Selective epoxidation of unsaturated fatty esters over peroxophosphotungstic catalysts (POW) under solvent free conditions Study of the POW catalyst's mechanism

被引：21

作者：

Poli, Evelyne ^{[1
]}

Bion, Nicolas ^{[1
]}

Barrault, Joel ^{[1
]}

Casciato, Stefano ^{[2
]}

Dubois, Vincent ^{[2
]}

Pouilloux, Yannick ^{[1
]}

Clacens, Jean-Marc ^{[1
]}

机构：

[1] Univ Poitiers, Catalyse Chim Organ Lab, CNRS, UMR 6503,ESIP, F-86022 Poitiers, France

[2] Inst Meurice, Unite Chim Phys & Catalyse, B-1070 Brussels, Belgium

来源：

CATALYSIS TODAY | 2010年 / 157卷 / 1-4期

关键词：

Fatty acid methyl esters; Selective epoxidation; Green oxidation; H2O2; Peroxophosphotungstate catalyst; HYDROGEN-PEROXIDE; CHEMICAL-INDUSTRY; OXIDATION; PRODUCTS; ALKENES; OLEFINS; ACID;

D O I：

10.1016/j.cattod.2010.02.005

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Methyl oleate epoxidation with a peroxophosphotungstate (POW) catalyst was performed under solvent free conditions After underlying a synergistic effect of hydrogen peroxide and the dioxygen flow to obtain a total epoxide yield new investigations were realized to understand this effect The POW catalyst mechanism was studied using labeled oxygen flow and radical traps We concluded that the reaction occurs in two parallel ways a major one thanks to a concerted mechanism and a minor radicalar one leading to the formation of methyl stearate alcohol and diol intermediates Oxygen flow is only necessary to perform the radicalar way (C) 2010 Elsevier BV All rights reserved

引用

页码：371 / 377

页数：7

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