Hydrothermally resistant high-silica Y zeolites stabilized by covering with non-framework aluminum species

Autor:	R. Bertram, W. Lutz, W. Gessner, R. Fricke, I. Pitsch
Rok vydání:	1997
Předmět:	Materials science Inorganic chemistry General Engineering chemistry.chemical_element General Chemistry Alkali metal Hydrothermal circulation High silica Crystal chemistry Aluminosilicate Aluminium Molecule General Materials Science Zeolite
Zdroj:	Microporous Materials. 12:131-139
ISSN:	0927-6513
DOI:	10.1016/s0927-6513(97)00070-9
Popis:	The hydrothermal stability of high-silica Y zeolites dealuminated by Al/Si substitution may be increased by alumination of the crystal surface. The externally introduced non-framework aluminum species — alkali aluminosilicates or alumina — cover the surface where the water molecules attack the terminal OH groups and energy-rich Si-O-Si bonds. An alkaline and combined acid/alkaline pathway of alumination are suggested. A reinsertion of aluminum into the zeolite lattice could not be observed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f36d8ae7b2f8bb0eb65b3fd1e72128f https://doi.org/10.1016/s0927-6513(97)00070-9 Zobrazit plný text záznamu Full Text from ScienceDirect