中孔分子筛Al-MCM-41制备及催化合成二芳基乙烷

以硅酸钠为硅源、硫酸铝为铝源、CTAB为模板剂，采用水热法合成了负载型固体酸Al-MCM-41中孔分子筛催化剂，并通过X射线衍射（XRD）、热重差热分析（TG-DTA）、扫描电镜（SEM）和红外（IR）方法对其进行了表征，同时研究了该催化剂在二芳基乙烷合成反应中的催化性能。考察了各种反应因素的影响，确定其最佳合成条件为：原料苯乙烯与二甲苯质量之比为1∶7.5，催化剂用量为1 %(总投料质量百分比)，反应时间为3 h，反应温度为140 ℃，产率可达87.1 %，比传统催化剂浓硫酸提高了17 %。研究结果表明，该催化剂是替代液体酸合成二芳基乙烷的理想固体酸催化剂。

Preparation for Mesoporous Molecular Sieve Al-MCM-41 and The Catalytic Synthesis of Diphenylethane

Al-MCM-41 mesoporous sieves were synthesized by using Na2SiO3 as silica source, Al2(SO4)3 as aluminum source, and cetyltrimethylammonium bromide (CTAB) as template agent under hydrothermal condition. The Al-MCM-41 mesoporous sieves were characterized by X-ray diffraction (XRD), thermogravimetry differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and infrared spectroscopy (IR). The synthesis of diphenylethane over Al-MCM-41 catalyst and its catalytic performance were investigated. The results showed that the optimal conditions were: the mass percent of catalyst is 1 % of feed stock; molar ratio of xylene to styrene is 7.5: 1; reaction temperature is 140 °C and reaction time is 3 h. The yield of diphenylethane under such conditions was about 87.1 %, which was 17 % higher than the yield when using traditional sulfuric acid as catalyst. The results showed that Al-MCM-41 is a promising solid acid catalyst for synthesis of diphenylethylane instead of liquid acid.