Solid-state ion exchange in H-SAPO-34: electron spin resonance and electron spin echo modulation studies of copper(II) location and adsorbate interaction

Abstract

ESR and ESEM are used in this paper to study Cu(II) ion location and interaction with water, alcohols, ammonia, and ethylene in the solid-state reactions of H-SAPO-34 with various copper compounds (CuO, CuCl{sub 2}, CuF{sub 2}). The Cu(II) ions migrate from the exterior to the interior of the molecular sieve similar to an aqueous ion exchange method. Two types of Cu(II) complexes form during the adsorption of methanol, but only one complex type forms with the rest of the adsorbates. Cu(II) interactions with other adsorbate molecules are also discussed. 20 refs., 3 figs., 2 tabs.