Gas Uptake in Solvents Confined in Mesopores: Adsorption versus Enhanced Solubility

Three molecular mechanisms for gas uptake in a solvent confined in mesopores are identified. On the one hand, CO2 uptake is an adsorption-driven phenomenon that arises from the strong interaction between the gas molecules and the pore surface. On the other hand, H2 uptake is a confinement-induced en...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2013-07, Vol.4 (14), p.2274-2278
Main Authors: Ho, Linh Ngoc, Clauzier, Stéphanie, Schuurman, Yves, Farrusseng, David, Coasne, Benoit
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Environment and Society
Environmental Sciences
Surfaces, Interfaces, Porous Materials, and Catalysis
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Summary:Three molecular mechanisms for gas uptake in a solvent confined in mesopores are identified. On the one hand, CO2 uptake is an adsorption-driven phenomenon that arises from the strong interaction between the gas molecules and the pore surface. On the other hand, H2 uptake is a confinement-induced enhanced solubility in which solubility is favored in the regions of low solvent density formed by the layering of the solvent. In partially filled pores, adsorption at the gas/liquid solvent interface is a third mechanism that leads to large gas uptakes. This study, which sheds light on previously reported yet unclear oversolubility in pores, provides a guide to design hybrid porous catalysts consisting of a solvent confined in a porous solid.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz401143x