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2.5 2 1.5 1 0.5 0 CuBTC Mg-MOF-74 Zeo 13X 01234 Working Cap. (mol/kg) Figure 10. Specific energy consumption vs. CO2 recovered for selected swing adsorption processes showing the better performance in each material. VTSA processes shown as highlighted bubbles. For comparison, energetic performance range for amines are in the range between the dotted lines (marked in grey). In addition to 13X, the selected processes were compared with absorption processes based on the heat duty of the stripper: for the classical monoethanolamine (MEA) solvent,4,123 the exergetic requirement of the process is between 0.9–1.0 GJ/tonne-CO2. Value as low as 0.5 GJ/tonne-CO2 can be achieved by industrial pilot tests based on DMX process124, or with a mixture of amines as solvent.125 The minimal value obtained in this work is similar to these values, in the range of the one obtained by Chaffe et al.83 with VSA, but with higher purities and recoveries, and, in addition, significantly lower (almost 50%) than a reported 6-step TSA cycle117 and a PVSA110,114 based on zeolite. Adsorption processes are, however, close but not as mature as absorption processes yet for large scale CCS. Nevertheless, this study reinforces the 50 GJ/tonne-CO2PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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