Abstract
Gold was supported on commercial ZnO powders (P) and homemade ZnO nanowires (NWs) by a modified deposition-precipitation method. X-ray diffraction and transmission electron microscopy investigation indicated that the size of the Au nanoparticles (NPs) depended strongly on the calcination temperature. The Au NPs were highly dispersed (400°C. Such unique anchoring mechanism accounts for the much better experimentally observed sintering resistance. X-ray photoelectron spectra showed that Au existed as both metallic Au0 and Auδ+ species in all the synthesized catalysts with or without calcination treatment; the ratios of Auδ+/Au0, however, varied, depending on the treatment conditions. Catalytic tests showed that the activity for CO oxidation strongly depended on the size of the Au NPs. After calcination at 600°C, the specific rate for CO oxidation at room temperature decreased about 30 times on Au/ZnO P but only about 4 times on Au/ZnO NW. Stability tests demonstrated that the Au/ZnO NW catalysts had better stability for CO oxidation.
Original language | English (US) |
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Journal | Journal of Energy Chemistry |
DOIs | |
State | Accepted/In press - Dec 18 2015 |
Keywords
- CO oxidation
- Epitaxy
- Gold
- Nanowires
- Sintering
- Stability
- ZnO
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Energy (miscellaneous)
- Fuel Technology
- Electrochemistry