Heterogeneous catalysts containing metal particles are currently prepared by decomposition of metal salts or complexes or by impregnation of metal particles onto oxide supports such as alumina or silica. These standard procedures are easy to handle but they can lead to a broad distribution of particles size and to an heterogeneous distribution of particles within the oxide framework.

The aim of this work is to achieve a “one-pot” synthesis of mesoporous silica (silica) nanostructures around various metal nanoparticules colloidal solutions. This new methodology shoud lead to the synthesis of new heterogeneous catalysts as mesostructured materials with a three-dimensional network of nanometric monodispered pores channels (dp varying form 2 to 10 nm) and containing regularly distributed metallic nanoparticles within the framework.

To reach this goal, we developed a synthetic pathway requiring two steps :

1) The synthesis of colloidal solution of metal nanoparticles by reduction under hydrogen of a molecular metallic complex (Ru, Pt)  in presence of stabilising ligands.

2) The development of synthetic pathways to obtain mesostructured material containing metal nanoparticles using the sol-gel process via a templating routes.

The as-synthesized solution of metal nanoparticles and the nanoparticles containing materials were fully characterized by several techniques (nitrogen adsorption/desorption, T.E.M., hydrogen or oxygen adsorption, X Ray diffraction, elemental analysis…).

The materials were also compared to classical heterogeneous catalysts in term of stability (sintering of nanoparticles under various treatments) and catalytic performances (reaction of propene hydrogenation in a continuous tubular reactor).

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