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Chemical Research in Chinese Universities

, Volume 35, Issue 5, pp 854–859 | Cite as

In situ Deposition of ‘Naked’ Gold Nanoparticles Supported on Silica Spheres as Recyclable Catalysts in Styrene Epoxidation

  • Qihui Shen
  • Xinyu Zhou
  • Yang Lyu
  • Miao Li
  • Yan LiuEmail author
Article
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Abstract

The rational designs of particle size, morphology and surface states of the Au nanoparticles(AuNPs) are crucial for Au nanocatalyst. We herein report a method to synthesize the silica microspheres supported AuNPs(ca. 1 nm) and their application in controlling the reaction conversion and selectivity in styrene epoxidation. Surfactant-free AuNPs deposited on silica microspheres were in situ fabricated with aid of the Ag nanoparticles (AgNPs) as sacrificial template by galvanic replacement reaction, leading to AuNPs/SiO2 catalyst directly without any post-treatment to expose crystal facets. A high conversion of 46.7% and selectivity of 91.7% to styrene oxide was achieved with H2O2 as oxidant in ethanol. The solid catalyst could be reused at least 10 reaction cycles without significant decrease in activity and selectivity. This study not only supplies an active, recoverable catalyst for styrene oxidation with green oxidant and solvent, but also demonstrates that the silica microspheres functionalized with thiol groups have a superior ability in stabilizing noble metal nanoparticles even without any surfactant.

Keywords

Au nanoparticles STyrene epoxidation Galvanic replacement 

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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2019

Authors and Affiliations

  • Qihui Shen
    • 1
  • Xinyu Zhou
    • 1
  • Yang Lyu
    • 1
  • Miao Li
    • 1
  • Yan Liu
    • 1
    Email author
  1. 1.Department of Chemistry and Pharmaceutical EngineeringJilin Institute of Chemical TechnologyJilinP. R. China

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