Abstract
In this study, the Ag/CeO 2 catalysts with three different morphologies of ceria nanocubes (CeO 2 -c), nanorods (CeO 2 -r) and nano-octahedra (CeO 2 -o) as supports were prepared by wet impregnation. Various characterizations such as XRD, BET, TEM/HRTEM, HAADF-STEM, XPS and H 2 -TPR were conducted, and a four step catalytic transformation was accordingly proposed. It was found that Ag/CeO 2 -c showed much more metallic Ag, active oxygen species and higher reducibility than those of Ag/CeO 2 -r and Ag/CeO 2 -o mainly due to the morphology effect. Ag/CeO 2 and CeO 2 catalysts were evaluated in the oxidation of ethyl acetate, and their catalytic activities were in the sequence of Ag/CeO 2 -c > Ag/CeO 2 -r > CeO 2 -r > CeO 2 -c > Ag/CeO 2 -o > CeO 2 -o. Besides, in-situ FTIR results revealed that the organic species on the catalyst surface were mainly acetates and adsorbed ethyl acetate for Ag/CeO 2 -c and CeO 2 -c, respectively, suggesting that addition of Ag promoted the complete oxidation of ethyl acetate.
| Original language | English |
|---|---|
| Pages (from-to) | 32-38 |
| Number of pages | 7 |
| Journal | Materials Chemistry and Physics |
| Volume | 229 |
| DOIs | |
| State | Published - 1 May 2019 |
Keywords
- Catalytic oxidation
- CeO
- Ethyl acetate
- Morphology
- Silver
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