We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Clathrate hydrate equilibrium modeling: Do self-consistent cell models provide unique equilibrium solutions?
- Authors
Lafond, Patrick G.; Grim, R. Gary; Sum, Amadeu K.
- Abstract
When clathrate hydrates of xenon gas are formed deep within the stability field, anomalous melting behavior is readily observed in differential scanning calorimetry (DSC). In the DSC thermograms, multiple dissociation events may be observed, suggesting the presence of more than one solid phase. Following a suite of diffraction and NMR measurements, we are only able to detect the presence of simple structure I hydrate. Recognizing that hydrates are nonstoichiometric compounds, we look back to how the molar composition of a hydrate phase is determined. Making a mean-field improvement to current equilibrium models, we find that some conditions yield multiple solutions to the cage filling of the hydrate phase. Though the solutions are not truly stable, they would result in a kinetically trapped system. If such a case existed experimentally, this could explain the dissociation behavior observed for xenon hydrates. More importantly, this raises the question of how well defined the equilibrium condition is for a cell potential model, and whether or not multiple equilibrium solutions could exist.
- Subjects
GAS hydrates; XENON; EQUILIBRIUM reactions; SELF-consistent field theory; DIFFERENTIAL scanning calorimetry
- Publication
Canadian Journal of Chemistry, 2015, Vol 93, Issue 8, p826
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2014-0558