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Pickering Emulsion Stabilized by Catalytic Polyoxometalate Nanoparticles: A New Effective Medium for Oxidation Reactions
Author(s) -
Leclercq Loïc,
Mouret Adrien,
Proust Anna,
Schmitt Véronique,
Bauduin Pierre,
Aubry JeanMarie,
NardelloRataj Véronique
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201799
Subject(s) - polyoxometalate , catalysis , hydrogen peroxide , pickering emulsion , nanoparticle , chemistry , leaching (pedology) , dispersity , emulsion , solvent , chemical engineering , pulmonary surfactant , inorganic chemistry , organic chemistry , biochemistry , environmental science , soil science , engineering , soil water
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).