| 초록 |
CH4 hydrates are crystalline compounds that form at high pressure and low temperature and have a large potential of future clean energy resources. In addition, CH4 hydrates show self-preservation effect, which means that CH4 hydrates are not fully dissociated below a thermodynamic equilibrium line and 273.15 K. Recently, it was reported that the presence of MMT can affect cage occupancy of CH4 hydrate. However, the dissociation behavior of CH4 hydrate in presence of MMT has not been well studied. In this study, the effect of Na-saturated MMT on the thermodynamic equilibria of CH4 hydrate was measured. The cage occupancy of CH4 hydrates with different MMT concentrations were analyzed using 13C NMR. In addition, the hydrate dissociation behaviors of self-preservation guest (CH4) and non-self-preservation guest (CHF3) in the presence of MMT were observed by collecting temperature-dependent powder X-ray diffraction (PXRD) patterns. The results demonstrated that Na-MMT does not affect three-phase equilibria of CH4 hydrates, but can contribute to retarding the dissociation of CH4 hydrates below 273.15 K. |
