| 초록 |
We introduced cyclobutanemethanol (CBM) as hydrate former for the first time and confirmed formation of structure II (sII) hydrate in the presence of methane(CH4) gas using spectroscopic tools, such as 13C solid-state nuclear magnetic resonance(NMR) and powder x-ray diffraction(PXRD). In NMR spectra, it was identified that CBM molecules were captured in the large cages of sII hydrate, and CH4 molecules were captured in the large and small cages of sII hydrate, respectively. The crystal structure of a binary (CBM + CH4) hydrate was refined with Rietveld analysis, indicating that the formation of sII hydrate with a lattice parameter of 17.23630 Å. In order to check potential application of gas storage using the binary (CBM + CH4) hydrate, thermodynamic stability of the binary (CBM + CH4) hydrate was measured. Phase equilibrium conditions of the binary (CBM + CH4) hydrate was more stable than those of pure CH4 hydrate. Finally, the gas storage capacity of the binary (CBM + CH4) hydrate was investigated, and showed superiority compared to (tetrahydrofuran + CH4) hydrate and (cyclopentane + CH4) hydrate. |
