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different capacity at a given partial pressure, but also different patterns of variation in adsorbent capacities with partial pressure, which in turn affects their selectivities. Figure 2.2. CO2 adsorption isotherms for MOFs, activated carbon zeolites and silicalite at 25°C (Lee, 2007; Gholami and Talaie, 2009; Shao et al., 2011; Herm et al., 2012; Xiang et al., 2012) Adsorption systems can be less expensive in some aspects compared to absorption systems. Solid adsorbents seldom need replacement as compared to the liquid solvents used in amine absorption systems, which decreases the operating cost. However, a PSA- based process requires complex valve operation and large compressor operation costs. In this aspect, TSA-based processes are favored because large pressure swings are not needed for their operation, which reduces system complexity and compressor power requirements (Moore, 2012). Despite these advantages, however, PSA-based systems have thus far been considered more energy efficient than their TSA counterparts, mainly due to the difficulty in heating adsorbent packed in a bed form (Moate and LeVan, 2010; 17PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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