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Stability of methane hydrate at high-pressure and high-temperature of up to 40 GPa and 573 K

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, , Citation Hirokazu Kadobayashi et al 2020 J. Phys.: Conf. Ser. 1609 012007 DOI 10.1088/1742-6596/1609/1/012007

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KADOBAYASHI.Hirokazu@nims.go.jp

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1 National Institute for Materials Science, Tsukuba, Ibaraki, Japan

2 Geodynamics Research Center, Ehime University, Matsuyama, Ehime, Japan

3 Department of Environment Systems, Rissho University, Kumagaya, Saitama, Japan

4 National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan

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1742-6596/1609/1/012007

Abstract

High-pressure and high-temperature experiments were performed to investigate the stability of methane hydrate under 6–40 GPa and 298–573 K using synchrotron X-ray powder diffraction in combination with a diamond anvil cell. The results thus obtained revealed that methane hydrate decomposes into solid methane and ice VII at temperatures considerably lower than the melting curves of solid methane and ice VII in the pressure range of 6–40 GPa.

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10.1088/1742-6596/1609/1/012007