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LSX material does show some degree of reversibility, though it is not fully reversible, and is not fully desorbed even at low pressures. The N2 adsorption isotherm was also measured for this Co(fluomine)-LSX material and is also shown in Figure 5. The reversibility and the continual increase with pressure of the isotherm are desirable characteristics for application, which give rise to a useful working capacity. The O2 adsorption and desorption isotherms were also measured for the Co(fluomine)- LSX material at 0 C and at 60 C. These, along with those measured at 25 C, are shown in Figure 6. All of these isotherms are quite different from those of the free Co(fluomine). The curves measured at 0 C have the highest capacity (0.167 mmol/g at 1atm) of these materials and have a similar aspect to those of the Co(fluomine)-LSX measured at 25 C. The isotherms measured at 60 C had very low capacity (0.038 mmol/g) and seemed to be more reversible than those measured at 0 C and 25 C. Adsorption on Co(fluomine)-MCM-41. The MCM-41 materials are aluminosilicates but, unlike many zeolites, do not possess a natural selectivity for nitrogen over oxygen. The MCM-41 used in these studies contained a Si/Al 5. The O2 and N2 adsorption and desorption isotherms, measured at 25 C, for Co(fluomine)-MCM- 41 are shown in Figure 7. These curves are quite different from those of the free Co(fluomine) with nearly complete reversibility and much lower capacity (0.107 mmol/g at 1 atm). As with the Co(fluomine), O2 was strongly bound at very low pressures and, as with the Co(fluomine)-LSX, did not immediately attain the full capacity; but rather maintained a positive slope through 1 atm. The positive slope, again, yields a sorbent working capacity and is useful for application. The theoretical capacity for this material is 0.49 mmol/g for a 1:1 (O2:Co2+) and 0.25 mmol/g for a 1:2 (O2:Co2+) adduct. These 165PDF Image | PSA USING SUPERIOR ADSORBENTS
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