Hydrothermal Synthesis of ZnO–Doped Ceria Nanorods: Effect of ZnO Content on the Redox Properties and the CO Oxidation Performance

Applied Sciences

Michalis Konsolakis¹  Maria Lykaki¹  Sofia Stefa¹  Vasillios Binas²  VassilisN. Stathopoulos³  PavlosK. Pandis³ 

[1] Industrial, Energy and Environmental Systems Lab (IEESL), School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Crete, Greece;Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH–IESL), P.O. Box 1527, Vasilika Vouton, GR-71110 Heraklion, Greece;Laboratory of Chemistry and Materials Technology, General (Core) Department, National and Kapodistrian University of Athens, GR-34400 Psachna Campus, Evia, Greece;

关键词: CeO₂/ZnO mixed oxides;    zinc oxide;    ceria nanorods;    oxygen storage capacity;    CO oxidation;   

DOI  :  10.3390/app10217605

来源: DOAJ

【 摘 要 】

The rational design of highly efficient, noble metal–free metal oxides is one of the main research priorities in the area of catalysis. To this end, the fine tuning of ceria–based mixed oxides by means of aliovalent metal doping has currently received particular attention due to the peculiar metal–ceria synergistic interactions. Herein, we report on the synthesis, characterization and catalytic evaluation of ZnO–doped ceria nanorods (NR). In particular, a series of bare CeO₂ and ZnO oxides along with CeO₂/ZnO mixed oxides of different Zn/Ce atomic ratios (0.2, 0.4, 0.6) were prepared by the hydrothermal method. All prepared samples were characterized by X–ray diffraction (XRD), N₂ physisorption, temperature–programmed reduction (TPR), scanning electron microscopy with energy dispersive X–ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The CO oxidation reaction was employed as a probe reaction to gain insight into structure–property relationships. The results clearly showed the superiority of mixed oxides as compared to bare ones, which could be ascribed to a synergistic ZnO–CeO₂ interaction towards an improved reducibility and oxygen mobility. A close correlation between the catalytic activity and oxygen storage capacity (OSC) was disclosed. Comparison with relevant literature studies verifies the role of OSC as a key activity descriptor for reactions following a redox–type mechanism.

【 授权许可】

Unknown