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scope of this study, but just to mention that the cycle time will increase with increasing the desorption temperature, and hence, the productivity obtained will be lower. The same is expected for extreme pressurization and/or evacuation conditions. Convenient procedures for CO2 adsorption could be processes in which the adsorption step takes place at moderate pressures above atmospheric conditions, where expensive compression units are not required, and desorption is performed also under moderate vacuum conditions or a small heating of the system.118,119 These hybrid processes are called VPSA, PTSA and VTSA, according to the combine techniques, and are even more attractive for their commercial implementation because of the low energy demand. Recently, some researchers have studied the use these hybrid processes to improve the CO2 capture.45,116,120,121 A detailed study of the energy consumption of these hybrid processes has been also performed for the materials investigated in this work. Figure 9 shows a comparison of contour maps of specific energy quality consumption for VTSA processes, as a function of the desorption conditions Tregen (in the x-axe) and Pregen (in the y-axe). VPSA and PTSA processes are not included in the main body of the manuscript because they achieve lower purities and recoveries than those required for CCS specification and higher specific energy consumptions. Results including parameters such as specific energy requirements, working capacity, purity and recovery of these hybrid cycles can be found in Figures S25-S27 of the Supplementary Material. The exergetic parameters of CuBTC, Mg-MOF-74 and 13X are compared without impurity content and for three different conditions with impurities in VTSA processes; the impurities content where chosen from Figure 8 in the range showing lower specific energy consumption presented in section 3.3.1, but maintaining a 45PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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