Methane adsorption on porous nano-silica in the presence of water: An experimental and ab initio study

Journal of Colloid and Interface Science
Lu Wang, Qingchun Yu

Abstract

This study investigated the effects of silanol groups and water content on methane adsorption on hydrophilic nano-silica H-380 through experiments and ab initio calculations. Fourier transform infrared (FTIR) spectroscopy was used to confirm the presence of silanol groups on the solid surface, and the pore size distribution between 0 and 40nm was determined using CO2 and N2 sorption experiments. Ab initio MP2 and complete basis set model (CBS-4) calculations were performed to optimize four different silica surfaces with and without silanol groups using different basis sets. The theoretical calculations and experiments indicated that the adsorption of methane slightly decreased when the water content was low. As the water content increased from 29.03wt% to 40.54wt%, the confined water molecules (water within the pores) promoted the adsorption of CH4 by forming deeper adsorption potential energy wells, thus rendering the system more stable. The experimental isotherms at 308.15-318.15K were obtained over a wide range of water contents up to 75.05wt%. The experimental data are consistent with the theoretical analysis, indicating an increase in the adsorption of CH4 as the water content increased from 39.75wt% to 50.35wt%. Additiona...Continue Reading

References

Mar 1, 1985·Physical Review. B, Condensed Matter·K Toukan, A Rahman
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Tina DürenRandall Q Snurr
Jul 22, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·R P MaratheM P Srinivasan
Dec 31, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Pierre BillemontGuy De Weireld
Jan 26, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Pierre BillemontGuy De Weireld

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Citations

Jun 28, 2016·Advances in Colloid and Interface Science·V M Gun'koJ P Blitz

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