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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 SiO<subscript>2</subscript> (Cab-O-Sil) via colloidal deposition. The catalyst was treated with a strongly oxidative KMnO<subscript>4</subscript> or K<subscript>2</subscript>MnO<subscript>4</subscript> 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 (SiO<subscript>2</subscript>, TiO<subscript>2</subscript>, 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 KMnO<subscript>4</subscript> or K<subscript>2</subscript>MnO<subscript>4</subscript>. Dodecanethiol-capped gold nanoparticles were deposited onto SiO<subscript>2</subscript>, TiO<subscript>2</subscript>, or carbon support, and the resulting catalysts were treated by aqueous KMnO<subscript>4</subscript> or K<subscript>2</subscript>MnO<subscript>4</subscript> followed by treatment in O<subscript>2</subscript>–He at 300 °C. The catalytic activity in low-temperature CO oxidation was increased due to the creation of Au–MnO<subscript> x</subscript> 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 :
- Complementary Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 50377262
- Full Text :
- https://doi.org/10.1007/s10562-010-0316-1