第 45 卷第 3 期 | | Vol. 45 No. 3 | 2015 年 6 月 | Jun 2015 |
|
所属栏目:功能材料
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 |
周建波,曾 明,伏再辉,阳 科,崔小莹
(长沙医学院 基础医学系,湖南 长沙 410219) |
摘 要: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。 |
关键词:Salen-Co(Ⅲ);接枝;纳米Silica;壳-核纳米Silica |
中图分类号:TQ426.6 文献标识码:A 文章编号:1009-9212(2015)03-0042-06 |
|
The Catalytic Epoxidation of Olefins Using Chiral Salen-Co Complexes Grafted Nano-silicas |
ZHOU Jian-bo, ZENG Ming, FU Zai-hui, YANG Ke, CUI Xiao-ying
(Changsha Medical University of Basic Medical System, Changsha 410219, China) |
Abstract: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. |
Key words:salen-Co(Ⅲ); graft; nano-silica; core-shell nano-silica |
|
基金项目: 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)。
|
作者简介: 周建波(1979-),女,湖南衡阳人,讲师,主要从事不对称催化合成(E-mail:229530464@qq.com)。
|
收稿日期: 2015-04-3
|
|