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Activation of Dodecanethiol-Capped Gold Catalysts for CO Oxidation by Treatment with KMnO4 or K2MnO4.
- Source :
-
Catalysis Letters . Jun2010, Vol. 136 Issue 3/4, p209-221. 13p. 4 Black and White Photographs, 2 Diagrams, 3 Charts, 7 Graphs. - Publication Year :
- 2010
-
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, TiO2, 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 K2MnO4. Dodecanethiol-capped gold nanoparticles were deposited onto SiO2, TiO2, or carbon support, and the resulting catalysts were treated by aqueous KMnO4 or K2MnO4 followed by treatment in O2–He at 300 °C. The catalytic activity in low-temperature CO oxidation was increased due to the creation of Au–MnO x interfaces.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]
- Subjects :
- *GOLD
*NANOPARTICLES
*CHEMICAL inhibitors
*OXIDATION
*CATALYSTS
Subjects
Details
- Language :
- English
- ISSN :
- 1011372X
- Volume :
- 136
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 50377262
- Full Text :
- https://doi.org/10.1007/s10562-010-0316-1