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from the surrounding oxygen in the 6-ring. The Ag-X zeolite contains supercage Ag in the relatively lower shielded 4-ring SIII locations. These cations are responsible for the bulk of the adsorptive capacity of this zeolite. Since no SII cations move to the SII* positions upon heating, there is no corresponding increase in the adsorptive capacity with heating from 350 C to 450 C. The Ag-LSX-450 sample had a higher N2 adsorptive capacity than the Ag-LSX-350 sample. The po the N2 adsorption capacity is a result of an increase in the number of SII* cations. This increase in SII* cations is a result of thermally induced silver migration from SI′* to SII′ which, as a result of repulsion, forces migration of Ag in the SII position upward into the supercage in the SII* location. The presence of three types of supercage cations (at the SII, SII*, and SIII sites) results in an adsorpti rest of the intra-crystalline volume. This may be due to a mixed intra-crystalline cation population or to high energy cations positioned in sites with low shielding. The presence of energetic heterogeneity of a system can be determined by plotting the isosteric heat of adsorption versus the amount adsorbed. Energetic heterogeneity of the system will result in a decrease in the isosteric heat of adsorption as the amount adsorbed increases. For small uptakes, the isosteric heat may decrease rather strongly with the amount adsorbed. At intermediate uptakes, the slope of this plot will usually decrease and become nearly horizontal. The measurement of adsorption isotherms at different temperatures permits the calculation of the heat of adsorption as a function of surface coverage. The isosteric heat of adsorption can be calculated from a series of isotherms by application of the Clausius- Claperyron equation as follows: 29 pPDF Image | PSA USING SUPERIOR ADSORBENTS
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