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Figure Captions Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Unit cell, including cation sites, for faujasite zeolites. N2 adsorption isotherms, measured at 25 C, for (a) Ag-LSX-450 (vacuum dehydrated at 450oC), (b) Ag-LSX-350 (vacuum dehydrated at 350oC), (c) Ag-X, and (d) Ag-Y. Amount of N2 adsorbed at 25 C and 1 atm versus dehydration time for Ag- LSX. All samples were vacuum dehydrated at 500 C. N2 adsorption isotherms, measured at 25 C, for Ag-LSX (a) after drying at room temperature followed by vacuum dehydration at 450 C, (b) after drying at room temperature followed by vacuum dehydration at 350 C, (c) after drying in air at 100 C followed by vacuum dehydration at 350 C and (d) after drying in air at 100 C in air followed by heat treatment in air at 450 C and finally vacuum dehydration at 450 C. N2 adsorption isotherms, measured at 25 C, for Ag-X (a) after drying at room temperature followed by vacuum dehydration at 450 C, and (b) after drying in air at 100 C followed by vacuum dehydration at 350 C. X-ray photoemission spectroscopy (XPS) spectra for Ag-LSX. The spectra were collected after (a) no thermal treatment, (b) heating at 200 C in vacuum and (c) heating at 450 C in vacuum. Sodalite and hexagonal prism site I and II cation locations in Ag-faujasites. Configuration (a) shows the normal cation locations with occupied sites at SI, SI′ and SII. Configuration (b) shows cation sites which have resulted from cation and/or cluster migration upon vacuum thermal treatment. This configuration shows occupied sites at SI′*, SII′ and SII*. Heat of adsorption (kcal/mol) versus surface coverage (molec/uc) for N2 adsorption on (a) Ag-LSX-450 and (b) Li-LSX-450. 39PDF Image | PSA USING SUPERIOR ADSORBENTS
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