NMR Studies of Single-File Diffusion in Unidimensional Channel Zeolites
Single-file diffusion is the restricted propagation of particles that cannot pass each other. The occurrence of this phenomenon should be reflected by a change in the time dependence of the mean particle displacement in comparison with ordinary diffusion. Although this process is considered to be the rate-controlling mechanism in a large variety of processes, so far no direct evidence of this phenomenon has been provided. Diffusion measurements made with pulsed field gradient nuclear magnetic resonance (NMR) in unidimensional pore systems (zeolites AlPO4-5 and Theta-1) reflect the expected time dependence of single-file diffusion.
Kukla
V
V. Kukla, H. Pfeifer, J. Karger, Universitat Leipzig, Fakultat fur Physik und Geowissenschaften, Linnestrasse 5, D-04103 Leipzig, Germany. J. Kornatowski, RWTH (Technical University), Institut fur Technische Chemie und Heterogene Katalyse, Worringerweg 1, D-52074 Aachen, Germany, and Faculty of Chemistry, N. Copernicus University, Gagarina 7, 87-100 Torun, Poland. D. Demuth, S. Schunk, K. K. Unger, Johannes Gutenberg Universitat Mainz, Institut fur Anorganische Chemie und Analytische Chemie, J.-J.-Becherweg 24, D-55029 Mainz, Germany. I. Girnus, Institut fur Angewandte Chemie, Rudower Chaussee 5, D-12489 Berlin, Germany. L. V. C. Rees, Department of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, UK.
Kornatowski
J
Demuth
D
Girnus
I
Pfeifer
H
Rees
LVC
Schunk
S
Unger
KK
Karger
J