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In addition, GJ/tonne-CO2 values obtained with NO2 as impurity show almost constant specific consumption energy within this concentration range. Even though MOFs are more appropriate than zeolite 13X for PSA systems due to a higher CO2 uptake, the obtained purity and recovery values are lower and the energy requirements are the highest of the three technologies evaluated. In this case, their values are basically constant over the entire concentration range since it does not depends on the working capacity of other species besides CO2, due to the “no purge” assumption. Nevertheless, impurity content above 1% in all three materials makes this technology competitive. The minimal energy consumption and the maxima productivity (understood in this context as working capacity) do not coincide, in general, in the same operating point. Instead, there exists a so-called frontier zone where local minimum and maximum can be obtained for these two parameters. Multiple swing adsorption devices can be coupled with slightly beneficial effect on the purity of the recovered product.114,115 However, this comes at the expense of recovery and an increase in power requirement (energy penalty). An analysis of these effects lies out of the scope of this study. 3.3.2. Combined swing adsorption cycles TSA is a particularly promising process for post-combustion CO2 capture, owing to difficulties with compressing or applying a vacuum to large volumes of flue gas streams.24,116,117 It is a very versatile process in terms of cycle design and ability to adapt to changes in feed gas conditions (recovery, purity, energy consumption). However, the longer time required for extreme heating/cooling (and therefore productivity) may limit its application for CO2 capture at large scale. Dynamic/kinetic performance is out of the 44PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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