Increased Selectivity in CO2/CH4 Separation with Mixed-Matrix Membranes of Polysulfone and Mixed-MOFs MIL-101(Cr) and ZIF-8

Combination of two hydrothermally stable MOFs MIL‐101(Cr) and ZIF‐8 in a 1:1 ratio in a polysulfone (PSF) mixed‐matrix membrane (MMM) showed a significant higher selectivity in mixed‐gas CO2/CH4 permeation tests for 16 wt.‐% MIL‐101(Cr)/ZIF‐8 compared to analogous single‐filler MMMs [MIL‐101(Cr) or...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2016-09, Vol.2016 (27), p.4363-4367
Main Authors: Tanh Jeazet, Harold B., Sorribas, Sara, Román-Marín, José M., Zornoza, Beatriz, Téllez, Carlos, Coronas, Joaquín, Janiak, Christoph
Format: Article
Language:English
Subjects:
Carbon dioxide
Gas separation
Metal-organic frameworks
Methane
Microporous materials
Mixed-matrix membranes
Polysulfones
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Summary:Combination of two hydrothermally stable MOFs MIL‐101(Cr) and ZIF‐8 in a 1:1 ratio in a polysulfone (PSF) mixed‐matrix membrane (MMM) showed a significant higher selectivity in mixed‐gas CO2/CH4 permeation tests for 16 wt.‐% MIL‐101(Cr)/ZIF‐8 compared to analogous single‐filler MMMs [MIL‐101(Cr) or ZIF‐8] or to the also tested combination NH2‐MIL‐53(Al)/ZIF‐8 (1:1 ratio). The CO2/CH4 selectivity increased significantly from 23 to 40 from pure PSF to the 16 wt.‐% MIL‐101(Cr)/ZIF‐8 membrane. Separation of CO2/CH4 is relevant for purification (“sweetening”) of natural gas (CH4 as main component) which is soured with up to over 40 % CO2 and N2 and only useable at low CO2 concentrations. Combination of two different MOFs [MIL‐101(Cr) and ZIF‐8] in the same MMM produces synergy effects with significant increase of CO2/CH4 selectivity compared to analogous MMMs with only one filler type.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201600190