Catalysis Letters

, Volume 127, Issue 3, pp 429–436

Gold/Platinum Bimetallic Core/Shell Nanoparticles Stabilized by a Fréchet-Type Dendrimer: Preparation and Catalytic Hydrogenations of Phenylaldehydes and Nitrobenzenes

Authors

  • Wei Zhang
    • College of Chemistry and Chemical EngineeringSuzhou University
    • School of Chemical and Materials EngineeringJiangnan University
  • Lei Li
    • College of Chemistry and Chemical EngineeringSuzhou University
  • Yukou Du
    • College of Chemistry and Chemical EngineeringSuzhou University
  • Xiaomei Wang
    • College of Chemistry and Chemical EngineeringSuzhou University
    • College of Chemistry and Chemical EngineeringSuzhou University
Article

DOI: 10.1007/s10562-008-9725-9

Cite this article as:
Zhang, W., Li, L., Du, Y. et al. Catal Lett (2009) 127: 429. doi:10.1007/s10562-008-9725-9

Abstract

Au/Pt bimetallic core/shell nanoparticles that were stabilized by polyaryl ether trisacetic acid ammonium chloride dendrons (G3NACl) were synthesized and used as catalysts for the hydrogenation of 3-phenoxybenzaldehyde to 3-phenoxyphenyl methanol and nitrobenzenes to anilines. Transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible absorption spectroscopy revealed that Au/Pt bimetallic nanoparticles with a 6-nm Au core and average overall diameters of 9.0 ± 2.4 nm, 10.4 ± 2.8 nm, and 13.0 ± 3.2 nm for Au75Pt25@G3NACl, Au50Pt50@G3NACl, and Au25Pt75@G3NACl, respectively, had formed. Au/Pt bimetallic nanoparticles showed higher catalytic activity for the hydrogenation of nitrotoluenes to anilines and 3-phenoxybenzaldehyde to 3-phenoxyphenyl methanol as compared to monometallic platinum nanoparticles and physical mixtures of monometallic Pt and Au nanoparticles. The higher activity of the Au/Pt bimetallic nanoparticles may be attributed to the fact that the gold core attracts electrons from platinum. The electron-deficient platinum shell may favor the adsorption of the substrate with polar carboxyl groups.

Keywords

Au/Pt bimetallic core/shell nanoparticlesFréchet-type dendrimers3-Phenoxy benzaldehydeNitrobenzenesCatalytic hydrogenation

Copyright information

© Springer Science+Business Media, LLC 2008