摘 要: 利用表面活性剂十八烷基三甲基溴化铵( STAB) 为模板、正硅 酸乙酯(TEOS) 为硅源、盐酸为催化剂, 在较低的表面活性剂浓度下 ( 小于 4%) 合成了介孔氧化硅, 并研究了不同的反应条件对介孔结构 及有序度的影响。在热乙醇萃取或者高温煅烧除去模板剂之后, 利用 红外(IR) 、X 射线电子衍射(XRD) 、高分辨透射电子显微镜(HRTEM) 以及 N2 的吸附- 脱附曲线对合成的介孔材料进行了表征。结果表明, 合成的介孔氧化硅具有 MCM- 41 型有序的孔道结构、大的孔体积( 不 小于 1 cm³/g) 和 BET 比表面积( 不小于 1 400 m²/g) , 孔径均一且分布 较窄。 

关键词: 介孔氧化硅; 乙醇萃取; 模板

Abstract: Using the surfactant stearictrimethyl ammonium bromide (STAB) as a template, mesoporous silica was prepared by hydrolyzation of TEOS under acidic conditions, and the affection of different reaction conditions to the structure and ordering of mesoporous materials was dis cussed. The template was removed by ethanol-extraction or calcined, and the mesoporous silica was then characterized by FT-TR, XRD, HRTEM and N2 adsorption- desorption isotherm. The experimental results exhibit ed that a MCM- 41 mesoporous silica material with large BET surface (>1 400 m²/g) and pore volume (>1 cm³/g), uniform and narrow pore-dis tribution was prepared. 

Keywords: mesoporous silica; ethanol extraction; template