VERFAHREN ZUM EINBAU VON SILICIUM-ATOMEN ANSTELLE VON ALUMINIUMATOMEN IM KRISTALLGITTER EINES ZEOLITHEN DES FAUJASIT-TYPS.

摘要

Replacement of Al by Si in the crystal lattice of zeolites is effected by reacting an activated faujasite-type zeolite with a halosilane at a temp. below 150 deg. C, and washing the prod.. The zeolite is a Y-type zeolite of formula M2/nO.Al2O3.ySiO2.zH2O, where M is an n-valent cation (esp. Na), n = 1 or 2, y = 3-6 and z = 0-9. The halosilane is SiCl4. The reaction temp. is 80-120 deg. C. Washing is effected with an aq. buffer soln. followed by H2O, or with MeOH or EtOH followed by H2O. The prods. have a crystallinity of 80% or more (esp. 85-95%) and a cell constant ao of 2.450-2.465 (esp. 2.453-2.460)nm.