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reasonable purity and working capacity. According to this, the evaluated conditions were: 0.1% H2O and 0.1% SO2 in CuBTC, 0.1% H2O and 0.1% SO2 in Mg-MOF-74, and 0.01% H2O and 0.01% SO2 in zeolite 13X. As expected, higher working capacities and higher specific energy consumptions are achieved for operating conditions presenting a large cyclic capacity,117 however, as mentioned before, a tradeoff must be achieved between these two parameters. Hence, highlighted squares in each contour map depict the hot spot regions where high working capacities can be obtained, purities and recoveries above 80-90%, and without incurring in extremely high energetic requirements. It is also interesting to note the change in shape of the contour maps when impurities are considered. Moreover, the minimum obtained in most cases improves the binary performance by increasing the purity and recovery achieved. Specific energy (i.e., exergy) consumption close to 1 GJ/tonne-CO2 that maximizes working capacities and purities in all three structures were found. For CuBTC, a proposed condition is to desorb at 0.15bar, 343K, and with 0.1% SO2. With a working capacity of 0.38 kmol/m3, specific energy consumption of 1.21 GJ/tonne-CO2, 81% purity and 92% recovery, this condition enhances the working capacity by 40%, and purity in more than 30%, with an increase in only 15% on the energy required, compared to the same conditions in the binary mixture. For Mg-MOF-74, an attractive point is to desorb at 0.2bar and 423K, obtaining a working capacity of 3.5kmol/m3, specific energy consumption of 0.36 GJ/tonne-CO2, 98% purity and 86% recovery for binary mixture. 46PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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