Utilize este identificador para referenciar este registo: http://hdl.handle.net/10773/36189
Título: Synthesis and structural characterization of microporous umbite, penkvilksite, and other titanosilicates
Autor: Lin, Zhi
Rocha, João
Brandão, Paula
Ferreira, Artur
Esculcas, Ana P.
Jesus, Júlio D. Pedrosa de
Philippou, Andreas
Anderson, Michael W.
Data: 4-Set-1997
Editora: American Chemical Society
Resumo: Synthetic analogues of the microporous minerals umbite (AM-2) and penkvilksite, polytype 2O (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 microporous titanosilicate with a unique and unknown structure, containing eight different Na sites. All AM-n materials have been characterized by several techniques, viz. SEM, powder XRD, single- and triple-quantum 23Na and 29Si MAS NMR, water adsorption measurements, and TGA/DSC. AM-n materials are thermally stable up to ca. 600 °C. The dehydration-hydration processes seem to be reversible (or quasi reversible) for AM-1, -2, and -3 but not so for AM-4.
Peer review: yes
URI: http://hdl.handle.net/10773/36189
DOI: 10.1021/jp971137n
ISSN: 1520-6106
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