Macroscopic Evidence of Enhanced Formation of Methane Nanohydrates in Hydrophobic Nanospaces

DOI Web Site 被引用文献5件
  • J. Miyawaki
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan
  • T. Kanda
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan
  • T. Suzuki
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan
  • T. Okui
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan
  • Y. Maeda
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan
  • K. Kaneko
    Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan, and Frontier Technology Research Institute, Tokyo Gas Co., 1-7-7 Suehiro, Tsurumi, Yokohama, 230, Japan

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The methane adsorption of water-preadsorbed carbons of different micropore widths w at 303 K was measured. Although the amount of adsorption of supercritical methane on microporous carbon at 303 K was less than 9.4 mg g-1 at 101 kPa, the presence of the preadsorbed water enhanced noticeably the methane adsorption at 303 K even under subatmospheric pressure. The adsorption increment of methane reached a maximum at 1−2 h after introduction of methane and decreased gradually to a steady value after 20−50 h. The adsorption increment of methane depended on the fractional filling φw of micropores by the preadsorbed water. The maximum increment of 110 mg g-1 for w = 1.1 nm at a methane pressure of 2.6 kPa was obtained at φw = 0.34, corresponding to the estimated adsorption amount at 21 MPa of methane (130 mg g-1). The methane-adsorption increment increased linearly with φw until φw = 0.35, indicating the formation of the stable methane−water clathrate of which the composition of methane to water is 1:2. Thus, th...

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