SEVERAL FEATURES OF THE DEALUMINATION OF TYPE-Y ZEOLITE USING SILICON TETRACHLORIDE AND ETHYLENEDIAMINETETRAACETIC ACID

Dealumination of type Y zeolite using SiCl4 produces a statistically averaged distribution of Al and Si atoms in the framework. The action of H4EDTA causes defects in the backbone and partial amorphization of the zeolite. Extracellular particles containing Al from due to dealumination with SiCl4. The maximum number of these occurs at N(Al)bb = 5-16 atoms/unit cell. Treatment with H4EDTA has practically no effect on the composition of the particles, which are largely sodium cations. The extracellular particles localize both in sodalite cells and in large voids after dealumination with SiCl4.