patterns, both double CH4 + 2-PrOH and double CO2 + 2-PrOH hydrates were identified to be cubic (Fd3m) sII hydrates. From the C-13 NMR spectra, it was found that, at a lower 2-PrOH concentration, the small 5(12) cages of the sII hydrate were occupied by CH4 molecules only, whereas the large 5(12)6(4) cages were shared by CH4 and 2-PrOH molecules. However, at a stoichiometric concentration, the large cages were occupied by 2-PrOH molecules only, and the corresponding chemical formula for this concentration is 1.50CH(4).0.98 2-PrOH.17H(2)O.
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DOI
http://dx.doi.org/10.1021/jp310487w
ISSN
1520-6106
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