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CONCLUSION The adsorptive capacity of silver ion-exchanged faujasites can be affected by the specific conditions under which they are dehydrated. Low silica X zeolites seem to be especially sensitive to the dehydration conditions. Silver ion-exchanged Y zeolites had a low capacity for nitrogen adsorption due to a lack of easily accessible supercage cations. Silver ion-exchanged X zeolite had a much higher nitrogen adsorption capacity as expected since it contains readily accessible supercage cations in site III locations. However, the Ag-X zeolite did not show enhancement of the nitrogen adsorption with dehydration temperatures above 350 C. The silver ion-exchanged low silica X zeolites had a high nitrogen adsorption capacity which was enhanced with the presence of silver in site II* locations. Silver in this location in more easily accessible to the sorbate molecules than those in the more usual site II locations. The presence of these site II* cations seems to be affected by the dehydration temperature with the Ag-LSX-350 sample containing fewer SII* cations than that of the Ag-LSX-450 sample. The formation of these SII* cations seems to be the result of thermally induced cation and/or cluster migration from site I locations to locations fully in the sodalite cage. Mixed Li,Ag ion-exchanged zeolites have been synthesized and treated in ways that promote the formation of intracrystalline silver clusters. These samples were structurally characterized using Rietveld refinement of neutron powder diffraction data. Structural characterization revealed the presence of cations in a novel site II* in mixed Li,Ag-LSX zeolites that were vacuum dehydrated at 450 C. Cations in this site II* are more interactive with the atmospheric sorbates of interest than silver at the conventional 189PDF Image | PSA USING SUPERIOR ADSORBENTS
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