Phillipsite is one of the main components of the sedimentary zeolite-rich rocks called zeolitites used in a variety of applications (i.e., in the field of pollution abatement and agriculture). The interest for the understanding of the cation exchange properties for a proper and efficient use in industrial applications prompted in 1995 a long term project on the systematics of cation exchanged phillipsites, their crystal chemistry and properties. Natural phillipsite samples with different Si/(Si+Al) ratio were selected for the research project and exchanged with a number of either monovalent and divalent cations. In this paper we describe a general picture of the changes which occur in the structure of phillipsite in response to the cation exchange either in terms of framework relaxation/contradion and cation migration, ion exchange selectivity and properties, and their prediction.

Ion exchange selectivity of phillipsite / Gualtieri, Alessandro; Passaglia, Elio; Galli, Ermanno. - 142(2002), pp. 1705-1712. ((Intervento presentato al convegno 2nd International Conference of the Federation-of-European-Zeolite-Associations tenutosi a TAORMINA, ITALY nel SEP 01-05, 2002.

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