Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D 1H NMR relaxometry
Abstract
Molecular mobility and exchange of adsorbed fluid in porous media of silicalite-1 were studied by two-dimensional nuclear magnetic resonance (NMR) techniques in fully and partly saturated samples. Three porous volumes were determined in silicalite-1 where n-hexane and water molecules are adsorbed: intracrystallite channels, mesopores and intercrystallite space. The molecular exchange between all porous volumes was observed and typical exchange times were estimated for n-hexane and water. Using the exchange times the self-diffusion coefficients were estimated as D ~ 1.11×10−10 for n-hexane and D ~ 6.67×10−11 m2/s for water in fully saturated silicalite-1 and found in a good agreement with literature data.
Keywords
Supporting agencies: This work was supported by the Russian Foundation for Basic Research (Project No. 16-32-00169 mol_a). All NMR measurements were carried out on the equipment of the Federal Centre of Shared Facilities at Kazan Federal University.
About the Authors
B. I. Gizatullin
Kazan Federal University; Ilmenau Technical University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008; Unterpoerlitzer 38, Ilmenau 98693, Germany
A. V. Savinkov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
T. V. Shipunov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
D. L. Melnikova
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
M. M. Doroginitzky
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
V. D. Skirda
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
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Review
For citations:
Gizatullin B.I., Savinkov A.V., Shipunov T.V., Melnikova D.L., Doroginitzky M.M., Skirda V.D. Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D 1H NMR relaxometry. Magnetic Resonance in Solids. 2018;20(1):18102 (9 pp.).
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