Preparation and Characterization of Bimetallic Nanoparticles Ptx-Pd1-x Supported on Silica
Ptx-Pd(1-x) nanoparticles supported on amorphous silica (SiO2) were prepared by wetness impregnation techniques with choroplatinic acid (H2PtCl6) and palladium chloride (PdCl4) with different concentrations of Pt and Pd at about 1% in overall metallic weight. The purpose of this study was to evaluate the physical properties as physisorption (BET), X Ray Diffraction XRD, High Resolution Electron Microscopy HREM, Transmission Electron Microscopy TEM couple with XEDS energy dispersive X-ray spectrometry and chemical properties to determine the activity in cyclohexene reaction of these materials supported. Bimetallic nanoparticles are made of a single solid solution of Pt and Pd atoms, and the particles diameter of about 3-5 nm was estimated by HREM and Bright field image, the Pt-Pd nanoparticles were found mainly to have truncated cuboctahedral shape with fcc packing,. by using energy dispersive X-ray spectrometry (XEDS) and their values were found to be close to the stochiometric relative concentrations in weight of the metals in the precursor aqueous solution.
T. Chandra, K. Tsuzaki, M. Militzer and C. Ravindran
N. Castillo et al., "Preparation and Characterization of Bimetallic Nanoparticles Ptx-Pd1-x Supported on Silica", Advanced Materials Research, Vols. 15-17, pp. 559-563, 2007