Platinum (Pt) Palladium (Pd) nanoparticles supported on silicon dioxide  (SiO₂) were prepared by wetness impregnation techniques at same concentrations of Pt(0.5) and Pd(0.5) ≈ 1 metallic wt %. The particle size distribution were measured as function of reduction temperature,  in the  range of 200 ºC - 400 ºC to evaluate the nucleation phenomena. In addition morphology and cristallinity under various reactor temperature were investigated by physisorption Brunauer-Emmett-Teller-(BET), X-Ray Diffraction (XRD), High Resolution Electron Microscopy (HREM) and Transmission Electron Microscopy (TEM). In this work, we observed the distribution of Platinum and Palladium in nanoparticles.  By XRD  we found Pt-Pd bimetallic nanoparticles with ffc structure and particles diameter in the last stage was  about 4.2 nm was estimated by HREM and Bright field image allowed to determine that Pt-Pd nanoparticles were found mainly to have cube octahedral shape.

These results clearly demonstrated that particle size distribution is affected by chemical rate as a function of temperature.  At high temperature, the particle size increased. The reaction temperature greatly affected the crystallinity of nanoparticles. It was found that particle generation process consist of the nuclei control, in which the concentration of nuclei is low, (200ºC) the second is the nucleation surface reaction which the concentration of nuclei is enough large(300ºC), and the last (350ºC-400ºC) when the chemical reaction are complete. In the last stage Pt_x-Pd_(1-x) Bimetallic nanoparticles presented cubo-octahedral shape.

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