Abstract
Dodecanethiol-protected gold nanoparticles were deposited onto fumed SiO2 (Cab-O-Sil) via colloidal deposition. The catalyst was treated with a strongly oxidative KMnO4 or K2MnO4 solution. Low-temperature conversion in catalytic CO oxidation increased dramatically following the oxidative treatment and subsequent thermal activation at 300 °C to burn off residual organic species. On the other hand, the treatment with Fenton's reagent did not lead to any positive effect. The influences of the average sizes of pre-synthesized gold particles (1.8, 2.1, 3.9, 9.9 nm) and the choice of different supports (SiO2, TiO 2, C) were investigated, and relevant characterization using TG/DTG, XRD, TEM, EDX, and HAADF was conducted. The catalyst stability as a function of time on stream was also surveyed. This work establishes the beneficial effect of treating dodecanethiol-capped gold catalysts by KMnO4 or K 2MnO4.
| Original language | English |
|---|---|
| Pages (from-to) | 209-221 |
| Number of pages | 13 |
| Journal | Catalysis Letters |
| Volume | 136 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jun 2010 |
Funding
Acknowledgements Research sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. This research was also supported by the appointment for H.F. Yin to the ORNL Research Associates Program, administered by Oak Ridge Associated Universities. The electron microscopy experiments were carried out at the Oak Ridge National Laboratory SHaRE User Facility, which is supported by the Division of Scientific User Facilities, DOE Office of Science, Basic Energy Sciences.
Keywords
- Au/C
- Au/SiO
- Au/TiO
- Fenton's reagent
- Gold nanoparticles
- KMnO
- KMnO