手性钨酸离子液体空心介孔硅球用于苯乙烯双羟化反应
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1.中北大学;2.太原生态环境监测中心

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中图分类号:

TQ243.4

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


The chiral tungstic ionic-liquid hollow mesoporous silica spheres applied in dihydroxylation of styrene
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1.North University of China;2.Taiyuan Ecological Environment Monitoring Center

Fund Project:

The National Natural Science Foundation of China,The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    以1,12-二溴十二烷、S-烟碱和钨酸钠为原料制备手性钨酸离子液体,硅酸钠为硅源,经一步水热法制得功能化的空心介孔硅球。用SEM、TEM、FTIR、UV-Vis、N2吸附-脱附、XPS、ICP-OES、水接触角和圆二色谱(ECD)等对其结构进行表征,并考察其对于苯乙烯双羟化反应的催化性能。结果表明,空心介孔硅球的直径约为100 nm,比表面积为20 ~ 53 m2/g,平均孔径为7.7 ~ 16 nm;手性钨酸离子液体成功嵌入到介孔空心硅球,固体具有圆二色性,可用于苯乙烯双羟化反应,使n(W)∶n(Si)=0.25∶0.75时制得的催化剂催化性能最好、(R)-苯基乙二醇产率达89.6%,循环使用5次后产率仍可达87%;比较未含钨酸离子液体的样品为无定形纳米颗粒,因此推测钨酸基手性离子液体对介孔空心硅球形成具有导向作用。

    Abstract:

    A chiral tungstic ionic liquid was prepared with 1,12-dibromododecane, S-nicotine and sodium tungstate. Sodium silicate was taken as silicon source. And then functionalized hollow mesoporous silica spheres were prepared by a one-step hydrothermal method. They were characterized by SEM, TEM, FTIR, UV-Vis, N2 adsorption-desorption, XPS, ICP-OES, contact angles, electronic circular dichroism(ECD), etc. and their catalytic performance was investigated by the dihydroxylation of olefins. The results showed that the diameter of the hollow mesoporous silica sphere is about 100 nm, the BET surface area is 20-53 m2/g, and the average pore diameter is 7.7-16 nm. The chiral tungstic ionic liquid was successfully embedded in the mesoporous hollow sphere. The spherical solids presented the circular dichroism. The catalyst with n(W)∶n(Si)=0.25∶0.75 performed best during the olefin dihydroxylation reaction, with yield of (R)-phenylethylene glycol of 89.6% and even up to 87% after being recycled for 5 times. Since the contrast sample without tungsten was observed as amorphous nanoparticles, it can be speculated that the tungstic-based ionic liquid displayed a structure-directing effect on the formation of mesoporous hollow spheres.

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郭晓萍,孟慧琴,焦勇霞,王晓春,王俊飒,梁栋.手性钨酸离子液体空心介孔硅球用于苯乙烯双羟化反应[J].精细化工,2022,39(6):

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  • 收稿日期:2021-10-14
  • 最后修改日期:2022-03-20
  • 录用日期:2022-03-24
  • 在线发布日期: 2022-05-11
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