Thermodynamics of Carbon Dioxide Hydrate Formation in Media with Broad Pore-Size Distributions

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• 作者：Duane H. Smith ; Joseph W. Wilder ; and Kal Seshadri
• 刊名：Environmental Science & Technology
• 出版年：2002
• 出版时间：December 1, 2002
• 年：2002
• 卷：36
• 期：23
• 页码：5192 - 5198
• 全文大小：129K
• 年卷期：v.36,no.23(December 1, 2002)
• ISSN：1520-5851

文摘

Equilibrium pressures for the dissociation of carbondioxide hydrates confined in silica gel pores of nominalradii 7.5, 5.0, and 3.0 nm were measured over a widetemperature range and were observed to be higher thanthose for bulk carbon dioxide hydrate. Models that have beenpreviously reported in the literature are used to determinethe pore radius involved in each equilibrium associatedwith these data, exactly reproducing the experimentalequilibrium pressure. Based on these models, pore volumedistributions are reconstructed and compared to thoseobtained from nitrogen desorption isotherms. This comparisonindicates that in the nominal 7.5 nm pores the hydrateformed nearly uniformly in the available pores, while in thenominal 5.0 and 3.0 nm pores it did not.