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Kasala, Prabhakar Reddy
나노물질 및 화학반응 연구단
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Cu oxide deposited on shape-controlled ceria nanocrystals for CO oxidation: influence of interface-driven oxidation states on catalytic activity

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Title
Cu oxide deposited on shape-controlled ceria nanocrystals for CO oxidation: influence of interface-driven oxidation states on catalytic activity
Author(s)
Kasala Prabhakar Reddy; Choi, Hanseul; Kim, Daeho; Ryong Ryoo; Jeong Young Park
Publication Date
2021-09-21
Journal
CATALYSIS SCIENCE & TECHNOLOGY, v.11, no.18, pp.6134 - 6142
Publisher
ROYAL SOC CHEMISTRY
Abstract
The design of a catalyst with a highly active and stable oxidation state is of great interest in heterogeneous catalysis. Herein, the relationship between catalytic activity and oxidation state on Cu deposited on CeO2 nanocrystals has been elucidated by varying the shape of the ceria (CeO2) support. Three types of CeO2 nanocrystals were prepared for supporting Cu oxide (CuOx): CeO2 nanocubes (NCs), nanorods (NRs) and nanospheres (NSs). The Cu oxide deposited on CeO2NC has shown higher CO oxidation activity at a lower temperature than that over the NR and NS surfaces. Furthermore, characterization of structure and oxidation states revealed that the stable Cu1+ oxidation state on the surface of CuOx/CeO2NC formed at a low loading of copper (similar to 1.5 wt%), which acts as an active site for the CO oxidation. In contrast to the high surface area and redox properties, a systematic catalytic activity trend was observed among the catalysts with the extent of the Cu1+ oxidation state. We demonstrate that the polar (100) surface facets of NCs contribute significantly to the formation of surface hydroxyl groups, which are required for the selective and stable Cu1+ state at a low loading.
URI
https://pr.ibs.re.kr/handle/8788114/10404
DOI
10.1039/d1cy01269j
ISSN
2044-4753
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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