Pickering Emulsion Stabilized by Catalytic Polyoxometalate Nanoparticles: A New Effective Medium for Oxidation Reactions |
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| Authors: | Dr Loïc Leclercq Adrien Mouret Prof Dr Anna Proust Dr Véronique Schmitt Dr Pierre Bauduin Prof Dr Jean‐Marie Aubry Prof Dr Véronique Nardello‐Rataj |
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| Institution: | 1. Université Lille Nord de France, Université Lille 1, ENSCL, EA 4478, Chimie Moléculaire et Formulation, 59655 Villeneuve d'Ascq Cedex (France), Fax: (+33)?320‐470‐599;2. UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, 4 Place Jussieu, Case 42, 75005 Paris (France);3. Centre de Recherche Paul Pascal, Université de Bordeaux, UPR 8641‐CNRS, 115 Avenue du Dr. Albert Schweitzer, 33600 Pessac (France);4. Institut de Chimie Séparative de Marcoule, UMR 5257, CEA/CNRS/UM2/ENSCM, BP 17171 CEA Marcoule, F‐30207 Bagnols‐sur‐Cèze (France) |
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| Abstract: | Decyl‐, dodecyl‐, and tetradecyltrimethylammonium cations were combined with the catalytic polyoxometalate PW12O40]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). |
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| Keywords: | epoxidation nanoparticles oxidation Pickering emulsions polyoxometalates |
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