Effect of La₂O₃ on Microstructure and Catalytic Performance of CuO/CeO₂ Catalyst in Water-Gas Shift Reaction

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• 作者：Xing FANG ; Chongqi CHEN ; Xingyi LIN ; ^{linxingyi@fzu.edu.cn} ; Yusheng SHE ; Yingying ZHAN ; Qi ZHENG
• 关键词：copper oxide ; ceria ; lanthanum oxide ; water-gas shift reaction ; oxygen vacancy ; Raman spectroscopy
• 刊名：Chinese Journal of Catalysis
• 出版年：2012
• 期刊代码：3_18722067
• 类别：ce
• 出版时间：February-March, 2012
• 卷：33
• 期：2-3
• 页码：425-431
• 文件大小：221 K

摘要

The water-gas shift reaction was used to evaluate a series of La₂O₃ modified CuO/CeO₂ catalysts that were prepared by a parallel co-precipitation method. The catalytic activity and thermal stability improved significantly upon the introduction of La₂O₃, and CuO/CeO₂-La₂O₃ (2 wt%) gave the highest activity and had the best thermal stability. The microstructure of the as-prepared CuO/CeO₂-La₂O₃ catalysts and/or the CeO₂-La₂O₃ supports was characterized by X-ray diffraction, N₂ physisorption, Raman spectroscopy, and temperature-programmed reduction. The results indicate that larger specific surface areas and smaller crystal sizes of CuO and CeO₂ result in improved catalytic performance for the as-prepared catalysts. Moreover, the incorporation of La³⁺ into the ceria lattice promotes the generation of oxygen vacancies leading to a higher number of moderate copper oxides that interact with surface oxygen vacancies on the surface of the ceria. This enhances the activity and thermal stability of the CuO/CeO₂ catalyst.