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• W2899688328 abstract "Flat hybrid membranes composed of polyetherimide (PEI) as matrix and zeolitic imidazolate frameworks (ZIFs) as fillers at concentrations of 10 and 20 wt% were prepared. Apparent permeability coefficient and apparent diffusivity coefficient of gases (CO2 and N2) for these hybrid membranes (PZIFs) were determined by the “time-lag” method. The experimental conditions used were from 25 °C to 55 °C with pressures of 2, 3 and 5 bar. The PZIFs with fillers of ZIF-8 (PZ-Zn) and ZIF-67 (PZ-Co) showed apparent selectivities (αPa(CO2)/Pa(N2)) of 39.6 and 27.5, respectively, higher than the αPa(CO2)/Pa(N2) of the reference membrane PEI, while the membrane with filler of ZIF-Mix (PZ-Zn/Co) showed the lowest αPa(CO2)/Pa(N2) selectivity of 10.3 in the membrane series (under conditions of 25 °C and 2 bar). It is proposed that the selectivity of the membrane series can be attributed to two critical factors: the particle size/distribution ratio in the polymer base and sorption of CO2 at local sites of the bimetallic mixture. On the other hand, gas permeation studies (O2, CO2 and CH4, and CO2/CH4 and CO2/C2H4 mixtures), were carried out in the series of PZIFs membranes. Permeability data were obtained by an isostatic method based on a permeation cell connected in series to a gas chromatograph where the rate of permeated gases was analyzed until a stationary state was reached. The complementary characterization techniques were: scanning electron microscopy, thermogravimetric analysis, and powder X-ray diffraction, which support the existence of the amorphous/crystalline phases of the PZIFs." @default.
• W2899688328 created "2018-11-16" @default.
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• W2899688328 date "2019-04-01" @default.
• W2899688328 modified "2023-10-10" @default.
• W2899688328 title "Modification of polyetherimide membranes with ZIFs fillers for CO2 separation" @default.
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• W2899688328 doi "https://doi.org/10.1016/j.seppur.2018.11.033" @default.
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