【摘要】 与嫁接法相比,我们选择一种新颖可控的方法将碱性功能化离子液体分散到SBA-15分子筛中,得到固载碱性功能化离子液体.通过X射线衍射、N2吸附/脱附、热重分析和傅里叶变换光谱对其结构进行表征,并以Knoevenagel反应做为模板反应,考察该催化剂的催化活性.结果表明,我们所合成的催化剂比后嫁接法制备的催化剂具有更规则的有序介孔结构、更高的离子液体负载量和更好的催化活性.将此催化剂应用在无溶剂条件下的Henry反应中,同样得到了较好的催化性能和循环使用次数.更多还原

【Abstract】 Compared with post-grafting method, a novel and controllable strategy is applied to introduce highly dispersed ionic liquid species into mesoporous SBA-15 silica, providing simpler synthesis steps, more uniform surface coverage and higher loading of ionic liquid, with fewer raw materials. Basic task-specific ionic liquids are synthesized and characterized by X-ray diffraction, N2adsorption-desorption, thermogravimetry and fourier transform infrared spectroscopy. The results showed that the catalysts, prepared by co-condensation method, have better ordered mesostructure and higher loading of ionic liquid than those by post-grafting approach. Meanwhile, the catalysts exhibit much higher activity than those by post-grafting approach in Knoevenagel condensation. Furthermore, these supported catalysts are also proven to be efficient and reusable in Henry reaction under solvent-free conditions.更多还原