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Li93.3Ag2.0Na0.7-LSX Structure These samples contained only a small amount of silver and, as a result, there was only a slight difference in the diffraction pattern as compared to that of fully Li-exhanged LSX. This makes the Rietveld refinement very difficult (Reisner, 2000). In approaching this refinement, it was necessary to use information of the behavior of lithium and silver from the previous samples. It was also necessary to use what was already know of the behavior of silver in near-fully exchanged LSX zeolite (Hutson et al., 2000). The results of the Rietveld refinement for the Li93.3Ag2.0Na0.7-LSX zeolite (after vacuum dehydration at 350 C and at 450 C) are shown in Table 4; and the agreement of the experimental and the refined model were very good (χ2 = 1.233 for the sample heated to 350 C and χ2 = 1.319 for the sample heated to 450 C). The overall structures of these samples are very similar to that described earlier for the Li95.8Na0.2-LSX sample. Almost all of the lithium cations were located (86.4 and 89.5 of the 93.3 expected). As with the Li95.8Na0.2-LSX sample, the lithium cations were located in the six-ring sites, SI′ and SII, and in the supercage 4-ring SIII site; and a slight over-population was located at the SII site (34.9 cations at SII for both samples). The mixed Li,Ag-LSX sample that had been heated to 350 C only had silver located in the SII' location. Almost all of the silver was located (1.7 of the expected 2.0 per unit cell). The sample that had been heated to 450 C, however, had a population of 0.9 silver in both SII and SII' (which provided the location of 1.8 of the 2.0 Ag expected). A schematic of the sodalite cage and double six-ring (hexagonal prism) showing the sites for lithium and silver occupancy is shown in Figure 3. Adsorption 96PDF Image | PSA USING SUPERIOR ADSORBENTS
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