Journal
CHINESE JOURNAL OF CATALYSIS
Volume 41, Issue 6, Pages 1017-1027Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(20)63533-1
Keywords
Copper-ceria catalyst; Crystal facets; CO oxidation; Redox property; Active site
Funding
- Excellent Young Scientists Fund from National Natural Science Foundation of China (NSFC) [21622106]
- NSFC [21805167, 21771117]
- Science Foundation of Shandong Province of China [JQ201703, ZR2018BB010]
- Taishan Scholar Project of Shandong Province of China
- Future Program for Young Scholar of Shandong University
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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 degrees C, respectively. The differences in the catalytic activity of 1CuCe NC and 1CuCe NR were analyzed using temperature-programmed reduction of H-2 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. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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