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tolerance of 5% of the target pressure (or 0.0066 atm, whichever is smaller) was used to determine equilibrium for each measurement point. X-ray photoemission spectra were obtained from thin wafers of the zeolites using a Perkin-Elmer PHI 5400 ESCA system with a Mg anode. Samples of several types of Co- materials were prepared for XPS analysis by forming into very thin wafers using a laboratory press. The wafers were then degassed in the XPS staging cell at 10-8 - 10-9 torr for two days at room temperature prior to analysis. A lack of surface charging was verified by measuring the binding energy of adventitious carbon. The generally accepted reference for the binding energy of C 1s photoelectrons is 285 ± 0.2 eV.30 Results and Discussion Chemical Analysis. The results of the chemical analyses are shown in Table 1. The results show that the Co-LSX contained 18 wt% Co. This translates to approximately 47 Co cations per unit cell or about 98% ion exchange (of the total capacity). The Co(fluomine)-LSX sample contained 16 wt% Co, which is approximately 50 Co cations per unit cell or 104% of the ion exchange capacity. The Co(Fluomine)-MCM-41 sample had a Co content of 5.9 wt%, which is approximately 7.6 Co cations per unit cell or 95% of the ion exchange capacity. The analyses of fluorine were used to determine the amount of Co(fluomine) in each of the samples since the chance for contamination from adventitious carbon is higher than that of the fluorine (and the carbon results were consistently in excess of what would be expected based on the fluorine analyses). Based on the F analysis, the Co(fluomine)-LSX sample contained 10 Co(fluomine) molecules per unit cell or approximately 2 molecules per zeolite cavity. The 161PDF Image | PSA USING SUPERIOR ADSORBENTS
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