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Influence of temperature and materials development for hierarchically porous MOF based CO2 capture

https://doi.org/10.3390/ma15155292

“In the hierarchically porous structures of CuBTC-Water, mesopores are beneficial to facilitating the mass diffusion/transfer processes, and micropores contribute to the high storage ability of gas molecules. To investigate the CO2 adsorption properties, static equilibrium adsorption was carried out. The adsorption–desorption isotherms measured at 273 K and 298 K for CuBTC-Water are displayed in Figure 3a,b. CuBTC-Water demonstrated a CO2 uptake of 180.529 cm3 g−1 at 273 K and 1 bar and 94.147 cm3 g−1 at 298 K and 1 bar, with selectivity for CO2/N2 mixtures (CO2/N2 = 15:85 v/v) as high as 56.547 at 273 K (Figure 3e, calculated using the IAST method), whereas microporous CuBTC-DMF only exhibited 144.681 cm3 g−1 at 273 K and 1 bar (Figure 3c) and 47.70 cm3 g−1 at 298 K and 1 bar (Figure 3d) with a selectivity of 34.692 for CO2/N2 mixtures (Figure 3f). Owing to the higher BET surface areas and pore volume (0.757 cm3 g−1 of CuBTC-Water (micropore volume of 0.668 cm3 g−1) and 0.509 cm3 g−1 of CuBTC-DMF (micropore volume of 0.498 cm3 g−1), the formed hierarchically porous CuBTC-Water presented a higher CO2 adsorption ability and selectivity toward N2 and H2 than microporous CuBTC-DMF under static equilibrium adsorption.”

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Figure 3. (a,b) Adsorption–desorption isotherms of CuBTC-Water at 273 K and 298 K. (c,d) Adsorption–desorption isotherms of CuBTC-DMF at 273 K and 298 K. (e,f) Selectivity of CuBTC-Water and CuBTC-DMF for CO2/N2 mixtures (CO2/N2 = 15:85 v/v, calculated using the IAST method) at 273 K and 298 K.”

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