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Adsorption and Diffusion – Basis for Molecular Understanding of Permeation through Molecular Sieve Membranes
Author(s) -
Chmelik Christian,
Voß Hartwig,
Bux Helge,
Caro Jürgen
Publication year - 2011
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201000179
Subject(s) - selectivity , membrane , molecular sieve , adsorption , chemistry , permeation , knudsen diffusion , zeolitic imidazolate framework , diffusion , chemical engineering , gas separation , sorption , desorption , methane , metal organic framework , organic chemistry , catalysis , thermodynamics , biochemistry , physics , engineering
In three case studies, (i) 1‐butene/ i ‐butene separation on a ZSM‐5 membrane, (ii) carbon dioxide/methane, and (iii) ethene/ethane separations on a zeolitic imidazolate framework 8 (ZIF‐8) type metal organic framework (MOF) membrane, it is demonstrated that the membrane selectivity for the separation of a gas mixtures can be well described and even predicted by the interplay of mixture adsorption and mixture diffusion according to the simple relation membrane selectivity = adsorption selectivity × diffusion selectivity . The mixed gas adsorption and diffusion data which are necessary for the above calculation can be derived cost and time effective by sorption uptake/desorption studies on giant single crystals with IR microscopy (IRM) detection.