Replacement of methane hydrate by carbon dioxide: C-13 NMR study for studying a limit to the degree of substitution
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- Replacement of methane hydrate by carbon dioxide: C-13 NMR study for studying a limit to the degree of substitution
- Lee, H; Seo, Yongwon; Seo, YT; Kim, DY; Moudrakovski, IL; Ripmeester, JA
- OCEAN SEQUESTRATION; PHASE-EQUILIBRIA; CO2
- Issue Date
- Elsevier BV
- STUDIES IN SURFACE SCIENCE AND CATALYSIS, v.153, no., pp.495 - 500
- The results presented here show that, at least in a laboratory setting, the replacement of CH4 by CO2 is favored from the points of view of equilibrium thermodynamics. Pure and mixed-phase hydrates were prepared in porous silica gel in order to observe the guest distribution in hydrate cages by 13C NMR spectroscopy. The resulting ratio values for CH 4 in small and large cages strongly suggested that at least 64% of methane should be recoverable from a hydrate of composition CH 4·05H2O.
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