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A series of N2 adsorption isotherms was measured for Ag95.7Na0.3-X-1.0 and Li73.8Na1.2Ag21-X-1.0 after partial or full dehydration in vacuum at various temperatures. The results for both zeolites showed a continual increase in the N2 adsorption capacity (at 1 atm) with increasing dehydration temperature up to 450 - 500 C. Materials which had been dehydrated in vacuum at 550 C and 600 C had N2 capacities which were considerably lower than those dehydrated in vacuum at 450 - 500 C. It is obvious that the ultimate adsorptive characteristics of the silver-containing zeolites are very dependent upon the formation of silver clusters and, therefore, on the dehydration conditions. We have found that best results are given when the silver- containing zeolites are dried at room temperature before being completely dehydrated in vacuum at a temperature of at least 450 C, but no greater than 500 C. The zeolites should be held at the dehydration temperature for a minimum of 4 hours. Heat of Adsorption and Energetic Heterogeneity. Heterogeneity in zeolites may result from a number of causes including a mixed population of charge compensating cations. If the intracrystalline cation composition is mixed, sites in the vicinity of a cation will differ for each cation whether or not they occupy equivalent crystallographic positions. Further, in a mixed cation population the proportion of one cation to another may vary from one cavity to another so that the behavior of the cavities as multiple sorption sites may vary throughout the crystal.3 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 sorbed increases. For small uptakes, the isosteric heat may decrease rather strongly with 59PDF Image | PSA USING SUPERIOR ADSORBENTS
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