Abstract
Mixed matrix membranes (MMMs) containing three different metal organic frameworks (MOFs) (Cu3BTC2, FeBTC and MIL-53 (Al)) as filler in P84 were prepared and characterized in terms of ethylene/ethane separating ability. SEM, TGA and DSC suggest the absence of non-selective voids in the Cu3BTC2 and FeBTC MMMs. Gas permeation experiments confirmed this, and showed an increase in ethylene/ethane selectivity of 73% to a value of 7.1, while ethylene permeability remained constant at 17×10−18molm/(m2sPa) with addition of 20wt% Cu3BTC2. Addition of 20wt% FeBTC showed a reduced permeability, caused by the formation of a denser intermediate layer, and no significant change in selectivity. Addition of MIL-53 led to increased permeabilities and no change in selectivity, which is probably the result of the formation of non-selective voids or the absence of inherent selectivity of MIL-53.
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