Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1482995 | Journal of Non-Crystalline Solids | 2010 | 7 Pages |
Abstract
The effect of doping CuO-ZnO system with CeO2 on its surface and catalytic properties was investigated using nitrogen adsorption at â196 °C, EDX technique and catalysis of CO oxidation by O2 at 100-200 °C. Pure mixed solids were prepared by thermal decomposition of copper/zinc mixed hydroxides at 400 °C. The doped solids were obtained by impregnating a known mass of mixed hydroxides with calculated amount of cerium ammonium nitrate followed by drying then calcination at 400 °C. The dopant concentration was 1.5, 3.0 and 4.5 mol% CeO2. The results revealed that CeO2-doping modified the surface atomic Cu/Zn ratio of the system investigated and changed the crystallite size of both CuO and ZnO phases. The increase of the amount of dopant added changed the major phase present. This treatment decreased the specific surface area of doped solids. The doping process modified also the catalytic activity in a manner dependent on both mode of preparation and dopant concentration. However, CeO2-doping did not modify the mechanism of the catalytic reaction but changed the concentration of catalytically active sites involved in the catalyzed reactions.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Gamil A. El-Shobaky, Hassan M.A. Hassan, Naema S. Yehia, Abdel Rahman A.A. Badawy,