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- W2131950504 abstract "Sequestration of CO 2 in hydrate form within deep oceanic sediments, to simultaneously replace methane trapped in submarine hydrate, has been considered as an efficient method for CO 2 reduction. Consequently, research efforts are underway to deeply understand the properties of CH 4 and CO 2 hydrates. In this work, CH 4 + CO 2 double hydrate crystals were grown from aqueous solution in a capillary high-pressure optical cell. The quantitative relationships between Raman intensity and dissolved gas (i.e., CH 4 and CO 2 ) concentration in water and in hydrate were established. The partition coefficients of CH 4 and CO 2 between the hydrate and aqueous phases were measured at 5 constant temperatures from 275.15 to 293.15 K. The equilibrium concentrations of dissolved CH 4 and CO 2 decrease with decreasing temperatures, indicating more dissolved CH 4 and CO 2 will be transferred from the aqueous to the hydrate phase at lower temperature. With decreasing temperature, the molality of CO 2 in hydrate increases and the molality of CH 4 in 5 12 6 2 cavities decreases, while the sum of the molality of CH 4 in 5 12 6 2 cavities and molality of CO 2 in hydrate keeps constant, indicating that CO 2 molecules can replace more methane molecules under lower temperature only by occupying the 5 12 6 2 cavities." @default.
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- W2131950504 date "2015-09-01" @default.
- W2131950504 modified "2023-09-25" @default.
- W2131950504 title "In situ Raman spectroscopic observation of the temperature-dependent partition of CH4 and CO2 during the growth of double hydrate from aqueous solution" @default.
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- W2131950504 doi "https://doi.org/10.1139/cjc-2014-0550" @default.
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