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strongly than at other sites within the intracrystalline volume. The heat of adsorption becomes horizontal with adsorption of approximately one N2 molecule per cavity. A comparison with the same plot of the isosteric heat of adsorption for N2 on for Li94.5Na1.5- LSX, which is essentially horizontal, shows that the energetic heterogeneity of the Li94.2Ag1.1Na0.7-LSX zeolite is due entirely to the incorporation of the approximately one Ag per unit cell. The approximately constant heat of adsorption with increasing coverage for the Li94.5Na1.5-LSX is consistent with previously reported results (Bajusz and Goodwin, 1997), and likely indicates an energetically homogeneous surface. Structural Effects on Adsorption The adsorbate-zeolite interactions correspond to those between the adsorbing gas and the surface oxygen and charge compensating cations. In faujasite zeolites, the cations in the beta-cages and the double 6-ring (hexagonal prism) are sterically inaccessible to nitrogen; and so only the supercage (SII, SII*, and SIII) cations interact with the gases of interest in air separation (N2, O2, and Ar). However, the electric field around these supercage cations is partially shielded by the surrounding oxygen atoms. Because of this shielding, the electrostatic and induction interactions are expected to be lower than that of an isolated ion. Further, dispersion forces acting on the molecule will be higher since adsorbate molecules also interact with oxygen atoms of the zeolite. From the analysis of the structural data and the resulting effects on the adsorption of nitrogen for the near-fully Ag+-exchanged LSX (Hutson et al., 2000), one can make inferences of what are the similar effects for mixed Li,Ag-LSX. We mentioned earlier that lithium cations located in SII locations do not interact with atmospheric gases because of the short distance, and resulting shielding, to the framework oxygen. Silver 101PDF Image | PSA USING SUPERIOR ADSORBENTS
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