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Carbon dioxide capture using mixed matrix membranes with metal-organic frameworks supporting ionic liquids
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The aim of this thesis was the development of new mixed matrix membranes (MMMs) for carbon dioxide (CO2) capture from post-combustion flue gas streams.
The synthetized pristine MOF MIL-101(Cr) and new IL@MOF systems, produced by the incorporation of two ionic liquids in MIL-101(Cr), [PMIM][Br]@MIL-101(Cr) and [BMIM][Br]@MIL-101(Cr) were characterized. The textural properties and adsorption capacity for CO2 and N2 on these materials were also studied.
The adsorption equilibria of the pure gases N2 and CO2 on the mentioned materials were performed by using the gravimetric method in a range of pressures from 0 to 10 bar and at 30ºC. All materials adsorbed higher amounts of CO2 than N2, due to the CO2 higher affinity with the adsorbents.
The prepared MMMs are separated in three groups, Matrimid®5218/MIL-101(Cr), Matrimid®5218/[PMIM][Br]@MIL-101(Cr), Matrimid®5218/[BMIM][Br]@MIL-101(Cr). Each membrane group was prepared using a polymeric material Matrimid®5218 with different concentrations of filler (10%, 20% and 30% (w/w)).
All the prepared membranes were characterized by scanning electron microscopy (SEM), to evaluate their morphology; energy-dispersive x-ray spectroscopy (EDS), to observe the filler dispersion in the polymeric matrix; contact angles to determine their hydrophilicity; mechanical properties to evaluate their mechanical resistance and flexibility; thermogravimetric analysis (TGA) to evaluate their thermal stability and gas permeation experiments with pure gases (N2 and CO2) at 30ºC.
The obtained results showed that all membranes have a dense structure exhibiting a good interaction between the polymer, MOF and IL@MOF. It was also verified that with the addition of MOF the membranes turned more fragile, while with the addition of the ionic liquid in the MOF porous structure led to more flexible and resistant membranes. Additionally, it was found that the addition of MOF or IL@MOF in the polymeric matrix turn the membranes more hydrophilic. Thermogravimetric analysis (TGA) showed that all membranes are stable up to 300ºC. Gas permeation results showed that depending on the MOF or IL@MOF concentration on the polymer matrix an increase in CO2/N2 ideal selectivity is observed.
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Palavras-chave
CO2 capture Matrimid®5218 Metal-Organic Frameworks Ionic Liquids Mixed Matrix Membranes Adsorption