Abstract
The physicochemical properties of protic ionic liquids (IL)–zeolite (Z) composites were investigated. H-3 methylimidazolium bis(trifluoromethanesulfonyl) imide (TFSI)/NaY zeolite composites with different IL/Z weight ratios were prepared and characterized. X-ray diffraction and FT-Raman measurements show the formation of NaTFSI during the preparation procedure which indicates that an ion exchange reaction is taking place during the composite preparation method. N 2 physisorption shows that the zeolite pores are completely filled when IL/Z ratio is between 0.2 and 0.5. The water adsorption capacity of the samples decreased with IL/Z ratio. The conductivity of the composite pellets increased with temperature and ionic liquid loading, however significant enhancement was detected once the IL/Z weight ratio was higher than a threshold value (∼0.5). Moreover, theoretical calculations were performed using the Effective Medium Theory in order to understand the effect of IL/Z ratio on conductivity. In qualitative agreement with the experimental data, the model shows a sharp increase of the conductivity right above a critical threshold value for the ionic liquid/zeolite mass ratio, followed by a more moderate increase at higher loadings.
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