Zeolites P1 and L as precursors for the preparation of alkaline-earth zeolites

Abstract

Zeolites P1 (GIS) and L (LTL) are used as precursor materials for the preparation of synthetic analogues of the natural alkaline-earth zeolites brewsterite, heulandite, epistilbite, harmotome and yugawaralite. Crystallization of these zeolites is accomplished by hydrothermal treatment of the precursor zeolites with aqueous solutions containing an appropriate alkaline-earth cation. The effects of the composition of the starting zeolite, the composition of the solution phase and the presence or absence of seeds are discussed.