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

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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.

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Acknowledgment

Authors thank the National Natural Science Foundation of China (20673075, 20553001, and 90607024) for financial support and the reviewers of the manuscript for the valuable suggestions.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Suzhou University, Suzhou, 215123, China

    Wei Zhang, Lei Li, Yukou Du, Xiaomei Wang & Ping Yang

  2. School of Chemical and Materials Engineering, Jiangnan University, Wuxi, 214122, China

    Wei Zhang

Authors
  1. Wei Zhang
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  2. Lei Li
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  3. Yukou Du
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  4. Xiaomei Wang
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  5. Ping Yang
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Correspondence to Ping Yang.

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Zhang, W., Li, L., Du, Y. et al. Gold/Platinum Bimetallic Core/Shell Nanoparticles Stabilized by a Fréchet-Type Dendrimer: Preparation and Catalytic Hydrogenations of Phenylaldehydes and Nitrobenzenes. Catal Lett 127, 429–436 (2009). https://doi.org/10.1007/s10562-008-9725-9

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  • DOI: https://doi.org/10.1007/s10562-008-9725-9

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