Journal
CHEMICAL ENGINEERING JOURNAL
Volume 359, Issue -, Pages 775-778Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.11.170
Keywords
c-C4F8; Clathrate hydrates; Gas separation; F-gas; Structure H
Categories
Funding
- Mid-career Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017R1A2B4005455]
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [NRF-2015R1A5A7037825]
- National Research Foundation of Korea [2017R1A2B4005455] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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No gaseous guests have ever been discovered that can form sH clathrate hydrates. Herein, we show that a large molecular fluorinated gas (octafluorocyclobutane, c-C4F8), can stabilize the crystal structure of sH clathrate hydrate by occupying large (5(12)6(8)) cages. The inclusion of c-C4F8 molecules in sH clathrate hydrate in the presence of CH4 molecules was clearly demonstrated through three-phase (clathrate hydrate (H)-liquid water (LW) -vapor (V)) equilibria, powder X-ray diffraction (PXRD) and C-13 NMR spectroscopy. The discovery of a gaseous sH former, c-C4F8, contributes to broadening clathrate hydrate science and engineering by expanding target components for sH clathrate hydrates, and also offers excellent potential in various applications of sH clathrate hydrates, especially in clathrate hydrate-based gas separation.
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