| 摘要 |
PURPOSE:To prepare a calcined titanium oxide, having a large surface area, improved strength and heat resistance, and suitable for a catalyst or catalytic carrier, by adding a fine particulate silicic acid to titanium sulfate, hydrolyzing the titanium sulfate heating, and drying and calcining the hydrolysis product. CONSTITUTION:A fine particulate silicic acid is added to hydrolyze titanium sulfate under heating, and the resultant hydrolysis product is then dried and calcined to prepare calcined titanium oxide. In the method, the titanium sulfate is hydrolyzed under heating preferably in the presence of a fine particulate silicic acid to produce metatitanic acid, which is then converted into a sol. The resultant sol is filtered, dried and calcined. The presence of the fine particulate silicic acid suppresses the crystal growth of the titanium oxide in calcination, and the ungrown anatase type crystals remain. Thus, the aimed calcined titanium oxide having a large surface area and improved mechanical strength and heat resistance is obtained. The resultant product is suitably used as a catalytic carier or directly as a catalyst. |
