IN-SITU NMR-STUDY OF HYDROTHERMAL SYNTHESIS OF A TEMPLATE-MEDIATED MICROPOROUS ALUMINOPHOSPHATE MATERIAL - ALPO4-CJ2

To elucidate the formation mechanisms of crystalline microporous mater ials prepared under hydrothermal conditions, one needs to observe the hydrothermal medium while the material forms. One of the main objectiv es is to investigate whether the condensed phase forms from the assemb ly of molecular precursors in solution or from a solid phase transform ation. Therefore, In situ NMR was carried out to observe species prese nt in solution. The study was applied to formation of an amine-mediate d microporous oxyfluorinated aluminophosphate christened AlPO4-CJ2. In situ P-31, N-14, Al-27, and F-19, NMR study under hydrothermal condit ions at 423K allowed us to follow pH evolution during the synthesis an d to propose the structure of species in solution.