Citation: Yuxian Gao, Zhenhua Zhang, Zhaorui Li, Weixin Huang. Understanding morphology-dependent CuO_x-CeO₂ interactions from the very beginning[J]. Chinese Journal of Catalysis, ;2020, 41(6): 1006-1016. doi: S1872-2067(19)63503-5 shu

Understanding morphology-dependent CuO_x-CeO₂ interactions from the very beginning

a Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, Anhui, China;
b Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China

Received Date: 20 October 2019
Revised Date: 29 November 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21525313, 21761132005), the Chinese academy of Sciences, and the Changjiang Scholars Program of Ministry of Education of China.

Elucidation of the CuO_x-CeO₂ interactions is of great interest and importance in understanding complex CuO_x-CeO₂ interfacial catalysis in various reactions. In the present work, we have investigated structures and catalytic activity in CO oxidation of CuO_x species on CeO₂ rods, cubes and polyhedra predominantly exposing {110}+{100}, {100} and {111} facets by the incipient wetness impregnation method with the lowest Cu loading of 0.025%. The structural evolution of CuO_x species was found to depend on both the Cu loading and the CeO₂ morphology. As the Cu loading increases, CuO_x species are deposited preferentially on the surface defect of CeO₂ and then aggregate and grow, accompanied by the formation of isolated Cu ions, CuO_x clusters strongly/weakly interacting with the CeO₂, highly dispersed CuO nanoparticles, and large CuO nanoparticles. The isolated Cu⁺ species and CuO_x clusters weakly interacting with the CeO₂ were observed mainly on the O-terminated CeO₂{100} facets. Meanwhile, more Cu(I) species are stabilized during CO reduction processes in CuO_x/c-CeO₂ catalysts than in CuO_x/r-CeO₂ and CuO_x/p-CeO₂ catalysts. The catalytic activities of various CuO_x/CeO₂ catalysts in CO oxidation vary with both the CuO_x species and the CeO₂ morphology. These results comprehensively elucidate the CuO_x-CeO₂ interactions and exemplify their morphology-dependence.
- CeO₂ nanocrystals,
- CuO_x/CeO₂ catalysts,
- Metal-support interactions,
- CO oxidation,
- Morphology effect
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Understanding morphology-dependent CuOx-CeO2 interactions from the very beginning

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通讯作者: 陈斌, bchen63@163.com

Understanding morphology-dependent CuO_x-CeO₂ interactions from the very beginning