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 |
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Format: | Artikel |
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. |
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ISSN: | 2044-4753 2044-4761 |
DOI: | 10.1039/d1cy01269j |