Future Work and Perspectives of MOF-based CO2 capture

“The moisture stability of original MOFs, as well as those of filler materials, is known from the literature, but these types of properties of CuBTC, UTSA-16, and UiO-66-BTEC composites will be studied in detail in the future and the next report will be prepared. However, pretests have been performed by exposing the materials to water for 2 h and taking up PXRD after filtration and drying. The obtained results showed that CuBTC-A-15 is characterized by higher signal intensities compared to untreated CuBTC. Compared to the sample obtained before treatment with water, the appearance of small, new signals, which may be related to the onset of dissolution of the material, is noticed. However, the intensity of these signals in CuBTC-A-15 is lower than in untreated CuBTC, which may indicate that the aerosil additive increases the stability of the material. However, additional experiments are planned to fully demonstrate this. Based on preliminary tests, it can be concluded that UTSA-16-Mt-5 and UTSA-16 have a similar moisture resistance, while UiO-66-BTEC-BC-15 and UiO-66-BTEC are stable even after 2 h in water. It is clearly visible in their PXRD (Figure S7) pattern that fully coincides with the signals from the untreated MOF and MOF-composite.”

“The selectivity of original MOFs as well as those of filler materials is known from the literature and is high in respect to N2 and CH4, but these types of properties of CuBTC, UTSA-16, and UiO-66-BTEC composites will be studied in detail in the future. The properties of both MOFs and filler additives and their synergistic effect must be taken into account when assessing the selectivity of materials. High selectivity has been highlighted in the literature as one of the advantages of UTSA-16 and UiO-66-BTEC. Thus, it can be speculated that the composites of these MOFs will also have similar properties, as shown by studies using similar additives such as clays and GO. Moreover, studies by several authors on CuBTC composites with GO (including even with 5% GO additive) show that the selectivity (CO2/CH4, CO2/N2) of the obtained composite is significantly higher than that of the parent materials [52].”

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