| 초록 |
In this research, Raman and 13C NMR spectroscopy are used to investigate the structure and distribution of guest molecules of substituted CH4 hydrates with N2+CO2 mixed gas and CH4+N2+CO2 mixed hydrates. All the structure of the hydrates in this work are revealed to be structure I hydrate from the NMR results. CH4, N2 and CO2 guest molecules are all identified in the substituted hydrate sample according to the Raman results. Therefore CH4 in the small and large cages of hydrates are replaced with N2 and CO2 gas respectively considering the size of guest molecules. From the 13C NMR results, the peaks which indicate CH4 in the small and large cavities independently have not a so great deviation. It means that similar amount of N2 and CO2 gas occupy the small and large cages of CH4 hydrates. Consequently, the flue gas consisting of mainly N2 and CO2 can be applied to recover CH4 gas from CH4 hydrate under the deep sea. |
