Synthesis and catalytic activity of periodic mesoporous materials incorporating gold nanoparticles

Carmela Aprile, Alberto Abad, Hermenegildo García, Avelino Corma

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Résumé

A mesoporous silica containing gold nanoparticles (mpAu-SiO2) has been obtained by one pot synthesis, starting from tetraethylorthosilicate (TEOS) and colloidal gold particles (2-5 nm) stabilized with N-[3-(triethoxysilyl)propyl] O-2(dicetylmethylammonium)ethyl urethane. This stabilizer ligand interacts with gold nanoparticles through the quaternary ammonium ions, whose long chains also show affinity for the cetyltrimethylammonium surfactant. On the other hand, the triethoxysilyl group is adequate to undergo co-condensation with TEOS during the formation of the silica. The periodic mesoporous structure of the mpAu-SiO2 materials was assessed by X-ray diffraction, TEM and isothermal gas adsorption of calcined mpAu-SiO2 (SBET 488 m2 × g -1, pore size 3.5 nm). This material exhibits high activity and reusability for the solventless, aerobic oxidation of secondary alcohols to ketones.

langue originaleAnglais
Pages (de - à)4408-4413
Nombre de pages6
journalJournal of Materials Chemistry
Volume15
Numéro de publication41
Les DOIs
Etat de la publicationPublié - 7 nov. 2005

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