Insertion of Gallium Oxide into α-Titanium Phosphate Using a Surfactant Expanded Phase as Precursor

Intercataled gallium oxide in a-titanium phosphate materials can be synthesized using a swelled phase such as cetyltrimethylammonium titanium phosphate as precursor. This is prepared in a single step by hydrolysis of titanium iso-propoxide with phosphoric acid via a supramolecular long-range ordered organic species acting as a template, which by cationic exchange with gallium oligomers and ulterior calcination at 823 K gives rise to mesoporous solids. These materials exhibit high speci5c surface areas close to 150 m 2 g 21 , high acidity predominantly of the Lewis type, which are active as catalysts in the conversion of the 2-propanol dehydration reaction at 493 K with conversions ranging between 50 and 83%, and total selectivities for propene. ( 1999 Academic Press