Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
147346 | Chemical Engineering Journal | 2014 | 10 Pages |
•Co, Cu, and Ni-doped and codoped CeO2 catalysts were prepared.•CO oxidation was tested over as-prepared and thermal-treated the catalysts.•Cu-contained CeO2 commonly showed higher catalytic activity after thermal treatment in N2 atmosphere.•Charge balance of doped metals appears to play a major role.
We doped (M) and codoped (MM’) Co, Cu, and Ni into CeO2 support, and tested their gas-phase CO oxidation performance by temperature-programmed reaction mass spectrometry for the as-prepared, thermal H2- and N2-treated samples. Additionally, fundamental characteristics of doped CeO2 were revealed by transmission electron microscopy, optical microscopy, X-ray diffraction crystallography, UV–visible absorption, Brunauer–Emmett–Teller (BET) surface area measurements, and temperature-programmed reduction experiments. The CO oxidation performance was greatly improved upon metal-doping and thermal pre-treatment in H2 and N2 condition. It was found that Cu-contained samples showed higher CO performance while Ni, Co and CoNi-doped samples showed poor performances. The T10% (the temperature at 10% CO conversion) was lowered by 140 °C upon Cu-doping. Upon N2 (or H2-thermal treatment), the T10% was lowered by 80 and 110 °C for Cu-doped and undoped CeO2 catalyst, respectively. Overall, this study provides deeper information of surface treatment effects useful to development of efficient catalysts.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide