SYNTHESIS OF ORDERED ALUMINOPHOSPHATE AND GALLOALUMINOPHOSPHATE MESOPOROUS MATERIALS WITH ANION-EXCHANGE PROPERTIES UTILIZING POLYOXOMETALATE CLUSTER SURFACTANT SALTS AS PRECURSORS/

Ordered nonlamellar mesoporous aluminophosphates and galloaluminophosp hates have been synthesized by introducing phosphate linking groups to cluster/surfactants salts of prearranged AlO4Al12(OH)(24)(H2O)(12)(7) (Al-13) and GaO4Al12(OH)(24)(H2O)(12)(7+) (GaAl12) tridecamers. The Al-13 and GaAl12 polyoxacations forma layered mesoscopic salt with The anionic surfactant sodium dodecylsulfate. Upon the reaction with a bu ffered hydrogen phosphate/dihydrogen phosphate solution the layers of clusters are transformed into a nonlayered, neatly hexagonal mesoscopi c phase. Removal of the surfactant from the alumino- and galloaluminop hosphates by anion-exchange results in mesoporous materials with BET s urface areas up to 630 and 455 m(2)/g, respectively. FT-IR and Al-27 a nd P-31 MAS-NMR as well as Al-21-->P-31 cross-polarization experiments indicate that the phosphate treatment results in the formation of new bonds between aluminate and phosphate species. A fraction of the clus ters are transformed leading to an increase in the number of tetrahedr al aluminate groups in the product. Multiple anion-exchange,e.g., with acetate, dichromate, or naphthol yellow S ions, is possible in these open mesoporous structures, which form a new class of inorganic anion- exchangers.