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.