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enhancement in the N2 adsorption capacity for Li94.5Na1.5-LSX over that of Li77.0Na9.0-X. The data are shown in both mmol of adsorbate per gram of sorbent (top) and molecule of adsorbate per unit cell of sorbent (bottom). Figure 6 shows N2, O2 and Ar adsorption isotherms for Ag95.7Na0.3-LSX, all measured at 25 C, after vacuum dehydration at 450 C for a minimum of 4 hours. These samples were all initially gray in color, but after vacuum dehydration turned to a deep golden yellow, indicating the formation of silver clusters (Sun and Seff, 1994). Figure 7 shows the enhancement in the N2 adsorption capacity for Ag95.7Na0.3-LSX over that of the Ag85.7Na0.3-X. As before, the data are shown in both mmol of adsorbate per gram of sorbent (top) and molecule of adsorbate per unit cell of sorbent (bottom). While the near-fully exchanged Ag-zeolites, like their Li-zeolite analogs, have very high N2 capacity and favorable N2:O2 selectivity, they are not favorable for use in adsorption-based separations. Because of the strong adsorption of N2 at low pressure, creating a low pressure “knee” in the adsorption isotherm shown in Figure 6, the working capacity (i.e., the Q, the change in the adsorptive capacity from the typically used adsorption pressure of 1.0 to a desorptive pressure of 0.33 atm) is very small; and the material must be exposed to very low pressure conditions in order to increase that working capacity. Some Ag-zeolites have been shown to have a selectivity for Ar over O2 (Knaebel and Kandybin, 1993); and, in this work, the Ag-zeolites that had been vacuum dehydrated at 350 C also showed a selectivity for Ar over O2. However, the Ag-zeolites that had been vacuum dehydrated at 450 C had approximately the same adsorption capacity for Ar and O2 (as shown in Figures 4 and 6). This is likely due to increased interaction 98PDF Image | PSA USING SUPERIOR ADSORBENTS
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