期刊
CHEMPHYSCHEM
卷 16, 期 13, 页码 2876-2881出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500339
关键词
butanol; hydrates; phase equilibria; Raman spectroscopy; X-ray diffraction
资金
- National Research Foundation Korea (NRF) - Korean government (MEST) [2010-0029176]
- WCU program [31-2008-000-10055-0]
- Ministry of Education and Science Technology
- Ministry of Knowledge Economy through the project Recovery of Natural Gas Hydrate in Deep-Sea Sediments Using Carbon Dioxide and Nitrogen Injection [KIGAM-Gas Hydrate RD Organization]
- Nuclear R&D program - Ministry of Science, ICT, and Future Planning [NRF-2015M2B2A4029581]
- National Research Foundation of Korea [2015M2B2A4029581, 2010-0029176] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, we investigate the crystal structures and phase equilibria of butanols+CH4+H2O systems to reveal the hydroxy group positioning and its effects on hydrate stability. Four clathrate hydrates formed by structural butanol isomers are identified with powder X-ray diffraction (PXRD). In addition, Raman spectroscopy is used to analyze the guest distributions and inclusion behaviors of large alcohol molecules in these hydrate systems. The existence of a free OH indicates that guest molecules can be captured in the large cages of structure II hydrates without any hydrogen-bonding interactions between the hydroxy group of the guests and the water-host framework. However, Raman spectra of the binary (1-butanol+CH4) hydrate do not show the free OH signal, indicating that there could be possible hydrogen-bonding interactions between the guests and hosts. We also measure the four-phase equilibrium conditions of the butanols+CH4+H2O systems.
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