Preparation and characterization of Cu-doped mesoporous CeO₂ for CO oxidation

TIAN Jun-jie(田俊杰)^{1, 2, 3}, NA Wei(纳薇)^{1, 2}, WANG Hua(王华)^{1, 2}, GAO Wen-gui(高文桂)^{1, 2}

(1. Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China;
2. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in
Yunnan Province, Kunming 650093, China;
3. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China)

Abstract:Mesoporous CeO₂ was first synthesized by hydrothermal method, and then used to synthesize different contents of CuO)_x/CeO₂ (x: molar ratio of Cu to Ce) by deposition-precipitation method. These materials were characterized by X-ray diffraction (XRD), N₂ adsorption and desorption, H₂ temperature programmed reduction (H₂-TPR) and O₂ temperature programmed desorption (O₂-TPD) to study the crystal structure, surface area, and the mechanism of CO oxidation. The results show that, on XRD patterns, no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%. The BET surface area decreases noticeably with the increase of Cu content. Compared with other samples, the better reducibility and activity oxygen species of (CuO)_10%/CeO₂ coincide with its better catalytic activity.

Key words:mesoporous CeO₂; catalytic activity; CuO/CeO₂; CO oxidation