HYDROTHERMALLY RESISTANT HIGH-SILICA Y-ZEOLITE STABILIZED BY COVERINGWITH NONFRAMEWORK ALUMINUM SPECIES

Authors
LUTZ W GESSNER W BERTRAM R PITSCH I FRICKE R
Citation
W. Lutz et al., HYDROTHERMALLY RESISTANT HIGH-SILICA Y-ZEOLITE STABILIZED BY COVERINGWITH NONFRAMEWORK ALUMINUM SPECIES, Microporous materials, 12(1-3), 1997, pp. 131-139
Citations number
21
Categorie Soggetti
Chemistry Physical","Material Science","Chemistry Applied
Journal title
Microporous materials → ACNP
ISSN journal
09276513
Volume
12
Issue
1-3
Year of publication
1997
Pages
131 - 139
Database
ISI
SICI code
0927-6513(1997)12:1-3<131:HRHYSB>2.0.ZU;2-3
Abstract
The hydrothermal stability of high-silica Y zeolites dealuminated by A l/Si substitution may be increased by alumination of the crystal surfa ce. The externally introduced non-framework aluminum species - alkali aluminosilicates or alumina - cover the surface where the water molecu les attack the terminal OH groups and energy-rich Si-O-Si bonds. An al kaline and combined acid/alkaline pathway of alumination are suggested . A reinsertion of aluminum into the zeolite lattice could not be obse rved. (C) 1997 Elsevier Science B.V.