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| - Synthesis and Characterization of Lamellar andHexagonal Mesostructured Aluminophosphates UsingAlkyltrimethylammonium Cations as Structure-DirectingAgents
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| - Lamellar and hexagonal mesostructured aluminophosphates (AlPOs) were prepared andcharacterized. The lamellar mesostructured AlPO (APW-1) formed hydrothermally and thecondensed framework was composed of alternating AlO4 and PO4 units. The hexagonalmesostructured AlPO (APW-2) is formed by transformation of a layered precipitate composedof both aluminophosphate oligomers and alkyltrimethylammonium (ATMA) cations. CalcinedAPW-2 had a mesoporosity with the BET surface area of 980 m2 g-1 and a pore diameter of1.8 nm after substantial shrinkage of the framework. Lamellar APW-1 formed under mostof the conditions surveyed, while hexagonal APW-2 was obtained under very restrictedconditions. In this system, the charge matching in the products is the most important factor,although the assemblies of ATMA cations are essential as the structure-directing agents.
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