Cu oxide deposited on shape-controlled ceria nanocrystals for CO oxidation: influence of interface-driven oxidation states on catalytic activity

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 CeO 2 nanocrystals has been elucidated by varying the shape of the ceria (CeO 2 ) suppo...

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Veröffentlicht in:Catalysis science & technology 2021-09, Vol.11 (18), p.6134-6142
Hauptverfasser: Prabhakar Reddy, Kasala, Choi, Hanseul, Kim, Daeho, Ryoo, Ryong, Park, Jeong Young
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Sprache:eng
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Zusammenfassung: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 CeO 2 nanocrystals has been elucidated by varying the shape of the ceria (CeO 2 ) support. Three types of CeO 2 nanocrystals were prepared for supporting Cu oxide (CuO x ): CeO 2 nanocubes (NCs), nanorods (NRs) and nanospheres (NSs). The Cu oxide deposited on CeO 2 NC 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 Cu 1+ oxidation state on the surface of CuO x /CeO 2 NC formed at a low loading of copper (∼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 Cu 1+ 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 Cu 1+ state at a low loading. The polar CeO 2 (100) surface facets contribute considerably to the formation of surface hydroxyl groups, which are necessary for selective, stable Cu 1+ state loading and enhancement of CO oxidation activity.
ISSN:2044-4753
2044-4761
DOI:10.1039/d1cy01269j