Thermal analysis of large pore microporous zincophosphates

Citation
La. Garcia-serrano et al., Thermal analysis of large pore microporous zincophosphates, THERMOC ACT, 376(2), 2001, pp. 155-162
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
THERMOCHIMICA ACTA
ISSN journal
0040-6031 → ACNP
Volume
376
Issue
2
Year of publication
2001
Pages
155 - 162
Database
ISI
SICI code
0040-6031(20010907)376:2<155:TAOLPM>2.0.ZU;2-Q
Abstract
Samples of tridimensional microporous zinc phosphates with fully connected framework with faujasite (FAU) and chiral zincophosphate (CZP) structures h ave been prepared and characterized by thermal analyses comprising TGA, TGA -MS and in situ thermal XRD. They have been also characterized by ICP and C -13 MAS NMR. Analyses of the ZnPO-FAU demonstrate that the tetramethylammonium (TMA(+)) cations are incorporated preferentially in the P-cages and that this materi al is stable up to 673 K. The crystallinity of the sample only decreases wh en the TMA+ cations located in the P-cages are eliminated (above similar to 723 K). In the case on ZnPO-CZP the thermal removal of the water more strongly held by the structure produces a marked decrease of crystallinity at similar to 523 K (C) 2001 Elsevier Science BN. All rights reserved.