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which is allowable without some simultaneous occupancy (which are not allowed due to the short interatomic distances). Ag-LSX-350 and Ag-LSX-450. As with previous samples, the agreement of the experimental data and the refined model are good (Rf2 = 0.0818, χ2 = 1.631 for Ag-LSX- 350 and Rf2 = 0.0825, χ2 = 1.686 for Ag-LSX-450) and nearly all silver atoms were located in both samples. The silver was primarily found in the six-ring sites with 17.2 silver atoms per unit cell were located in SIII locations for Ag-LSX-350 and approximately 19/uc were located for Ag-LSX-450. However, since more total cations were located for the Ag-LSX-450 sample (96.7 versus 92.9 for the Ag-LSX-350 sample), the occupancy of SIII for these zeolites are actually likely to be practically the same. As with the Ag-X sample, the site I′ population was split into the two sites SI′ and SI′* for both samples. Unlike previous samples, both of these sample also had a split population of cations in site II, in the distinct sites SII and SII*. Both of these samples contain silver clusters, since, upon vacuum heating, both turned the characteristic deep golden yellow color associated with charged silver clusters in faujasite zeolites. The inter-atomic distance for the SI-SI′ sites, at 3.14 Å for both samples, is consistent with those reported14 for the linear (Ag)3 clusters at SI′-SI-SI′. The short distance between Ag(I′) and Ag(I′*), at approximately 0.83 Å, and the Ag(I)- Ag(I′*) distance of 2.30 Å are too short to allow simultaneous occupancy of these sites. However, the Ag(I′*)-Ag(II′) interatomic distance of 3.10 Å is consistent with previously reported Ag cluster distances and, while the distance between Ag(II′)-Ag(II), at 2.09 Å, is too short to allow simultaneous occupancy, the Ag(II′)-Ag(II*) distance, at 3.33 Å for the Ag-LSX-450 and 3.53 Å for the Ag-LSX-350 sample, is not.14 Therefore, it seems likely 24PDF Image | PSA USING SUPERIOR ADSORBENTS
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