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were used as is. Silver nitrate (AgNO3, 99.9%, Strem) was used in the preparation of ion- exchange solutions. Deionized water was used for the preparation of all ion-exchange solutions and for sample washing. Helium (99.995%) and nitrogen (99.998%) were obtained from Cryogenic Gases and were used for isotherm adsorption measurements without further purification. Synthesis of Ag-exchanged Faujasites. The silver zeolites were prepared using standard ion-exchange methods. A zeolite sample was exchanged by contacting the material two times with a 0.5 M aqueous AgNO3 solution. Each silver solution contained a cation content which was in two-fold excess of what was required to achieve 100% exchange. The ion-exchange solution was heated to a mild boil with constant agitation and immediately allowed to cool and settle. After the first ion-exchange, the solution was decanted, fresh solution was added, and the mixture was reheated. After the second ion- exchange, the material was vacuum filtered and washed with copious amounts of water until no precipitate was seen upon treatment with free chloride. The silver exchanged samples were dried at room temperature and atmospheric conditions in a dark area. The resulting materials were dehydrated prior to analysis, as described below. Sample Dehydration. Zeolites have a strong affinity for water; and some molecules are tenaciously held. The presence of adventitious water will affect both the cation coordination in the zeolites, as determined through powder diffraction analysis, and the adsorption of guest molecules, as measured by adsorption isotherms. Furthermore, dehydration conditions strongly influence the formation of silver clusters. To separate these effects, the atmosphere, temperature and length of time of dehydration were rigorously controlled. 13PDF Image | PSA USING SUPERIOR ADSORBENTS
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