Accelerated Diffusion of Long-Chain Alkanes between Nanosized Cavities

An anomalous transport effect has been found by neutron spin echo measurements on n‐alkanes diffusing in a small‐pore zeolite: the diffusivity decreases from C1 to C8, but rises for C10 and has a maximum at C12, then decreases again. This confirms the existence of the “window effect” proposed thirty...

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Veröffentlicht in:	Angewandte Chemie International Edition 2004-01, Vol.43 (3), p.364-366
Hauptverfasser:	Jobic, Hervé, Méthivier, Alain, Ehlers, Georg, Farago, Bela, Haeussler, Wolfgang
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Sprache:	eng
Schlagworte:	alkanes Catalysis Chemical Sciences diffusion neutron scattering zeolites
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creator	Jobic, Hervé Méthivier, Alain Ehlers, Georg Farago, Bela Haeussler, Wolfgang
description	An anomalous transport effect has been found by neutron spin echo measurements on n‐alkanes diffusing in a small‐pore zeolite: the diffusivity decreases from C1 to C8, but rises for C10 and has a maximum at C12, then decreases again. This confirms the existence of the “window effect” proposed thirty years ago by Gorring. The picture shows schematically how one end of a C12 chain extends through a zeolite window, lowering the barrier to diffusion.
doi_str_mv	10.1002/anie.200352691
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subjects	alkanes Catalysis Chemical Sciences diffusion neutron scattering zeolites
title	Accelerated Diffusion of Long-Chain Alkanes between Nanosized Cavities
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