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不同孔径咪唑官能化介孔材料固载手性Mn(III) salen催化剂

Immobilization of chiral Mn(III) salen catalyst on imidazole-functionalized mesoporous materials with different pore sizes

中文摘要英文摘要

通过正硅酸乙酯与和N-[3-(三乙氧基硅基)丙基]咪唑共缩聚制备了一系列不同孔径的咪唑官能化介孔材料,并将其用于固载手性Mn(III) salen化合物催化烯烃不对称环氧化反应,考察了载体孔径的精细调变对固载后的催化剂催化性能的影响。XRD、FT-IR、DR UV-vis和N2吸附表征的结果证明了Mn(III) salen化合物的成功固载。通过研究发现载体孔径的精细调变能够对非均相催化剂的催化性能产生较大的影响,对于这几种非均相催化剂,载体孔径越大,催化剂的催化活性和对映选择性越好。固载在较大孔径载体上的催化剂C18M-1表现出了最高的催化性能,在较低的用量和短的反应时间内表现出了与均相催化剂相当的催化活性和对映选择性。

In this paper, a series of imidazole-functionalized mesoporous materials with different pore sizes were synthesized by the co-condensation of tetraethyl orthosilicate and N-(3-triethoxysilylpropyl)imidazole, and adopted as supports to immobilize chiral Mn(III) salen complex. The results of XRD, FT-IR, DR UV-vis, and N2 sorption indicated the successful immobilization of chiral Mn(III) salen complex. The effect of pore size on the catalytic performance of the heterogeneous catalysts was studied for the asymmetric epoxidation of olefins. It was found that the activity and enantioselectivity were closely correlated with the pore sizes of parent supports. For the catalysts investigated, the catalytic activity and enantioselectivity were improved with the increase of pore sizes of parent supports. The catalyst C18M-1 with larger pore size gave the highest catalytic performance for the epoxidation of olefins, and comparable activity and enantioselectivity to those of homogeneous counterpart were achieved even with a very low catalyst dosage as well as a short reaction time.

蒋舒、于文军、杜焕玲、刘双喜、于凯、楼兰兰

精细化学工业

非均相催化孔径共缩聚介孔材料手性Mn(III) salen烯烃环氧化

Heterogeneous catalysisPore sizeCo-condensationMesoporous materialChiral Mn(III) salenOlefin epoxidation

蒋舒,于文军,杜焕玲,刘双喜,于凯,楼兰兰.不同孔径咪唑官能化介孔材料固载手性Mn(III) salen催化剂[EB/OL].(2013-10-17)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201310-179.点此复制

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