Abstract
A new mesoporous aluminophosphate (AlPO4) has been synthesized through hydrothermal transformation of a lamellar mesostructured aluminophosphate prepared in the presence of a neutral surfactant dodecylamine (DDA) under mild alkaline pH conditions and using water–ethanol mixture as the synthesis medium. Post-synthesis hydrothermal treatment was carried out at 448 K for 72 h in the presence of dilute aqueous phosphoric acid, which results this phase transformation. Lamellar and mesoporous phases of these samples were revealed from powder X-ray diffraction, SEM-EDS, transmission electron microscopic image analysis, 31P MAS NMR a FT IR spectroscopic studies and thermal analysis. N2 sorption studies revealed the existence of pores with dimension of small mesopores after H3PO4 treatment. Pillaring of the interlayers through PO4 units during post-synthesis hydrothermal treatment could be responsible for the transformation of lamellar to mesoporous phase.
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