Mapping the evolution of adsorption of water in nanoporous silica by in situ solid-state 1H NMR spectroscopy

Journal of the American Chemical Society
Mingcan XuJohn Meurig Thomas

Abstract

A recently developed technique for carrying out in situ solid-state NMR studies of adsorption processes in nanoporous materials is applied to map the evolution of the adsorption of water on the widely used siliceous nanoporous host material MCM-41. The technique allows the very earliest stages of the adsorption process to be probed, and using solid-state 1H NMR, the time resolution is of the order of a few hundred seconds. This work reveals that different water environments are populated at different stages of the adsorption process and reveals insights regarding both the sequence in which these different environments become populated and the exchange of water molecules between these environments. The results also provide access to information on the kinetics of the adsorption process, revealing an initial regime of rapid water adsorption up to ca. 1 wt % water, followed by a regime of slower water adsorption. In both regimes, the amount of water adsorbed increases linearly with time. As demonstrated by these results, the approach employed in this work creates new opportunities for investigating, in unprecedented detail, adsorption processes in nanoporous materials.

References

Mar 18, 2004·Journal of the American Chemical Society·Jeong-Myeong HaMichael D Ward
May 24, 2007·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Mingcan XuDavid E W Vaughan

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Citations

Sep 9, 2011·Journal of the American Chemical Society·Nicolas FollietThierry Azaïs
Jan 13, 2018·Annual Review of Analytical Chemistry·Sharon E AshbrookKaren E Johnston
Nov 13, 2015·Chemistry : a European Journal·Angiolina ComottiPiero Sozzani
Dec 3, 2016·Physical Chemistry Chemical Physics : PCCP·Mounesha Nagendrachar GaragaAnna Martinelli
Jul 10, 2008·The Journal of Physical Chemistry. a·Colan E Hughes, Kenneth D M Harris
Jun 17, 2021·Chemistry : a European Journal·Chia-Hsin ChenDanielle Laurencin

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