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Anomaly in the Chain Length Dependence of n-Alkane Diffusion in ZIF-4 Metal-Organic Frameworks

Journal Article · · Molecules
 [1];  [2];  [3];  [3];  [4];  [3];  [2];  [4]
  1. Univ. Leipzig, Leipzig (Germany). Faculty of Physics and Earth Sciences; Nanoporous Materials Genome Center
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Chemical and Biological Engineering
  3. Friedrich-Alexander-Univ. Erlangen-Nürnberg, Erlangen (Germany). Erlangen Catalysis Resource Center
  4. Univ. Leipzig, Leipzig (Germany). Faculty of Physics and Earth Sciences
Molecular diffusion is commonly found to slow down with increasing molecular size. Deviations from this pattern occur in some host materials with pore sizes approaching the diameters of the guest molecules. A variety of theoretical models have been suggested to explain deviations from this pattern, but robust experimental data are scarcely available. Here in this paper, we present such data, obtained by monitoring the chain length dependence of the uptake of n-alkanes in the zeolitic imidazolate framework ZIF-4. A monotonic decrease in diffusivity from ethane to n-butane was observed, followed by an increase for n-pentane, and another decrease for n-hexane. This observation was confirmed by uptake measurements with n-butane/n-pentane mixtures, which yield faster uptake of n-pentane. Further evidence is provided by the observation of overshooting effects, i.e. by transient n-pentane concentrations exceeding the (eventually attained) equilibrium value. Accompanying grand canonical Monte Carlo simulations reveal, for the larger n-alkanes, significant differences between the adsorbed and gas phase molecular configurations, indicating strong confinement effects within ZIF-4, which, with increasing chain length, may be expected to give rise to configurational shifts facilitating molecular propagation at particular chain lengths.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States). Nanoporous Materials Genome Center
Sponsoring Organization:
Alexander von Humboldt Foundation; German Science Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0008688
OSTI ID:
1474411
Journal Information:
Molecules, Journal Name: Molecules Journal Issue: 3 Vol. 23; ISSN MOLEFW; ISSN 1420-3049
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

New insights into the breathing phenomenon in ZIF-4 journal January 2019
Diffusion processes in a poly-crystalline zeolitic material: A molecular dynamics study journal August 2018

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