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PSA USING SUPERIOR ADSORBENTS

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PSA USING SUPERIOR ADSORBENTS ( psa-using-superior-adsorbents )

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Table 1. Results of chemical analyses for some selected samples. Sample Co-LSX Co(flo)-LSX Co(flo)-MCM-41 Co C F wt% wt% wt% 18.0 - - 16.0 13.51 2.04 5.9 11.97 1.88 Table 2. Experimental O2 capacities (at 25 C, 1 atm) for various O2-binding materials compared to the theoretical capacities for 1:1 and 1:2 (O2:Co2+) adducts. Material Co(salen) Co(fluomine) Co(fluomine)-LSX Co(fluomine)-MCM-41 Co(fluomine)-IXR Experimental O2 capacity mmol/g 1.06 1.13 0.123 0.107 0.03 Theoretical 1:1 adduct mmol/g 3.1 2.78 0.57 0.49 1.23 Theoretical 1:2 adduct mmol/g 1.55 1.39 0.29 0.25 0.616 NOTE: The experimental capacity is that measured at 25 C and 1 atm, the Co(fluomine)-LSX result is corrected to account for the natural O2 capacity for Co-LSX. The theoretical amounts for the Co(fluomine)-LSX assume two Co(fluomine) molecules per zeolite cavity. The Co(fluomine)-MCM-41 theoretical amounts assume 3.7 Co(fluomine) molecules per unit cell. The Co(fluomine)-IXR theoretical amounts assume 100% Co2+ ion exchange and subsequent conversion to Co(fluomine). The cation exchange capacity for the LSX zeolite is 7.4 meq/g; the MCM-41 is 1.48 meq/g; and the ion-exchage resin is 4.7 meq/g. 175

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