Résumé
Reducing the amount of expensive noble metals without affecting the catalytic efficiency is a new trend in the development of novel heterogeneous catalysts. For instance, promising catalytic properties in dehydrogenation reactions, such as propane dehydrogenation reaction, are expected for the system Pt-M/Al2O3 prepared by dispersing ultra-small amounts of Pt on the surface of a host non-noble metal M (acting as promoter of Pt).Comparing the catalytic properties of Pt-M/Al2O3 needs the successful synthesis of the system M (= Cu, Sn or Ga)/Al2O3, which is already quite challenging due to the difficulty to reduce these non-noble metals and to obtain particle in the same size range. Thus, the poster will be dedicated to the first part of this project aiming to develop easy and cheap methods for the preparation of stable homogeneous promoter M0 nanoparticles of small size (5-10 nm) dispersed on the surface of γ-Al2O3. Conventional wet synthesis routes such as microsuspension in water and polyol are selected. The effect of the experimental parameters (ex: temperature, reducing agent, precursor, pH, capping agents, etc) will be reported. A special attention will be paid to the characterization of the chemical and structural properties of these materials, their surface accessibility and their stability under synthesis and catalytic test conditions.