Transformation of $\gamma$-Ray-Formed Methyl Radicals in Methane Hydrate at 10 MPa
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概要
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The stability of methyl radicals formed in synthetic methane hydrate by $\gamma$-ray irradiation at 77 K was studied at 200–273 K and 10 MPa. The methyl radicals decayed under these conditions, despite the stability of methane hydrate, and changed into other molecules that could not be detected by electron spin resonance (ESR). Decay products were investigated by gas cell infrared (IR) spectroscopy by measuring the decomposed gas from the $\gamma$-irradiated methane hydrate. Only ethane molecules were detected from the irradiated sample, while these were absent in an unirradiated sample. The molar ratio of ethane to methane (C2H6/CH4) was $12\pm 1$ ppm, which did not contradict with that of methyl radical to methane (CH$_{3}{}^{\bullet}$/CH4) in the literature. Hence, most of the methyl radicals generated by irradiation were supposed to be transformed to ethane in methane hydrate.
- 2007-01-15
著者
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NAKASHIMA Satoru
Department of Biotechnology, University of Tokyo
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Tani Atsushi
Department Of Chemistry Graduate School Of Science Hiroshima University
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Otsuka Takahiro
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Ishikawa Kenji
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Otsuka Takahiro
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Nakashima Satoru
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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