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Crystals 2019, 9(1), 20; https://doi.org/10.3390/cryst9010020

Modulating and Orienting an Anisotropic Zn-Based Metal Organic Framework for Selective CH4/CO2 Gas Separation

Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22904-4741, USA
These authors contributed equally to this work.
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Received: 13 November 2018 / Revised: 25 December 2018 / Accepted: 26 December 2018 / Published: 29 December 2018
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Abstract

This work investigates the morphological control of the anisotropic [Zn2(NDC)2(DABCO)]n MOF (Metal organic framework) and the subsequent adsorption characteristics for CO2/CH4 gas separation. Morphology of the MOF crystals is controlled by the use of modulators. The addition of acetic acid or pyridine successfully produce rod or plate morphologies, respectively, with each morphology possessing a different major surface pore aperture. Single-component equilibrium and kinetic adsorption data for CO2 and CH4 were collected. Equilibrium analysis indicates a slight selectivity towards CO2 whereas kinetic data unexpectedly shows lower diffusion time constants for CO2 compared to CH4. Mass transfer resistances on each species is discussed. Finally, a coating technique termed solution shearing is used to orient different morphologies on substrates as a film. An increase in film orientation is observed for the rod morphology, indicating that this MOF morphology is a promising candidate to create large area, thin-film applications. View Full-Text
Keywords: MOFs; gas separation; anisotropic MOFs; modulation; oriented crystals; solution shearing MOFs; gas separation; anisotropic MOFs; modulation; oriented crystals; solution shearing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Huelsenbeck, L.; Westendorff, K.S.; Gu, Y.; Marino, S.; Jung, S.; Epling, W.S.; Giri, G. Modulating and Orienting an Anisotropic Zn-Based Metal Organic Framework for Selective CH4/CO2 Gas Separation. Crystals 2019, 9, 20.

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