Abstract
Au catalysts supported on mesoporous silica and titania supports were synthesized and tested for the oxidation of CO. Two approaches were used to prepare the silica-supported catalysts utilizing complexing triamine ligands which resulted in mesoporous silica with wormhole and hexagonal structures. The use of triamine ligands is the key for the formation of uniformly sized 2-3 nm Au nanoparticles in the silica pores. On mesoporous titania, high gold dispersions were obtained without the need of a functional ligand. Au supported on titania exhibited a much higher activity for CO oxidation, even though the Au particle sizes were essentially identical on the titania and the wormhole silica supports. The results suggest that the presence of 2-3 nm particle size alone is not sufficient to achieve high activity in CO oxidation. Instead, the support may influence the activity through other possible ways including stabilization of active sub-nanometer particles, formation of active oxygen-containing reactant intermediates (such as hydroxyls or O 2 -), or stabilization of optimal Au structures.
Original language | English |
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Pages (from-to) | 99-106 |
Number of pages | 8 |
Journal | Catalysis Letters |
Volume | 95 |
Issue number | 3-4 |
DOIs | |
State | Published - Jun 2004 |
Funding
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.
Funders | Funder number |
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UT-Battelle | |
U.S. Department of Energy | DE-AC05-00OR22725 |
Basic Energy Sciences | |
Oak Ridge National Laboratory | |
Chemical Sciences, Geosciences, and Biosciences Division |
Keywords
- Au
- CO oxidation
- FTIR
- Mesoporous oxides
- Silica
- TEM
- Titania