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Published on: December 2, 2011
Thermodynamics of binary gas adsorption in nanopores
Sujeet Dutta1, Ronan Lefort, Denis Morineau
1Institut de Physique de Rennes, University of Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes, France. sujeet.dutta@univ-rennes1.fr.
Abstract:
MCM-41 nanoporous silicas show a very high selectivity for monoalcohols over aprotic molecules during adsorption of a binary mixture in the gas phase. We present here an original use of gravimetric vapour sorption isotherms to characterize the role played by the alcohol hydrogen-bonding network in the adsorption process. Beyond simple selectivity, vapour sorption isotherms measured for various compositions help to completely unravel at the molecular level the step by step adsorption mechanism of the binary system in the nanoporous solid, from the first monolayers to the complete liquid condensation.
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