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Methane hydrate equilibria in silica gels with broad pore‐size distributions
Author(s) -
Smith Duane H.,
Wilder Joseph W.,
Seshadri Kal
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480222
Subject(s) - methane , hydrate , clathrate hydrate , dissociation (chemistry) , desorption , volume (thermodynamics) , radius , chemistry , thermodynamics , silica glass , mineralogy , materials science , adsorption , organic chemistry , composite material , physics , computer security , computer science
Abstract Equilibrium pressures for the dissociation of methane hydrates confined in silica gel pores of nominal radii 7.5, 5.0 and 3.0 nm were measured over a wide temperature range, and were observed to be higher than those for bulk methane hydrate. A model is presented that allows the pore radius involved in each equilibrium to be determined from these data, so that the model exactly reproduces the experimental equilibrium pressure. Based on this model, pore volume distributions were reconstructed and found to be in good agreement with those obtained from nitrogen desorption isotherms, indicating that hydrate formed nearly uniformly in the available pores.