Synthesis of mesostructured aluminophosphates using cationic templating

Yaroslav Z. Khimyak, Jacek Klinowski

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Hexagonal (Hex-1, Hex-2 and Hex-3) and lamellar (L1 and L3) in esostructured aluminophosphates have been prepared at room temperature in the presence of a cationic surfactant. Transitions between different structures can be directed by modifying the behaviour of the surfactant and the degree of condensation of the inorganic component. The products differ in Al: P ratios, relative contents of 4- and 6-coordinate A1, degrees of condensation, template contents and thermal stabilities. The inorganic component in hexagonal and L3 products is less condensed than in L1 and L2 (previously synthesised at hydrothermal conditions) as evidenced by the predominant 6-coordination of Al and the low-field 31P NMR chemical shifts. Upon calcination, Hex-1 and Hex-2 give thermally stable mesoporous solids with a tubular pore arrangement. The pore diameter of the calcined hexagonal AlPO increases with the increased Al: P ratio.

Original languageEnglish
Pages (from-to)5275-5285
Number of pages11
JournalPhysical Chemistry Chemical Physics
Issue number22
Early online date30 Oct 2000
Publication statusPublished - 15 Nov 2000
Externally publishedYes

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