title: Monitoring molecular mass transfer in cation-free nanoporous host crystals of type AlPO-LTA.
abstract: Micro-imaging is employed to monitor the evolution of intra-crystalline guest profiles during molecular adsorption and desorption in cation-free zeolites AlPO-LTA. The measurements are shown to provide direct evidence on the rate of intra-crystalline diffusion and surface permeation and their inter-relation. Complemented by PFG NMR and integral IR measurements, a comprehensive overview of the diffusivities of light hydrocarbons in this important type of host materials is provided.
authors.affiliation: Department of Interface Physics, University of Leipzig, Linnéstraße 5, 04103 Leipzig, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Hibbe
authors.forename: Jürgen
authors.initials: J
authors.lastname: Caro
authors.forename: Christian
authors.initials: C
authors.lastname: Chmelik
authors.forename: Aisheng
authors.initials: A
authors.lastname: Huang
authors.forename: Tom
authors.initials: T
authors.lastname: Kirchner
authors.forename: Douglas
authors.initials: D
authors.lastname: Ruthven
authors.forename: Rustem
authors.initials: R
authors.lastname: Valiullin
authors.forename: Jörg
authors.initials: J
authors.lastname: Kärger