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EXECUTIVE SUMMARY Li-X zeolite (Si/Al = 1.0) is currently the best sorbent for use in the separation of air by adsorption processes. In particular, pressure swing adsorption (PSA) using zeolite sorbents is being increasingly used for air separation. Silver is also known to strongly affect the adsorptive properties of zeolites; and it is known that thermal vacuum dehydration of silver zeolites leads to the formation of silver clusters within the zeolite. In this work we have synthesized type X zeolites containing Ag and also varying mixtures of Li and Ag. In this project, we developed the Ag-containing zeolite as the best sorbent for air separation. We have also studied Co-ligand compounds as oxygen- selective sorbents. Syntheses, structural characterization and adsorption properties have been performed on all sorbents. The results are described in detail in 5 chapters. In Chapter 1, we report the structure of pure Ag-X zeolites. We also studied the adsorption properties in relation to the structure of pure Ag-faujasite zeolites. We first synthesized silver zeolites of the types Y, X and low silica X (LSX). The zeolites were treated in such a way as to promote the formation of intracrystalline charged silver clusters. Equilibrium isotherms were measured for adsorption of nitrogen for each of the zeolites after various heat treatments and dehydration. Silver cations and clusters were quantitatively located using Reitveld refinement of neutron powder diffraction data. The neutron diffraction experiments were performed at NIST. Color changes upon heat treatment and subsequent X-ray photoemission spectroscopy confirmed some reduction of Ag+ -> Ag0. The effects of various dehydration conditions, including the time, temperature and atmosphere, are discussed. Silver clusters in Ag-LSX zeolites showed 4PDF Image | PSA USING SUPERIOR ADSORBENTS
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