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Received December 23, 2004
Accepted April 20, 2005
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Compositional and Structural Identification of Natural Gas Hydrates Collected at Site 1249 on Ocean Drilling Program Leg 204
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea 1Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Korea
h_lee@kaist.ac.kr
Korean Journal of Chemical Engineering, July 2005, 22(4), 569-572(4), 10.1007/BF02706645
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Abstract
In contrast to the structural studies of laboratory-grown gas hydrate, this study has been performed on naturally grown clathrate hydrates from the sea floor. The PXRD pattern of natural gas hydrate shows that the sample had a structure I hydrate. The 13C NMR spectrum was obtained for the natural gas hydrate sample in order to identify the cage occupancy of guest molecules and determine the hydration number. The NMR spectrum reveal that the natural gas hydrates used in this study contain only methane with no noticeable amount of other hydrocarbons. The existence of two peaks at different chemical shifts indicates that methane molecules are encapsulated in both large and small cages. In addition, Raman spectroscopic analysis is also carried out to identify natural hydrates and compared with the NMR results. Investigating the composition and structure of natural gas hydrates is essential for applying natural gas hydrates as a novel energy source.
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Gudmundsson JS, Parlaktuna M, Khokhar AA, "Storing Natural Gas as Frozen Hydrate", SPE Production and Facilities, February, 69 (1994)
Khokhar AA, Gudmundsson JS, Sloan ED, Fluid Phase Equilib., 150-151, 383 (1998)
Kirchner MT, Boese R, Billups WE, Norman LR, J. Am. Chem. Soc., 126(30), 9407 (2004)
Kvenvolden KA, Chem. Geol., 71, 41 (1988)
Makogon YF, “Natural Gas Hydrate: the State of Study in the USSR and Perspectives for Its Use,” the 3rd International Chemical Congress of North America, Toronto, Canada (1988)
Milkov AV, Sassen R, Mar. Pet. Geol., 19, 1 (2002)
Ripmeester JA, Ratcliffe CI, J. Phys. Chem., 92, 337 (1988)
Seo YT, Lee H, Korean J. Chem. Eng., 20(6), 1085 (2003)
Seo Y, Lee H, J. Phys. Chem. B, 106(37), 9668 (2002)
Sloan, Jr. E. D., Clathrate Hydrates of natural Gases, 2nd., Marcel Dekker, New York (1998)
Sum AK, Burruss RC, Sloan ED, J. Phys. Chem. B, 101(38), 7371 (1997)
