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O2 capacity of the Co(fluomine)-LSX from the zeolite matrix. However the zeolitic contribution is estimated to be only 0.028 mmol/g. This estimate is based on the measured N2 and O2 capacities of fully exchanged Co2+-LSX zeolite. At 1 atm, the N2 capacity of the Co-LSX is approximately two times that for O2. Therefore, the O2 contribution of the zeolite in the Co(fluomine)-LSX can be expected to be approximately on-half that of the N2 capacity (which was measured at approximately 0.057 mmol/g). So, the O2-binding of the Co(fluomine) is approximately 0.123 mmol/g, which is much less than the theoretical amount for a 1:1 adduct and less than that expected for a 1:2 adduct. It is possible that, because of the isolation of the Co(fluomine) within the zeolite cavity, the complexes form 1:1 (O2:Co2+) adducts rather than the 1:2 ones observed with the free complex. However, the observed capacities tend to indicate the formation of 1:2 adducts. It is also possible that there is some amount of Co(fluomine) attached to the outside surface of the zeolite. We have also considered the possibility that the Co(fluomine) is not attached to the zeolite matrix at all. Others have suggested an ion-exchange reaction in which the Co2+ of the zeolite are exchanged for protons in the free crystal (in that case, salen).25 This results in a simple physical mixture of the two. In other work in our lab, we synthesized what was essentially a physical mixture of LXS zeolite and Co(fluomine). The resulting oxygen adsorption isotherm did not look like those shown in Figure 5. Rather, the isotherm had exactly the same aspect of the free Co(fluomine) material (shown in Figure 3); but the capacity was diluted. From the shape of the O2 isotherm, it appears that, unlike the free Co(fluomine), the Co(fluomine)-LSX has not attained the full capacity at 1 atm. The bound O2 on the Co(fluomine) could not be desorbed, even at low pressure. However, the Co(fluomine)- 164PDF Image | PSA USING SUPERIOR ADSORBENTS
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