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fully exchanged Li94.5Na1.5-X-1.0 sample) to 21 (the Li73.8Na1.2Ag21-X-1.0 sample). This plot reveals that the incorporation of only a small amount of silver changes the adsorptive properties of the near fully exchanged Li94.5Na1.5-X-1.0 zeolite. With increasing additions of Ag+ (and corresponding removal of Li+ and Na+) the adsorption isotherms begin to take on more of the characteristics of the near fully exchanged Ag95.3Na0.3-X-1.0 material (i.e., the high “knee” at low pressures). Dehydration and Formation of Ag-clusters. As mentioned earlier, zeolites have a strong affinity for water; and some molecules are held tenaciously. The materials must be completely dehydrated prior to measurement of the adsorption isotherms in order to guarantee the validity of the result. Further, the dehydration conditions have a significant effect on the formation of silver clusters, with the atmosphere and temperature of the dehydration being the most important.17,18,21,23 For the near fully exchanged Li material there is no significant increase in the N2 capacity (or in the shape of the adsorption isotherm) for the material dehydrated at 450 C over that dehydrated at 350 C. This is expected as the majority of zeolitic water is easily removed by 250 C and most tenaciously held water molecules are removed by 350 C.4 However, the near fully exchanged Ag95.7Na0.3-X-1.0 sample does show an increase in N2 capacity after dehydration at 450 C over that of the same sample dehydrated at 350 C. This increase cannot be attributed a loss of water since all but the most tenaciously held water is removed by 350 C; and there is no increase in the N2 capacity for other zeolite forms (Li+, Na+, K+, etc.) with dehydration at temperatures beyond 350 C. This increase, therefore, was the result of the formation of charged silver clusters in the zeolite with dehydration at high temperature. 58PDF Image | PSA USING SUPERIOR ADSORBENTS
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