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Figure 3 shows N2, O2 and Ar adsorption isotherms for Ag95.7Na0.3-X-1.0, 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. 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 3, 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;24 and, in our work, the Ag-zeolites which had been dehydrated in vacuo at 350 C also showed a selectivity for Ar over O2. However, the Ag-zeolites which had been dehydrated in vacuo at 450 C had approximately the same adsorption capacity for Ar and O2 (as shown in Figure 3). This is probably due to increased interaction between the charged Ag-clusters and the quadrupole moment of the O2 molecule (whereas, the Ar has no quadrupole moment). Adsorption Isotherms for Mixed Cation (LixAgy) Zeolites. The N2 adsorption isotherms, measured at 25 C, for LixAgy-X-1.0 zeolites after vacuum dehydration at 450 C for a minimum of 4 hours are shown in Figure 4 (where the amount adsorbed is given in mmol/g) and Figure 5 (where the amount adsorbed is given in molec/uc). These zeolites contained varying amounts of Ag per unit cell ranging from zero (i.e., the near 57PDF Image | PSA USING SUPERIOR ADSORBENTS
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