Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 125, Issue 1-2, Pages 30-34Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2009.02.014
Keywords
2D NMR; Inverse Laplace transformation; Fourier transformation; Diffusion; Exchange; NaX
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Funding
- IRTG
- Max-Buchner-Foundation
- German Science Foundation DFG [GA 1291/1-2, KA 953/16-1]
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The diffusional behavior of selected hydrocarbons adsorbed in NaX zeolites were investigated with pulsed magnetic field gradient (PFC) NMR methods in two different ways. First, the exchange time tau(exch) of n-pentane between the interior and the exterior of the zeolite crystals was determined by two-dimensional diffusion exchange spectroscopy. The results were compared to the mean life time tau(intra) as obtained by fast NMR tracer desorption method. Second, the diffusion of a propylene-propane mixture adsorbed in the zeolite was studied by Fourier transform PFG NMR, thus employing the chemical shift of the individual organic constituents as a second dimension for a selective evaluation of the PFG NMR signal decays and the subsequent extraction of corresponding diffusion coefficients. Modifications of NMR pulse sequences necessary for the application of ultra-high pulsed magnetic field gradients of up to +/-35 T m(-1) in microporous materials are briefly discussed for both kind of experiments. (C) 2009 Elsevier Inc. All rights reserved.
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