CO2 adsorption on carbon molecular sieves

Assessment of CO2 Adsorption Capacity on Activated Carbons by a Combination of Batch and Dynamic Tests

“…Hence, for the sake of completeness, in Figure 3A-3B, the CO 2 equilibrium pressure ( 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 From Figure 3 it can be observed that, for both the CO 2 initial pressures investigated, CO 2 257 adsorption rate is higher for AC60, as testified by the lowest time taken to reach the final 258 equilibrium adsorption capacity; on the other hand, differences between AC20 and AC40 are 259 very slight. In Table 2, the equilibrium times (t eq ), as derived from experiments reported in These results reflect the mesopore content of the AC samples, highest for AC60 and 267 comparable for AC40 and AC20, which is commonly believed to exert a significant influence on 268 CO 2 adsorption rate 13,32 . Moreover, the experimental results clearly demonstrate that in both the …”

“…The hydrogen-based fuel cells 2,3 , an immediate and effective CO 2 mitigation can be pursued by the 41 adoption of appropriate post combustion technologies. The use of porous solids for CO 2 capture 4 towards ultramicropores 13,26,[29][30][31] . In particular, Sun and co-workers 29 elucidated the main 66 functional dependencies by a dedicated statistical analysis applied to a large set of activated 67 carbons, in which the correlation degree between CO 2 adsorption capacity and textural properties 68 was determined.…”

“…The analysis of the pertinent literature showed that microporous carbon materials with 183 pores less than 1 nm are considered as the most suitable for CO 2 capture at ambient temperature 184 and pressure 13,26,30,39 . Hence, in order to deepen the investigation of smaller pore sizes and their …”

Carbon dioxide adsorption on nitrogen enriched carbon adsorbents: Experimental, kinetics, isothermal and thermodynamic studies

“…69 kJ/mol with increase in surface coverage from 0.2 mmol/g to 0.5 mmol/g respectively. Lateral interactions between the adsorbed CO 2 molecules could be another reason for increase in isosteric heat of adsorption [57]. Average value of isosteric heat of adsorption was calculated to be 53.9 kJ/mol.…”

Hydrothermal preparation of highly porous carbon spheres from hemp ( Cannabis sativa L.) stem hemicellulose for use in energy-related applications

“…This is probably because that CO 2 capacity at the relative pressure of 0.03 mainly depends on the volume of narrow micropores, while the capacity at a much lower pressure could be dominated by other factors. Some literatures (Wickramaratne and Jaroniec, 2013;Hao et al, 2013;Wahby et al, 2012) have reported that the CO 2 adsorption uptake at lower pressures purely relies on the fraction of fine micropores (<0.5 nm). We calculated the volume of narrow micropores less than 0.5 nm from CO 2 adsorption (in Table 3), and found that the values for HACS-2 and HACS-3 were really higher than HACS-4, once again strengthening the key role of micropores smaller than 0.5 nm.…”