ZEOLITE-P1 AND ZEOLITE-L AS PRECURSORS FOR THE PREPARATION OF ALKALINE-EARTH ZEOLITES

Zeolites PI (GIS) and L (LTL) are used as precursor materials for the preparation of synthetic analogues of the natural alkaline-earth zeoli tes brewsterite, heulandite, epistilbite, harmotome and yugawaralite. Crystallization of these zeolites is accomplished by hydrothermal trea tment of the precursor zeolites with aqueous solutions containing an a ppropriate alkaline-earth cation. The effects of the composition of th e starting zeolite, the composition of the solution phase and the pres ence or absence of seeds are discussed. (C) 1997 Elsevier Science B.V.