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The diffusion of water in SAPO-34 was investigated experimentally in the temperature and loading range relevant for adsorptive heat transformation applications. Corrected diffusivities, which were determined by IR microscopy using adsorptive layers on aluminum supported SAPO-34 during adsorption and...

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Bibliographic Details
Published in:Chemie ingenieur technik 2016-03, Vol.88 (3), p.372-378
Main Authors: Stallmach, Frank, Splith, Tobias, Chmelik, Christian, Fueldner, Gerrit, Henninger, Stefan K, Kolokathis, Panagiotis T, Pantatosaki, Evangelia, Papadopoulos, George K
Format: Article
Language:English
Subjects:
Adsorptivity
Aluminum
Diffusion
Diffusion layers
Microscopy
Thermodynamic equilibrium
Transformations
Water
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Summary:The diffusion of water in SAPO-34 was investigated experimentally in the temperature and loading range relevant for adsorptive heat transformation applications. Corrected diffusivities, which were determined by IR microscopy using adsorptive layers on aluminum supported SAPO-34 during adsorption and desorption and self-diffusion coefficients derived from NMR diffusion studies in thermodynamic equilibrium are found to be consistent to each other. They are both independent of water loading and about two orders of magnitude smaller than the diffusivity of liquid water at the same temperature. The temperature dependence of the water diffusion may be well described by an activation energy of (11 plus or minus 2)kJmol super(-1).Original Abstract: Die Diffusion von Wasser in SAPO-34 wurde im Temperatur- und Beladungsbereich, der fuer Anwendungen in der adsorptiven Waermetransformation relevant ist, experimentell untersucht. Korrigierte Diffusionskoeffizienten aus IR-Messungen, die direkt an Adsorptionsschichten auf einem Aluminiumtraeger waehrend der Adsorption und Desorption gemessen wurden und Selbstdiffusionskoeffizienten aus NMR-Untersuchungen im thermodynamischen Gleichgewicht sind untereinander konsistent, weitgehend beladungsunabhaengig und etwa zwei Grosenordnungen kleiner als die Diffusion des fluessigen Wassers bei gleicher Temperatur. Die Temperaturabhaengigkeit der Wasserdiffusion im SAPO-34 kann mit einer Aktivierungsenergie von (11 plus or minus 2)kJmol super(-1) beschrieben werden.
ISSN:0009-286X
1522-2640
DOI:10.1002/cite.201500140