| Spherical Silica Xerogel: An Enhancement the Activity of Gold Nanoparticles |
| Paper ID : 1361-ICNS |
| Authors: |
|
Babak Karimi1, Mina Ghahremani *2, Mario Pagliaro3 1Department of Chemistry, IASBS 2Department of chemistry, IASBS 3Istituto per lo Studio dei Materiali Nanostrutturati, CNR |
| Abstract: |
| Abstract: Fully alkylated silica microparticles of spherical morphology has been exhibited ideally suited nature to host metal (gold) nanoparticles. The organically regular structure of matrix performed a reducible support to deposit electron rich Au nanocrystallites by impregnation-deposition within the inner mesoporosity of spherical silica (Sph. ORMOSIL) through colloidal deposition. The resulting catalytic material is very stable and its performance is superior in comparison with both Au nanoparticles deposited over nonspherical silica support and gold nanoparticles entrapped organosilica (SiliaCat Au) analogues. This study shows that the straightforward deposition-precipitation method applied to an as-synthesized ORMOSIL spherical matrix affords a catalyst in which Au0 and Au1+ species are clearly detected by XPS on the surface of a catalyst suitable to selectively convert benzyl alcohol into valued benzaldehyde and benzyl benzoate. Furthermore, That is enough the carry out the oxidative dehydrogenation reaction of benzyl alcohol over a stable spherical gold catalyst to obtain high yields of both products under solvent-free conditions which are ideal from the green chemistry viewpoint. Since mesoporous ORMOSIL catalysts, are ideally suited for reactions under flow, higher conversion and yields are expected by prolonging the reaction time and by transferring the reaction from batch to flow conditions. |
| Keywords: |
| Gold nanoparticles, Organosilica, Sol–gel, Sphericity |
| Status : Abstract Accepted (Poster Presentation) |