Citation: Yu Aung May, Wei-Wei Wang, Han Yan, Shuai Wei, Chun-Jiang Jia. Insights into facet-dependent reactivity of CuO-CeO₂ nanocubes and nanorods as catalysts for CO oxidation reaction[J]. Chinese Journal of Catalysis, ;2020, 41(6): 1017-1027. doi: 10.1016/S1872-2067(20)63533-1 shu

Insights into facet-dependent reactivity of CuO-CeO₂ nanocubes and nanorods as catalysts for CO oxidation reaction

Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China

Received Date: 30 October 2019
Revised Date: 17 December 2019

Fund Project: This work was financially supported by the Excellent Young Scientists Fund from National Natural Science Foundation of China (NSFC) (21622106), other projects from the NSFC (grant no. 21805167 and 21771117), the Outstanding Scholar Fund from the Science Foundation of Shandong Province of China (JQ201703), the Doctoral Fund (ZR2018BB010) from the Science Foundation of Shandong Province of China, the Taishan Scholar Project of Shandong Province of China, and the Future Program for Young Scholar of Shandong University. We thank the Center of Structural Characterizations and Property Measurements at Shandong University for help with sample characterizations.

Copper-ceria (CuO-CeO₂) catalysts have been known to be very effective for the oxidation of CO, and their chemical behavior has been extensively studied during the last decades. However, the effect of different CeO₂ crystal surfaces on the catalytic activity of CuO-CeO₂ for the oxidation of CO is still unclear and should be further elucidated. In this study, we deposited 1 wt% Cu on mostly {100}-exposed CeO₂ nanocubes (1CuCe NC) and mostly {110}-exposed CeO₂ nanorods (1CuCe NR), respectively. Both 1CuCe NC and 1CuCe NR have been used as catalysts for the oxidation of CO and achieved 100% and 50% CO conversion at 130℃, respectively. The differences in the catalytic activity of 1CuCe NC and 1CuCe NR were analyzed using temperature-programmed reduction of H₂ and temperature-programmed desorption of CO techniques. The results confirmed the excellent reducibility of the 1CuCe NC catalyst, which was attributed to the weak interactions between Cu and the CeO₂ support. Moreover, in situ diffuse reflectance infrared Fourier-transform spectroscopy studies indicated that the {100} planes of 1CuCe NC facilitated the generation of active Cu(I)sites, which resulted in the formation of highly reactive Cu(I)-CO species during the oxidation of CO. Both the excellent redox properties and effective CO adsorption capacity of the 1CuCe NC catalyst increased its catalytic reactivity.
- Copper-ceria catalyst,
- Crystal facets,
- CO oxidation,
- Redox property,
- Active site
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Insights into facet-dependent reactivity of CuO-CeO2 nanocubes and nanorods as catalysts for CO oxidation reaction

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通讯作者: 陈斌, bchen63@163.com

Insights into facet-dependent reactivity of CuO-CeO₂ nanocubes and nanorods as catalysts for CO oxidation reaction