• DOI:10.1021/CS400701J
• Corpus ID: 102214006

Establishing a Au Nanoparticle Size Effect in the Oxidation of Cyclohexene Using Gradually Changing Au Catalysts

@article{Donoeva2013EstablishingAA,
  title={Establishing a Au Nanoparticle Size Effect in the Oxidation of Cyclohexene Using Gradually Changing Au Catalysts},
  author={Baira Donoeva and Daniil S. Ovoshchnikov and Vladimir B. Golovko},
  journal={ACS Catalysis},
  year={2013},
  volume={3},
  pages={2986-2991}
}

• B. Donoeva, D. Ovoshchnikov, V. Golovko
• Published 20 November 2013
• Chemistry
• ACS Catalysis

The effect of the size of gold nanoparticles on their catalytic activity in aerobic oxidation of cyclohexene was established using supported gold nanoparticles that gradually undergo a change in size during the catalytic reaction. Two triphenylphosphine-stabilized clusters, Au9(PPh3)8(NO3)3 and Au101(PPh3)21Cl5, were synthesized and deposited on SiO2. The clusters did not retain their structure during the catalytic reaction; larger particles with mean diameters of ∼5–10 nm gradually formed. By combining kinetic experiments with the monitoring of catalyst transformations using transmission electron microscopy, diffuse-reflectance ultraviolet–visible spectroscopy, and X-ray photoelectron spectroscopy, we showed that catalytic activity appeared only after >2 nm Au0 particles had formed, while intact clusters and phosphine-free <2 nm particles were inactive in cyclohexene oxidation under the studied conditions.