Abstract: Mesostructured TiO2 was prepared hydrothermally using cetyltrimethylammonium bromide (CTAB) as the structure directing agent, and the mesoporous Ti-P-Al material with high thermal stability was subsequently synthesized by a two-step post-synthetic treatment. The sample was characterized by powder X-ray diffraction, transmission electron microscopy, and N2 adsorption. It was found that the composition of the starting gel system greatly affected the mesostructure of TiO2 materials greatly. With the gel composition of Ti(SO4)2∶CTAB∶H2O=1∶0.54∶430 and after being treated at 363 K for 10-20 min, an ordered TiO2 mesostructure was obtained, which presented better long-range order after being treated with 0.25 mol/L phosphoric acid solution. Further treatment with AlCl3 solution resulted in a mesoporous Ti-P-Al material with high thermal stability, which had a high BET specific surface area of 382 m2/g and a pore size of 3.13 nm after calcination at 873 K.

Key words: titanium, phosphorus, aluminium, mesoporous material, post-synthetic treatment, thermal stability