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It is worth mentioning that, while Mg-MOF-74 and zeolite 13X show high uptakes for VSA, the amount of CO2 remaining in the adsorption bed at regenerating conditions is also high (e.g., at 0.1bar, the remained amount of CO2 in both structures is 3.7 and 2.9 kmol/m3 respectively). Note also that desorption pressures below 0.10 bar are achievable in experiments,112 while vacuum above 0.2-0.3bar can imply net values of working capacities of almost zero for Mg-MOF-74 and zeolite 13X (see Figure S19 in the Supplementary Material). Moreover, working capacities in MOFs almost doubled the zeolite 13X behavior in all cases when the feeding pressure at adsorption conditions is raised from 10 to 20bar. For instance, CuBTC and Mg-MOF-74 present working capacities values in the binary mixture of 4.7 and 4.1 kmol/m3, respectively (operating between 20→1 bar), compared to 1.7 kmol/m3 for zeolite 13X. Moreover, Mg-MOF-74 offers the best results in PSA processes with impurities content, demonstrating that this material can be appropriate for this type of separation in spite of presenting slightly higher isosteric heats. In some singular cases, see for instance, PSA 10→1bar with 0.1% SO2 in CuBTC, and VSA 1→0.1bar with 0.01% H2O in zeolite 13X, the working capacity value obtained is higher than the one from the binary mixtures. This is mainly due to a larger reduction in nitrogen than carbon dioxide adsorption capacity for competition with impurities. CO2 purity at the outlet of the adsorber is another important variable to consider, depending on the conditions required for its storage or different applications and the investment associated to it. Figures 6 and 7 show CO2 purity (%) as a function of the recovery achieved (%). Each color line corresponds to a swing adsorption process 34PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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