Abstract
Amorphous mesoporous AlPO4 materials were prepared by a gel precipitation method using different phosphate precursors [H3PO4, (NH4)H2PO4, and (NH4)2HPO4], both in the presence and absence of an aluminum-complexing assisted gel agent (1,2-ethanediol, 1,2- and 1,3-propanediol, and 2-methyl-2,4-pentanediol), followed by calcination in the 773−1273 K range. TG/DTA, XRD, and laser-Raman spectroscopy showed that the method assisted by an organic additive resulted in AlPO4 with higher thermal stabilities (crystallization was delayed), as well as high surface areas and pore volumes even after calcination at 1073/1273 K. In all cases, 27Al and 31P MAS NMR spectroscopy only indicated the formation of tetrahedral Al(OP)4 and P(OAl)4 units. Moreover, surface areas and pore volumes depended on the organic additive used. Thus, the AlPO4 obtained in the presence of 1,3-propanediol and 2-methyl-2,4-pentanediol possessed higher thermal stabilities that resulted in larger surface areas and pore volumes. Surface acidity mea...
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