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首页> 外文期刊>Chemistry: A European journal >Pickering emulsion stabilized by catalytic polyoxometalate nanoparticles: A new effective medium for oxidation reactions
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Pickering emulsion stabilized by catalytic polyoxometalate nanoparticles: A new effective medium for oxidation reactions

机译：催化多金属氧酸盐纳米粒子稳定的Pickering乳剂：新型有效的氧化反应介质

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摘要

Decyl-, dodecyl-, and tetradecyltrimethylammonium cations were combined with the catalytic polyoxometalate [PW _(12)O _(40)] ~(3-) anion to give spherical and monodisperse nanoparticles that are able to stabilize emulsions in the presence of water and an aromatic solvent. This triphasic liquid/solid/liquid system, based on a catalytic surfactant, is particularly efficient as a reaction medium for epoxidation reactions that involve hydrogen peroxide. The reactions proceed at competitive rates with straightforward separation of the phases by centrifugation. Such catalytic "Pickering" emulsions combine the advantages of heterogeneous catalysis and biphasic catalysis without the drawbacks (e.g., catalyst leaching or separation time). Mixing it up a bit: Spherical nanoparticles of decyl- and dodecyltrimethylammonium cations with [PW _(12)O _(40)] ~(3-) formed stable Pickering emulsions in the presence of an aromatic solvent and water. This system is an efficient medium for epoxidation (see figure).
机译：将癸基，十二烷基和十四烷基三甲基铵阳离子与催化性多金属氧酸盐[PW _（12）O _（40）]〜（3-）阴离子结合，得到球形和单分散的纳米颗粒，它们能够在水存在下稳定乳液和芳族溶剂。基于催化表面活性剂的这种三相液体/固体/液体系统作为涉及过氧化氢的环氧化反应的反应介质特别有效。反应以竞争性速率进行，通过离心直接分离各相。这样的催化“选择”乳液结合了非均相催化和双相催化的优点而没有缺点（例如，催化剂浸出或分离时间）。稍微混合一下：癸基和十二烷基三甲基铵阳离子与[PW _（12）O _（40）]〜（3-）的球形纳米粒子在芳香族溶剂和水的存在下形成稳定的Pickering乳液。该系统是高效的环氧化介质（见图）。

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