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Co(fluomine)-MCM-41 sample contained approximately 3.7 Co(fluomine) molecules per unit cell. O2 Isotherms for Co(salen) and Co(fluomine). The O2 adsorption and desorption isotherms, measured at 25 C, for Co(salen) are shown in Figure 2. These isotherms display a very noticeable and interesting hysteresis. The adsorption isotherm shows that very little O2 is adsorbed until the O2 pressure reaches a “threshold” amount at approximately 0.2 atm. The adsorption isotherm then sharply rises to nearly the full O2- binding capacity of the complex. Very low pressure was then required to release the bound oxygen. The O2-binding capacity for the Co(salen) material was 1.06 mmol/g, approximately 70% of the theoretical value of 1.55 mmol/g based on a 1:2 (O2:Co2+) adduct. The O2 adsorption and desorption isotherms, measured at 25 C, for Co(fluomine) are shown in Figure 3. These curves are somewhat similar to those of the Co(salen), but do not have a similar hysteresis. The material strongly binds O2 at very low pressures, immediately adsorbing the full capacity at pressures < 0.1 atm. However, at 25 C, the O2 could not be desorbed even at very low O2 pressures. The O2-binding capacity for the Co(fluomine) material was 1.13 mmol/g, approximately 80% of the theoretical value of 1.39 mmol/g based on a 1:2 (O2 :Co2+) adduct. The O2 adsorption and desorption isotherms were also measured for the Co(fluomine) material at 0 C and at 60 C. These, along with those measured at 25 C, are shown in Figure 4. All of these isotherms are quite different. The curves measured at 0 C have a similar aspect to that measured at 25 C; but the capacity is considerably lower (0.48 mmol/g versus 1.13 mmol/g). The isotherms measured at 60 C, however, were quite 162PDF Image | PSA USING SUPERIOR ADSORBENTS
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