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<p>This study reports the characterization of clathrate hydrates formed in argon (Ar) + cyclopentane (CP) + water (H<sub>2</sub>O) system and Ar + CP + heavy water (D<sub>2</sub>O) system via the experimental phase equilibrium determination and the powder X-ray diffraction (PXRD) measurements. Four-phase (Ar gas + liquid CP + liquid H<sub>2</sub>O or liquid D<sub>2</sub>O + hydrate) equilibrium conditions were measured with the isochoric procedure in the pressure range from 0.38&#xa0;MPa to 4.80&#xa0;MPa. The corresponding temperature ranges were from 282.6&#xa0;K to 294.6&#xa0;K for H<sub>2</sub>O system and from 285.4&#xa0;K to 296.8&#xa0;K for D<sub>2</sub>O system. The equilibrium temperature of Ar + CP + D<sub>2</sub>O system is consistently higher by 2.2&#xa0;K to 2.8&#xa0;K than that of Ar + CP + H<sub>2</sub>O system. The detailed crystallographic properties of both H<sub>2</sub>O-based Ar + CP hydrate and D<sub>2</sub>O-based Ar + CP hydrate including the crystalline structure, lattice constants, and cage occupancies were estimated by the PXRD analysis. The cage occupancy of Ar in the small cages was lower in the Ar + CP hydrate formed at 0.7&#xa0;MPa compared to the hydrate formed at 2.0&#xa0;MPa. Based on the obtained results, implications for hydrate-based technologies are discussed, including seawater desalination, refrigeration systems, and tritiated water separation.</p>

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Thermodynamic Stability and Characterization of Binary-Guest Clathrate Hydrates Formed in Argon + Cyclopentane + H2O or D2O Systems

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Meku Maruyama,
  • Satoshi Takeya,
  • Riku Matsuura,
  • Ryo Ohmura

摘要

This study reports the characterization of clathrate hydrates formed in argon (Ar) + cyclopentane (CP) + water (H2O) system and Ar + CP + heavy water (D2O) system via the experimental phase equilibrium determination and the powder X-ray diffraction (PXRD) measurements. Four-phase (Ar gas + liquid CP + liquid H2O or liquid D2O + hydrate) equilibrium conditions were measured with the isochoric procedure in the pressure range from 0.38 MPa to 4.80 MPa. The corresponding temperature ranges were from 282.6 K to 294.6 K for H2O system and from 285.4 K to 296.8 K for D2O system. The equilibrium temperature of Ar + CP + D2O system is consistently higher by 2.2 K to 2.8 K than that of Ar + CP + H2O system. The detailed crystallographic properties of both H2O-based Ar + CP hydrate and D2O-based Ar + CP hydrate including the crystalline structure, lattice constants, and cage occupancies were estimated by the PXRD analysis. The cage occupancy of Ar in the small cages was lower in the Ar + CP hydrate formed at 0.7 MPa compared to the hydrate formed at 2.0 MPa. Based on the obtained results, implications for hydrate-based technologies are discussed, including seawater desalination, refrigeration systems, and tritiated water separation.