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Adv Funct Mater. 2016 May 10;26(18):3154-3163. doi: 10.1002/adfm.201505352.

Metal Organic Framework Crystals in Mixed-Matrix Membranes: Impact of the Filler Morphology on the Gas Separation Performance.

Author information

1
Catalysis Engineering-Chemical Engineering Department, Delft University of Technology, Julianalaan, 136, 2628 BL Delft, The Netherlands.
2
Heterogene Reaktionen, Max-Planck-Institut für Chemische Engergiekonversion, Stifstrasse 34 - 36, D-45470 Mülheim an der Ruhr, Germany.
3
Chemical and Environmental Engineering Department and Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain.
4
Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen Basse-Normandie, CNRS, 6 Boulevard Maréchal Juin, 14050 Caen, France.

Abstract

Mixed-matrix membranes (MMMs) comprising NH2-MIL-53(Al) and Matrimid® or 6FDA-DAM have been investigated. The MOF loading has been varied between 5 and 20 wt%, while NH2-MIL-53(Al) with three different morphologies: nanoparticles, nanorods and microneedles have been dispersed in Matrimid®. The synthesized membranes have been tested in the separation of CO2 from CH4 in an equimolar mixture. At 3 bar and 298 K for 8 wt% MOF loading, incorporation of NH2-MIL-53(Al) nanoparticles leads to the largest improvement compared to nanorods and microneedles. The incorporation of the best performing filler, i.e. NH2-MIL-53(Al) nanoparticles, to the highly permeable 6FDA-DAM has a larger effect, and the CO2 permeability increased up to 85 % with slightly lower selectivities for 20 wt% MOF loading. Specifically, these membranes have a permeability of 660 Barrer with CO2/CH4 separation factor of 28, leading to a performance very close to the Robeson limit of 2008. Furthermore, a new non-destructive technique based on Raman spectroscopy mapping is introduced to assess the homogeneity of the filler dispersion in the polymer matrix. The MOF contribution can be calculated by modelling the spectra. The determined homogeneity of the MOF filler distribution in the polymer is confirmed by FIB-SEM analysis.

KEYWORDS:

Metal-organic frameworks; NH2-MIL 53(Al); gas separation; mixed-matrix membranes; natural gas and biogas upgrading

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