手性Salen-Co配合物在纳米Silica和壳核纳米Silica上的接枝及环氧化催化性能的研究  

The Catalytic Epoxidation of Olefins Using Chiral Salen-Co Complexes Grafted Nano-silicas

作　　者：周建波[1] 曾明[1] 伏再辉[1] 阳科[1] 崔小莹[1] 

机构地区：[1]长沙医学院基础医学系,湖南长沙410219

出　　处：《精细化工中间体》2015年第3期42-47,共6页Fine Chemical Intermediates

基　　金：湖南省教育厅基金资助项目(13C0455);湖南省科技厅科技计划项目(2014SK3025)

摘　　要：通过共价键将手性Salen-Co(Ⅲ)配合物接枝到纳米Silica和壳-核纳米Silica表面上制备固相催化剂,并且用红外光谱(FT-IR)、热重分析(TG-DTA)、透射电镜等表征手段对已制备的催化剂进行了表征,结果证实手性Salen-Co配合物成功接枝到了纳米Silica和壳-核纳米Silica表面。以反式二苯乙烯为反应底物,考察了所得固相催化剂的环氧化催化活性、选择性、e.e.值(对映体过量)和重复使用性能,从催化结果来看所得固相催化剂有一定的不对称催化活性,重复使用性能也比较好。The chiral salen-Co complexes were grafted onto nano-silica and core-shell nano-silica by covalent bond; TG-DTA, FT-IR, and transmission electron microscopy were used for characterization of the immobilized salen complexes. The results confirmed that the chiral salen-Co complexes were successfully attached to the surfaces of nano-silica and the core-shell nano-silica. The catalytic activity, selectivity and e.e% were also evaluated using the catalytic epoxidation reaction of E-stilbene. It was found that the immobilized catalysts showed higher conversion and better selectivity of E-stilbene. The heterogeneous catalysts after epoxidation could be recycled without significant loss of activity. These indicated that the chiral salen-Co complexes have been steadily bonded onto the nano-silica by covalent bond

关 键 词：Salen-Co(Ⅲ) 接枝 纳米Silica 壳-核纳米Silica 

分 类 号：TQ426.6[化学工程]