Abstract
EPR studies were performed for NaY zeolite samples of the faujasite type with an Si/Al ratio of 2.56 with a part of the Na + ions replaced by Cu 2+. A six-stops pathway of Cu 2+ migration in the faujasite network was postulated and the sites of copper complexes localization were determined vs the dehydration temperature varied from 25 to 400°C. Six different kinds of Cu 2+ complexes appear successively in the dehydration process: a hexahydrate copper complex rotating freely within the supercage and localized complexes of different water content. EPR parameter analysis in terms of MO-theory indicated four kinds of six-coordinated Cu 2+ complexes with the symmetry of tetragonally elongated octahedron ( D 4 h ) and two quasi-identical four-coordinated Cu 2+ complexes of pseudotetrahedral symmetry ( D 2 d ).
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