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values assume 3.6 molecules of Co(fluomine) per unit cell of the MCM-41. The actual capacity of this material at 1 atm oxygen pressure and 25 C is less than the theoretical amount for both the 1:2 adduct and the 1:1 adduct. Although the pore structure of the MCM-41 is much more open than the LSX zeolite, it may not be possible for a Co(fluomine) molecule to attach at every ion-exchange site. And, much more oxygen may be bound at higher pressures (than 1 atm). The O2-binding of this material was much more reversible than either the Co(fluomine)-LSX or the neat Co(fluomine) complex. This may be an indication of the formation of 1:1 adducts since the free Co(fluomine) form 1:2 adducts and is very difficult to desorb. Adsorption on Co(fluomine)-IXR. The O2 and N2 adsorption and desorption isotherms, measured at 25 C, for Co(fluomine)-IXR are shown in Figure 8. These curves most closely resemble those of the Co(fluomine)-MCM-41 with nearly complete reversibility but with much lower capacity (0.03 mmol/g at 1 atm). As with all of other materials, O2 was strongly bound at very low pressures. But, as with all of the other immobilized samples, the sample did not immediately attain the full capacity; but rather has a positive slope through 1 atm. The N2 adsorption isotherm was also measured for this Co(fluomine)-IXR material and is shown in Figure 8. The theoretical capacity for this material is about 1.2 mmol/g for a 1:1 (O2:Co2+) and 0.6 mmol/g for a 1:2 (O2:Co2+) adduct. These values assume 100% ion-exchange of Co2+ with the ion-exchange resin (with a cation exchage capacity of 4.7 meq/g) and subsequent conversion to Co(fluomine). The actual capacity of this material, at 0.03 mmol/g at 25 C and 1 atm, is considerably lower than the theoretical amount. 166PDF Image | PSA USING SUPERIOR ADSORBENTS
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