【摘要】 超临界流体干燥法是制备大孔高比表面超细催化剂的有效方法之一［１］．我们曾考察了初始水凝胶ｐＨ值［２］及不同体系的絮凝剂［３］对纳米级ＴｉＯ２超细粉织构性质的影响．结果表明，选择一定浓度的强碱溶液作为絮凝剂，是制备大孔高比表面ＴｉＯ２超细粉的前提之一；...更多还原

【Abstract】 Ultrafine TiO 2 powders were prepared by hydrolysis of titanium tetrachloride, followed by supercritical drying process. The influences of preparation parameters,including temperature of preparation, titanium(Ⅳ) concentration and aging time on the textural properties of TiO 2 have been studied systematically. The results show that the preparation temperature has little effect on the properties of TiO 2 powders, and when the titanium(Ⅳ) concentration in the solution is ranged from 0.075 to 0.30 mol/L, the properties of TiO 2 obtained change slightly. The specific surface areas( S BET ) and pore volumes( V PN ) increase with the increase of aging time(≤96 h).更多还原