| 초록 |
Natural Gas Hydrates have promising potential as a possible new clean energy source and appropriate materials for sequestering CO2. Research has been recently conducted on the injection of flue gas to sequester CO2 without separating stage, and to exploit a new energy source effectively. Although these natural gas hydrates predominantly exist as sI and sII in nature, it was verified that sH hydrates also naturally occur. In this study, 2,2-dimethylbutane was added as a sH hydrate former to confirm its effect on the three-phase (H-Lw-V) equilibria of CO2 + N2 + water system. To verify the structural transition, the gas hydrate samples were analyzed via Raman spectroscopy and X-ray diffractometry (XRD). The dissociation enthalpies of these systems were also measured using a differential scanning calorimeter (DSC) to confirm the formation of sH hydrate and the co-existence of sI and sH hydrates. From the thermodynamic and microscopic analyses, it was verified that CO2 functions as a co-guest of sH hydrate in the N2-enriched system, and structural transition of sH to sI occurs in the CO2 + N2 + 2,2-dimethylbutane + Water System. |
