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sites SI, SI′, SII, and SII′ with an approximately 17.5 silver atoms located in supercage SIII locations. As mentioned earlier, the population at SI′ were split into two sites, referred to as SI′ and SI′*; and the silver in site II′ was found in two sites, referred to as SII′ and SII′*. The interatomic distances between Ag(I) and Ag(I′) and Ag(I′*) are too short (at 1.30 Å and 2.23 Å respectively) to occur simultaneously. Contrary to previously reported results, no cations were found at SI′ positions which would allow SI′-SI-SI′ triatomic clusters. However, there are silvers clusters are present since the material, upon vacuum heating, turned the characteristic golden yellow color associated with charged silver clusters. The Ag(I′)-Ag(II′) distance, at 3.17 Å, is consistent with that expected for clusters.14 However, if there are clusters at these positions, then it would seem unlikely that they also exist at the same locations in the Ag-Y zeolite, since the Ag-Y sample did not turn yellow with vacuum dehydration. The Ag(I′)-O3, Ag(II)-O2, and Ag(II′*)-O2 interatomic distances, at 2.29 Å, 2.30 Å and 2.29 Å respectively, are all consistent with Ag+ in 3-coordination. When compared with the previous results, as shown in Table 8, the occupancies are somewhat similar to those reported by Gellens.14 Contrary to that predicted from previous studies, there is a small population of Ag at SI (only 3.1 of a possible 16 per unit cell). However, there is a excess population in the site I′ locations. The 32.5/uc at the site I′ locations (SI′ and SI′*) and the 3.1/uc at SI exceeds the allowable amount for these sites. This may be the result of tenaciously held water molecules at the SI location. The explanation helps to explain the excess of Ag atoms found for the entire model. The population at SII was very similar to that for Ag-Y indicating a strong preference for this site among the faujasite zeolites. The total population at sites II, II′ and II′* exceeds that 23PDF Image | PSA USING SUPERIOR ADSORBENTS
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