SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MICROPOROUS UMBITE, PENKVILKSITE, AND OTHER TITANOSILICATES

Citation
Z. Lin et al., SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MICROPOROUS UMBITE, PENKVILKSITE, AND OTHER TITANOSILICATES, JOURNAL OF PHYSICAL CHEMISTRY B, 101(36), 1997, pp. 7114-7120
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Physical
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
1520-6106 → ACNP
Volume
101
Issue
36
Year of publication
1997
Pages
7114 - 7120
Database
ISI
SICI code
1089-5647(1997)101:36<7114:SASCOM>2.0.ZU;2-4
Abstract
Synthetic analogues of the microporous minerals umbite (AM-2) and penk vilksite, polytype 20 (AM-3), have been prepared. The facile syntheses of two other titanosilicates, AM-1 and AM-4, have also been reported. AM-1 and the previously reported, layered titanosilicate known as JDF -L1 have been shown to have the same structure. AM-4 is a new micropor ous titanosilicate with a unique and unknown structure, containing eig ht different Na sites. All AM-n materials have been characterized by s everal techniques, viz. SEM, powder XRD, single-and triple-quantum Na- 23 and Si-29 MAS NMR, water adsorption measurements, and TGA/DSC. AM-n materials are thermally stable up to ca. 600 degrees C. The dehydrati on-hydration processes seem to be reversible (or quasi reversible) for AM-1, -2, and -3 but not so for AM-4.