Abstract: Nanometer titania mesoporous powders were prepared by heating the mixed solution of titanium disulfate and polyethylene glycol(PEG-1000) in the presence of urea under hydrothermal conditions at 104 ℃.The texture, morphology and crystallite size of the synthesized nanoparticle powders were investigated by XRD, BET, TEM and DSC. The powders dried at room temperature and calcined at temperature below 850 ℃, their particles were spherical, well dispersed, ultrafine titania, with anatase phase. Their crystallite size increased from 8.56 to 48.82 nm with increasing the calcining temperature from room temperature to 850 ℃.The pore structure among particles, open-ended tubular pores, were mesoporous texture, the average pore diameters were from 10.36 to 27.25 nm.

Key words: Mesoporous powder, Anatase, Nano-titania