Journal
JOURNAL OF CATALYSIS
Volume 405, Issue -, Pages 333-345Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2021.12.015
Keywords
CeO2-CuO/Cu2O; Structure sensitivity; Surface restructuring; CO oxidation; Active structure
Categories
Funding
- Natural Science Foundation of Zhejiang Province [LQ20B030007]
- National Natural Science Foundation of China [2210020901, 21773212, 22072137]
- fund of the State Key Laboratory of Catalysis in DICP [N-20-07]
- Zhejiang Normal University [2021ZS0602]
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University
Ask authors/readers for more resources
By studying the CO oxidation catalyzed by CeO2-CuO/Cu2O nanocomposites with different CuO structures, it was found that the CuO-CeO2 interfaces in the CeO2-CuO/c-Cu2O (cubes) nanocomposites exhibit higher intrinsic activity, indicating that the active oxygen species originates from CuO. An active 13.2% CeO2-CuO/c-Cu2O(s) catalyst for CO oxidation was achieved on fine Cu2O cubes, possessing a high density of active sites.
Several CeO2-CuO/Cu2O nanocomposites with different CuO structures were used to identify the structure sensitivity of CuO in the CeO2-CuO/Cu2O catalyzed CO oxidation. The CO oxidation catalyzed by various CuO-CeO2 interfacial sites involves a typical Mars-van Krevelen mechanism, in which the CuO-CeO2 interfaces in the CeO2-CuO/c-Cu2O (cubes) nanocomposites are more intrinsically active, exhibiting ca. 15 kJ mol(-1) lower activation energy than those in the CeO2-CuO/o-Cu2O (octahedra) and CeO2-CuO/d-Cu2O (rhombic dodecahedra) nanocomposites at CeO2 loadings no less than 0.75 wt%. The higher activity is relevant to lower coordinated oxygen ions on CuO/c-Cu2O surface and thus better CO reactivity for the CeO2-CuO/c-Cu2O nanocomposites, which therefore indicates that the active oxygen species on CuO-CeO2 interface should come from CuO rather than CeO2. Moreover, a highly active 13.2 %CeO2-CuO/c-Cu2O(s) catalyst for CO oxidation is realized on fine Cu2O cubes, which thus has high density of active sites. (C) 2021 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available