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The increase in purity is not as substantial as the recovery for Mg-MOF-74 and zeolite 13X in the monotonically part of the curves. On the contrary, curves of CuBTC exhibit a more rounded shape and lower inflection points, as a consequence of its low CO2-over-N2 selectivity. To achieve CCS purity specifications for utilization, extreme desorption conditions would be needed for this material. It can also be seen that VSA and TSA processes allow obtaining higher CO2 purities than the PSA ones, because N2 and impurities working capacities in PSA conditions are much higher and affect the composition at the outlet of the adsorber. Surprisingly, impurities increase the curve inflection point, and the effect is more pronounced in mixtures with water than with SO2 or NO2, i.e., the higher the molecule affinity for all three materials and the difference with the isosteric heat of CO2, the higher the inflection point that can be obtained in purity/recovery curves. In this study, the maximum inflection point is obtained for TSA at a desorbing temperature of 443K in all three materials, and with impurities compositions in the mixture of 1% H2O for CuBTC, 0.5% H2O for Mg-MOF-74 and 0.02% H2O for zeolite 13X. For sulfur dioxide, the maximum point is achieved for mixtures including 1% SO2, 1% SO2, and 0.1% SO2 for CuBTC, Mg-MOF-74 and zeolite 13X, respectively, but around 10-15% lower values in recovery are obtained. Furthermore, since according to Figures 5 to 7, TSA allows recovering higher amounts of CO2 than the other two processes, with higher purities, this process emerges as the most convenient so far. Nevertheless, the energy requirements for regeneration must be taken into consideration, as will be discussed in the next section. 38PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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