Venkatathri, N. ; Hegde, S. G. ; Ramaswamy, V. ; Sivasanker, S. (1998) Isolation and characterization of a novel lamellar-type aluminophosphate, AlPO4-L, a common precursor for AlPO4 molecular sieves Microporous and Mesoporous Materials, 23 (5-6). pp. 277-285. ISSN 1387-1811
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S1387-1811(98)00123-1
Abstract
Several aluminophosphate molecular sieves (AlPO4-5, AlPO4-22, AlPO4-16 and SAPO-35) are formed via a common lamellar aluminophosphate material (AlPO4-L) during hydrothermal synthesis from a gel containing Al2O3, P2O5, SiO2 and hexamethyleneimine (HEM) in aqueous (H2O), or non-aqueous (ethyleneglycol, EG) media. Depending on the concentration of the template HEM, AlPO4-L transforms into AlPO4-5, AlPO4-16 and AlPO4-22, while SAPO-L transforms into SAPO-35. AlPO4-L was isolated in a pure form from H2O as well as EG media and characterized by PXRD, SEM, TG/DTA, TG/MS and FTIR spectroscopic techniques. It is a lamellar aluminophosphate, intercalating HEM and H2O, and is thermally stable up to 250°C. AlPO4-L is believed to form by the rearrangement of macroanionic [3HEMH]3+Al3P4O3−16 sheets formed in the reaction medium.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | AlPO4-L; AlPO4-5; AlPO4-16; AlPO4-22; Aluminophosphates; Hexamethyleneimine; Molecular Sieves; SAPO-35; Synthesis |
| ID Code: | 47702 |
| Deposited On: | 12 Jul 2011 14:35 |
| Last Modified: | 12 Jul 2011 14:35 |
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