SYNTHESIS AND CHARACTERIZATION OF A FERRIERITE MADE BY RECRYSTALLIZATION OF AN ALUMINUM-CONTAINING HYDRATED MAGADIITE

A new method for the synthesis of high-silica ferrierite (Si/Al= 15-18 ) by recrystallization of aluminium-containing magadiite varieties in air-dry state and aqueous suspension with piperidine as template is re ported. Details on removal and thermal stability of the template occlu ded during the synthesis (four molecules per unit cell) are given. Pro perties (e.g. thermal and hydrothermal stability, acidity) of ferrieri tes prepared by the dry synthesis technique are presented and composit ional and morphological characteristics of the products are compared w ith those of ferrierite conventionally prepared from alkaline SiO2/Al2 O3 gel in aqueous medium. (C) 1998 Elsevier Science B.V. All rights re served.