Influence of confinement in mesoporous silica on diffusion of a mixture of carbon dioxide and an imidazolium-based ionic liquid by high field diffusion NMR.

Journal article
(Original article)


Publication Details

Author(s): Hazelbaker ED, Guillet-Nicolas R, Thommes M, Kleitz F, Vasenkov S
Journal: Microporous and Mesoporous Materials
Publisher: Elsevier Inc.
Publication year: 2015
Volume: 206
Pages range: 177-183-183
ISSN: 1387-1811


Abstract

Proton and carbon-13 pulsed field gradient (PFG) NMR was applied to study diffusion of the mixt. of carbon dioxide and the ionic liq. 1-n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide under condition of confinement in the mesopores of KIT-6 silica. The results of these diffusion studies were compared with the results obtained for the corresponding bulk mixt. and pure ionic liq. (IL) as well as for the confined pure IL. It was obsd. that the confinement in mesopores, which were fully loaded with the IL, reduces the cation diffusivity by around a factor of two in comparison to that in the corresponding bulk CO2/IL mixt. or the pure IL. This result was obtained for short diffusion times when possible transport resistances at the external surface of KIT-6 particles are not expected to change the intraparticle diffusivity of the cations. The large exptl. uncertainty of the measurements of carbon dioxide diffusivity in the confined CO2/IL mixt. at the smallest diffusion time prevented making a definitive conclusion about the influence of the confinement on CO2 diffusivity. The reported exptl. data suggest that the CO2 diffusivity under the conditions of confinement can be comparable to or even larger than that in the bulk CO2/IL mixt. For larger diffusion times, both the carbon dioxide and cation diffusivities in the confined mixt. were found to decrease with increasing diffusion time. This diffusion time dependence was attributed to the influence of transport resistances at the external surface of KIT-6 particles. [on SciFinder(R)]


Additional Organisation
Lehrstuhl für Thermische Verfahrenstechnik


External institutions with authors

Quantachrome Instruments
Université Laval (UL)
University of Florida


How to cite

APA:
Hazelbaker, E.D., Guillet-Nicolas, R., Thommes, M., Kleitz, F., & Vasenkov, S. (2015). Influence of confinement in mesoporous silica on diffusion of a mixture of carbon dioxide and an imidazolium-based ionic liquid by high field diffusion NMR. Microporous and Mesoporous Materials, 206, 177-183-183. https://dx.doi.org/10.1016/j.micromeso.2014.12.005

MLA:
Hazelbaker, Eric D., et al. "Influence of confinement in mesoporous silica on diffusion of a mixture of carbon dioxide and an imidazolium-based ionic liquid by high field diffusion NMR." Microporous and Mesoporous Materials 206 (2015): 177-183-183.

BibTeX: 

Last updated on 2019-21-02 at 08:53