A Ti-substituted polyoxometalate as a heterogeneous catalyst for olefin epoxidation with aqueous hydrogen peroxide

被引：30

作者：

Hua, Li ^{[1
]}

Qiao, Yunxiang ^{[1
]}

Yu, Yinyin ^{[1
]}

Zhu, Wenwen ^{[1
]}

Cao, Ting ^{[1
]}

Shi, Yu ^{[1
]}

Li, Huan ^{[1
]}

Feng, Bo ^{[1
]}

Hou, Zhenshan ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China

来源：

NEW JOURNAL OF CHEMISTRY | 2011年 / 35卷 / 09期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

TITANIUM CATALYSTS; ALLYLIC ALCOHOLS; IONIC LIQUID; W-183; NMR; OXIDATION; ALKENES; SILICA; SITE; POLYOXOTUNGSTATES; REACTIVITY;

D O I：

10.1039/c1nj20312f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The Ti-substituted polyoxometalates ([C(12)mim](5)PTiW11O40, [CTA](5)PTiW11O40 and [TBA](5)PTiW11O40) were prepared and characterized by FT-IR, NMR, UV-vis and ICP-AES. Then the polyoxometalates (POM) were used as catalysts for the epoxidation of various olefins. It was found that the organic countercations had a considerable effect on the catalytic performance. In addition, UV-vis and the FT-IR spectroscopy indicated that the peroxo structure regarded as the active site for oxygen transfer was present even after the reaction, which led to the increasing reaction rate in the second run due to the disappearance of the induction period, as compared with that in the first run. A heterogeneous reaction mechanism has been suggested in olefin epoxidation catalyzed by a Ti-substituted polyoxometalate ([C(12)mim](5)PTiW11O40) with aqueous hydrogen peroxide in ethyl acetate. The heterogeneous POM catalyst can be easily separated and recycled eight times without decreasing the catalytic activities.

引用

页码：1836 / 1841

页数：6

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