The propagator representation of molecular transport in microporous crystallites
Abstract
NMR diffusion data may easily be represented by the propagator, that is, by the probability that after a time interval Δ a molecule, initially at position z = 0, will be found at position z. Such a propagator representation is used for visualizing the mean features of molecular diffusion in biporous systems as, e.g., a powder sample of zeolite crystallites. As an example, propagator representations for ethane in NaX and NaCaA zeolites in dependence on the temperature and on the crystallite radii are given. The observed diffusion characteristics are in satisfactory agreement with theoretical estimates of the influence of inter- and intracrystalline transport on the overall diffusion behavior.
- Publication:
-
Journal of Magnetic Resonance
- Pub Date:
- 1983
- DOI:
- 10.1016/0022-2364(83)90094-X
- Bibcode:
- 1983JMagR..51....1K