Synthesis, thermal and structural characterization of alumina-based pillared α-Ti(IV)hydrogenphosphate

摘要: The intercalating properties of α-titanium hydrogenphosphate with general formula Ti(IV)(HPO4)2·H2O (denoted as α-TiP in the following) have been evaluated by preparing two precursors, synthesized intercalation hydroalcoholic solutions n-hexylamine and n-octylamine into layers α-TiP. obtained slightly hydrolyzed, interlayer distances two, three or four times larger then starting material. Afterward, several alumina-pillared derivatives were prepared an aluminum Keggin-type ion [AlO4Al12(OH)24(H2O)12]7+, denoted Al13, precursors. No evidence presence previously intercalated amines was revealed studying thermal behavior so-prepared Al-intercalated materials that subsequently calcined air at 600 °C, thus providing thermally stable pillared alumina-based materials. BET surface areas on α-TiP-Al2O3 are not noticeable high (from 15 to 55 m2 g−1). However, highest value is than same temperature (layered-TiP2O7). Finally, preliminary catalytic tests performed 1-butene isomerization 450 °C for 80 min, results confirmed Bronsted acid sites PO3–OH groups involved responsible obtained. It also possible preliminarily conclude strength from medium weak.