Preparation and Investigation of Pd and Bimetallic Pd-Sn Nanocrystals on ?-Al2O3

One of the key factors for producing highly dispersed controlled nanoparticles is method used metal deposition. The decomposition metal-organic precursors a good deposition with very small sizes and narrow size distributions on surface various supports. preparation process Pd bimetallic Pd-Sn supported onto ?-Al2O3 considered. samples were prepared by diffusional co-impregnation support using organometallic Pd(acac)2 Sn(acac)2Cl2 precursors. To achieve formation surface, synthesized then subjected to thermal under Ar (to decompose bound while keeping formed small) followed an oxidation in O2 eliminate organic compounds remaining surface) reduction H2 reduce oxidized during previous step). A combination methods (ICP-OES, TPR-H2, XPS, TEM/EDX) was compare physical-chemical properties ?-Al2O3. three exhibit distribution majority between 3 5 nm. Local EDX measurements clearly showed that are expected chemical composition measured global ICP-OES. electronic Sn investigated particular state palladium tin after each step treatments (oxidation, reduction) XPS has been carried out. reducibility hydrogen temperature programmed (TPR-H2). TPR-H2 experiments have confirmed existence strong interactions Sn, as evidenced spillover (Pd-assisted oxygen precovered Sn). These results lead us propose mechanism nanoparticles.