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In order to develop efficient adsorption processes, an appropriate adsorbent 7,8 should satisfy the following conditions: (1) high CO2 adsorption capacity, (2) high CO2 selectivity, (3) low heat capacity, (4) low-cost raw materials, (5) fast kinetics and (6) thermal, chemical, and mechanical stabilities under extensive cycling and impurities. A variety of solid adsorbents have been proposed to take into account structures and compositions, adsorption mechanisms and regeneration. Traditionally, both zeolites and activated carbons have been used for gas adsorption and separation. For instance, zeolite 13X provides high CO2 adsorption capacity at room temperature although high energy requirements can be needed for the regeneration of the absorbent.9 Metal-Organic Frameworks (MOFs) have been one of the fastest growing fields in chemistry and materials science during the past decades, with the number of publications growing exponentially.10 MOFs present a vast structural and chemical diversity, allowing potential applications in gas storage, ion exchange, molecular separation and heterogeneous catalysis,11,12,13,14 as well as promising alternatives adsorbents for carbon dioxide capture application.15,16,17 The adsorption capacity of MOF materials at higher pressures is much greater than that observed in benchmark zeolite 13X. Several authors18,19,20 have reported MOFs with high CO2 adsorption capacity. Among them, CuBTC or HKUST-1 [Cu3(BTC)2(H2O)3, (BTC: benzene-1,3,5-tricarboxylate)], first reported by Chui et al., 21 is one of the most studied MOFs for gas adsorption and storage. The reported CO2 adsorption capacities are in the range between 8.0 mol/kg and 10.2 mol/kg at 298K and 15bar.18,22 Differences are due to slightly different structural properties depending on the synthesis method.23 An interesting contending, especially at lower pressures, is the so-called Mg-MOF-74.24 This MOF currently displays one of the best adsorption performances for many gas molecules, with CO2 uptakes as high as 8.1 mol/kg at 298 K and 1.0 bar. Such a high performance for 5PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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