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以三嵌段共聚物P123(EO20PO70EO20)为模板剂、正硅酸乙脂(TEOS)为硅源、氯化氢(HCl)为催化剂,通过水热法制备了介孔Si O2(SBA-15)微球,并以之为载体,制备了SBA-15负载Karstedt催化剂。通过扫描电子显微镜、小角X射线衍射、透射电子显微镜、氮气等温吸附–脱附实验等对催化剂形貌和结构进行表征。结果表明:催化剂直径为2~4μm,该微球具有高度有序二维贯通介孔结构,最可几孔径分布为4.5 nm,比表面积高达628 m2/g。以1-十八烯和三甲氧基硅烷硅氢加成反应为探针反应,研究了不同温度下催化剂的催化性能。当催化剂用量为反应物质量的5%、反应温度为80℃、反应时间为5 h时,1-十八烯转化率可达67.2%,反应活化能为9.176 k J/mol。
The mesoporous Si O2 (SBA-15) microspheres were prepared by hydrothermal method using the triblock copolymer P123 (EO20PO70EO20) as templating agent, tetraethoxysilane (TEOS) as the silicon source and hydrogen chloride , And use it as a carrier to prepare SBA-15 supported Karstedt catalyst. The morphology and structure of the catalyst were characterized by scanning electron microscopy, small angle X-ray diffraction, transmission electron microscopy, nitrogen isothermal adsorption-desorption experiments. The results show that the diameter of the catalyst is 2 ~ 4μm. The microspheres have a highly ordered two - dimensional through-pore structure. The most pore size distribution is 4.5 nm and the specific surface area is up to 628 m2 / g. The catalytic performance of the catalyst at different temperatures was investigated by the hydrosilylation reaction of 1-octadecene and trimethoxysilane. The conversion of 1-octadecene reached 67.2% and the activation energy was 9.176 kJ / mol when the amount of catalyst was 5% of the reactant, the reaction temperature was 80 ℃ and the reaction time was 5 h.