关键词: 复合载体, 模板剂, 表征, 制备条件

Abstract: Samples of TiO2-Al2O3 composite support were prepared using modified sol-gel method and the effects of preparation conditions were investigated. The prepared samples were characterized by nitrogen adsorption-desorption, XRD and TEM techniques. Results showed that samples prepared according to the procedure of trickling titanium sol into the mixture of alumina and ethanol possessed large specific surface area; TiO2 and Al2O3 existed as anatase and γ-Al2O3 crystals in the composite support, respectively; fine nano-TiO2 particles were well distributed on the Al2O3 crystal surfaces. The optimal preparation conditions of TiO2-Al2O3 composite support were as follows: using the procedure of trickling titanium sol into the mixture of alumina and ethanol, with a template/tetrabutyl titanate molar ratio of 0.5, using cetyl trimethyl ammonium bromide (CTAB) as template and a calcination temperation of 550 ℃.

Key words: composite support, template, characterization, preparation condition