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favorable energetic environment in a higher coordination. If the silver clusters are formed according to eqs. (1) and (2), then there is a loss of zeolitic framework oxygen with the reduction of Ag. This, along with the creation of a Lewis acid site, can create an energetically unfavorable environment and promote the migration of the silver cluster to a site of higher coordination. It is worth noting here that neutron powder diffraction spectra was also collected for an additional Ag-LSX sample which had been heat treated in an open air furnace at 450 C for 12 hours (followed by vacuum dehydration before loading into the vanadium canister as described earlier). This sample showed very little diffraction indicating a break down of the zeolitic crystallinity. This explains the very low N2 adsorption observed for a material which had been prepared in and identical manner (the isotherm is shown in Figure 4). Model for the Adsorption of Nitrogen by Ag-Exchanged Faujasites. There are several observations which can be made from the various N2 adsorption isotherms which were shown earlier in Figures 2, 4 and 5. Firstly, the adsorption of N2 on Ag-Y is quite low. The Ag-Y zeolite contained no SIII cations; and no cations at the SII*; although it did contain a significant number of cations in SII (similar to that of the Ag-X and Ag- LSX samples). The Ag-X sample had a higher N2 adsorptive capacity than that of Ag-Y. The sample, however, did not show any increase in N2 adsorption with heat treatment at 450 C over Ag-X which had been heat treated at 350 C; and the sample did not seem to be sensitive to heating in air. The Ag-X sample had a population of supercage cations in the SIII and SII locations. However, there were no cations in the SII* position. The N2 adsorptive capacity for the Ag-LSX sample increased with vacuum dehydration at 26PDF Image | PSA USING SUPERIOR ADSORBENTS
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