Adsorption of Carbon Dioxide, Methane, and Their Mixtute by Montmorillonite in the Presence of Water
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Type
ArticleKAUST Department
Computational Transport Phenomena LabEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2016-01-16Online Publication Date
2016-01-16Print Publication Date
2016-05Permanent link to this record
http://hdl.handle.net/10754/593666
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Using grand canonical Monte Carlo (GCMC) simulations, we study the adsorption behavior of CH4, CO2, and their mixture at 298.15 K and pressures up to 50 bar in Na-, Cs-, and Ca-montmorillonite clays in the presence of water. Montmorillonite clays in the presence of preadsorbed water, preferentially adsorb CO2 over CH4 during both pure component and mixture adsorption. The atomistic model we have used, gives good agreement with available single-component experimental adsorption isotherms, for CH4 and CO2 molecules adsorbed onto montmorillonite clays in the presence of water. We observe the general trend that the presence of increasing preadsorbed water content in the clay interlayers, reduced adsorption amounts of pure CH4 and CO2 molecules. With a relatively large basal spacing (d= 30 Å), the favorability of adsorption of CO2 by montmorillonite at relatively low pressures and intermediate water contents has been demonstrated using simulations. GCMC simulation is also used to assess the effect of water on the adsorption of N2/CH4, H2 S/CH4, CO2/N2, and CO2/H2 S binary mixtures in Na-montmorillonite clay. The ideal adsorbed solution theory is shown to agree well with the observed adsorption capacities and selectivities of mixtures in Na-montmorillonite clay.Citation
Adsorption of Carbon Dioxide, Methane, and Their Mixtute by Montmorillonite in the Presence of Water 2016 Microporous and Mesoporous MaterialsPublisher
Elsevier BVAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S1387181116000202ae974a485f413a2113503eed53cd6c53
10.1016/j.micromeso.2016.01.010