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number of clusters increases with framework Al content. It was also noted that in synthetic analogs of the faujasite zeolite (types X and Y), the dehydrated zeolites displayed a yellow color which increased in intensity with the number of clusters, while silver-exchanged A zeolites took a yellow color with dehydration at low temperatures, eventually becoming brick red after treatment at higher temperatures. In this work we have synthesized type X zeolites containing varying amounts of Li and Ag. We have treated these materials in a way which promotes the promotion of intracrystalline silver clusters; and we have evaluated the resulting adsorptive characteristics with respect to the gases which are of primary interest in the separation of air: N2, O2 and Ar. The performance of the best of these materials was compared to that of the fully Li+-exchanged zeolite using a numerical simulation of a standard five-step PSA cycle (that is used in industry); and the results are given below. Experimental Section Materials. 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. Helium (99.995%, prepurified), oxygen (99.6%, extra dry), nitrogen (99.998%, prepurified), and argon (99.998% prepurified) were obtained from Cryogenic Gases. All water used was deionized. 52PDF Image | PSA USING SUPERIOR ADSORBENTS
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