Tracing pore-space heterogeneities in X-type zeolites by diffusion studies |
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Authors: | Adem Ziad Caro Jürgen Furtado Filipe Galvosas Petrik Krause Cordula B Kärger Jörg |
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Institution: | Department of Interface Physics, University of Leipzig, Linne?strasse 5, 04103 Leipzig, Germany. |
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Abstract: | Pore-space homogeneity of zeolite NaX was probed by pulsed field gradient (PFG) NMR diffusion studies with n-butane as a guest molecule. At a loading of 0.75 molecules per supercage, a wide spectrum of diffusivities was observed. Guest molecules in the (well-shaped) zeolite crystallites were thus found to experience pore spaces of quite different properties. After loading enhancement to 3 molecules per supercage, however, molecular propagation ideally followed the laws of normal diffusion in homogeneous media. At sufficiently high guest concentrations, sample heterogeneity was thus found to be of no perceptible influence on the guest mobilities anymore. |
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