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| - Dissociation Condition Measurements of Methane Hydrate in Confined Small Pores ofPorous Glass
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| - The dissociation conditions of methane hydrates in confined small pores were measured by the gradualtemperature increase method. Significant downward shifts of the dissociation temperature were observed inporous glasses, which had small pores ranging from 100 to 500 Å in diameter, compared with that of thebulk hydrate at a given pressure. Systematic measurements revealed that the temperature offset was in inverseproportion to the pore diameter. The Arrhenius plot of the dissociation conditions suggests that the heat ofmethane-hydrate dissociation tended to be small compared to that of bulk hydrates in pores smaller than 300Å in diameter. Applying the Gibbs−Thomson effect to the quantitative analysis of the phenomenon indicatedthat the dissociation condition of methane hydrates in small pores shifted because of changes in the wateractivity. The apparent interfacial free energy between methane hydrates and water in the confined conditionwas estimated to be approximately 3.9 × 10-2 J m-2, which is comparable to that between ice and water inthe similar condition.
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