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The results showed that the new sorbent provides a significantly higher (>10%) product throughput, at the same product purity and recovery, when compared to that of the fully Li+-exchanged zeolite (Yang and Hutson, 1999). The location of the extraframework silver in relation to the aluminosilicate framework is of primary importance for elucidating the effect of silver cations or clusters on the adsorptive characteristics of the zeolite. In this work, we have synthesized mixed Li,Ag ion-exchanged zeolites and treated these materials in ways that promote the formation of intracrystalline silver clusters. These samples were structurally characterized using Rietveld refinement of neutron powder diffraction data. The structural data were then related to the adsorptive characteristics of the mixed-cation zeolites for the gases that are of primary interest in the separation of air: N2, O2 and Ar. Synthesis and Analysis Two type-X zeolites, differing only by the Si/Al ratio, were used in this work. These were: (1) X-type zeolite with a Si/Al of 1.0 (Praxair, #16193-42, sometimes referred to as LSX, low silica X-zeolite), and (2) X-type zeolite with a Si/Al of 1.25 (Linde, lot 945084060002). Both of these materials were binderless, hydrated powders. The unit cell for faujasite zeolites (Y, X, LSX), including conventional designation of cation sites, is shown in Figure 1. Since the sodium form of the zeolite exchanges more readily with most cations in consideration, all zeolites were first ion-exchanged with a solution of sodium chloride in order to convert to the Na+ form. A dilute NaOH solution was used to keep the NaCl solution at pH 9. This helps to prevent hydrolysis and breakdown of the zeolite crystal 88PDF Image | PSA USING SUPERIOR ADSORBENTS
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