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Author

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

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Thermodynamic and 13C NMR spectroscopic verification of methane-carbon dioxide replacement in natural gas hydrates

Cited 3 times inthomson ciCited 3 times inthomson ci
Title
Thermodynamic and 13C NMR spectroscopic verification of methane-carbon dioxide replacement in natural gas hydrates
Author
Lee, SeungminPark, SungwonLee, YoungjunSeo, Yongwon
Keywords
Chemical formulae; Dual mechanisms; Hydrate phase; Mixed gas hydrates; NMR spectroscopic analysis; Replacement; Sequestration; Thermodynamic equilibria
Issue Date
201306
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v.225, no., pp.636 - 640
Abstract
The conversion of CH4 hydrate to CO2 hydrate with net recovery of CH4 is regarded as an attractive method of both CO2 sequestration and CH4 production. In this study, the CH4-CO2 swapping phenomenon occurring in gas hydrates and its potential application to CO2 sequestration was examined through thermodynamic equilibrium studies and a 13C NMR spectroscopic analysis. It was found that the CO2 composition in the hydrate phase and the expected recovery level for CH4 after swapping can be easily estimated from thermodynamic equilibrium studies linked to 13C NMR spectroscopic results. The experimental results showed that approximately 67% of CH4 is recoverable after replacement by CO2, which was also confirmed by direct dissociation. The corresponding chemical formula for the mixed gas hydrate after CO2 replacement is 5.03CO2.2.51CH4.46H2O. The results presented in this study further build the thermodynamic and physicochemical background required for understanding the simultaneously occurring dual mechanism of CO2 sequestration and CH4 recovery.
URI
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DOI
http://dx.doi.org/10.1016/j.cej.2013.03.117
ISSN
1385-8947
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