Atomic layer deposition (ALD) was employed to synthesize supported Pt-Pd bimetallic particles in the 1 to 2 nm range. The metal loading and composition of the
supported Pt-Pd nanoparticles were controlled by varying the deposition temperature and by applying ALD metal oxide coatings to modify the support surface chemistry. Highresolution scanning transmission electron microscopy images showed monodispersed Pt-Pd nanoparticles on ALD Al2O3 - and TiO2 -modi?ed SiO2
gel. X-ray absorption spectroscopy revealed that the bimetallic nanoparticles have a stable Pt-core, Pd-shell nanostructure. Density functional theory calculations
revealed that the most stable surface con?guration for the Pt- Pd alloys in an H2
environment has a Pt-core, Pd-shell nanostructure. In comparison to their monometallic counterparts, the small Pt-Pd bimetallic core-shell nanoparticles exhibited higher activity in propane oxidative dehydrogenation as compared to their physical mixture.
Revised: October 12, 2012 |
Published: August 20, 2012
Citation
Lei Y., B. Liu, J. Lu, R.J. Lobo-Lapidus, T. Wu, H. Feng, and X. Xia, et al. 2012.Synthesis of Pt-Pd Core-Shell Nanostructures by Atomic Layer Deposition: Application in Propane Oxidative Dehydrogenation to Propylene.Chemistry of Materials 24, no. 18:3525-3533. doi:10.1021/cm300080w