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Seo, Yongwon
Advanced Clean Energy Lab (ACE Lab)
Research Interests
  • Gas Hydrates, Greenhouse Gas, Clean Energy

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Phase Equilibria and Thermodynamic Modeling of Ethane and Propane Hydrates in Porous Silica Gels

Cited 23 times inthomson ciCited 21 times inthomson ci
Title
Phase Equilibria and Thermodynamic Modeling of Ethane and Propane Hydrates in Porous Silica Gels
Author
Seo, YongwonLee, SeungminCha, InukLee, Ju DongLee, Huen
Keywords
Active surfaces; Deep ocean; Experimental data; Gas molecules; Geometrical constraints; Gibbs-Thomson; Hydrate stabilities; Interfacial tensions; Marine sediments; Natural gas storage; Porous silica; Pressure regions; Propane hydrate; Thermodynamic modeling
Issue Date
2009-04
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.113, no.16, pp.5487 - 5492
Abstract
In the present study, we examined the active role of porous silica gels when used as natural gas storage and transportation media. We adopted the dispersed water in silica gel pores to substantially enhance active surface for contacting and encaging gas molecules. We measured the three-phase hydrate (H)-water-rich liquid (Lw)-vapor (V) equilibria of C 2H6 and C3H8 hydrates in 6.0, 15.0, 30.0, and 100.0 nm silica gel pores to investigate the effect of geometrical constraints on gas hydrate phase equilibria. At specified temperatures, the hydrate stability region is shifted to a higher pressure region depending on pore size when compared with those of bulk hydrates. Through application of the Gibbs-Thomson relationship to the experimental data, we determined the values for the C2H6 hydrate-water and C3H8 hydrate-water interfacial tensions to be 39 ± 2 and 45 ± 1 mJ/m2, respectively. By using these values, the calculation values were in good agreement with the experimental ones. The overall results given in this study could also be quite useful in various fields, such as exploitation of natural gas hydrate in marine sediments and sequestration of carbon dioxide into the deep ocean.
URI
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DOI
10.1021/jp810453t
ISSN
1520-6106
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