Metal Organic Framework Crystals in Mixed-Matrix Membranes

Impact of the Filler Morphology on the Gas Separation Performance

Journal article (2016)

Authors

A. Sabetghadam Esfahani

B. Seoane de la Cuesta

Marco Daturi CNRS

Joaquín Coronas Universidad de Zaragoza

F. Kapteijn

J. Gascon Sabate

D. Keskin

Nicole Duim

Tania Rodenas Max-Planck-Institut für Chemische Engergiekonversion

S. Shahid

Sara Sorribas Universidad de Zaragoza

Clément Le Guillouzer CNRS

Guillaume Clet CNRS

Carlos Téllez Universidad de Zaragoza

Metal-organic frameworks Gas separation Mixed-matrix membranes Natural gas and biogas upgrading NH-MIL-53(Al)

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Published Date

2016

Language

English

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Abstract

Mixed-matrix membranes comprising NH₂-MIL-53(Al) and Matrimid or 6FDA-DAM have been investigated. The metal organic framework (MOF) loading has been varied between 5 and 20 wt%, while NH₂-MIL-53(Al) with three different morphologies, nanoparticles, nanorods, and microneedles has 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, into the highly permeable 6FDA-DAM has a larger effect, and the CO₂ permeability increases up to 85% with slightly lower selectivities for 20 wt% MOF loading. Specifically, these membranes have a permeability of 660 Barrer with a 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 modeling the spectra. The determined homogeneity of the MOF filler distribution in the polymer is confirmed by focused ion beam scanning electron microscopy analysis.