Determining number of sites on ceria stabilizing single atoms via metal nanoparticle redispersion

doi:10.1016/S1872-2067(19)63504-7

Abstract

Abstract: Single atom catalysts have recently attracted interest due to their maximization of the utilization of expensive noble metals as well as their unique catalytic properties. Based on its surface atomic properties, CeO₂ is one of the most common supports for stabilizing single metal atoms. Many single atom catalysts are limited in their metal contents by the formation of metal nanoparticles once the catalyst support capacity for single atoms has been exceeded. Currently, there are no direct measurements to determine the capacity of a support to stabilize single atoms. In this work we develop a nanoparticle-based technique that allows for quantification of that capacity by redispersing Ru nanoparticles into single atoms and taking advantage of the different catalytic properties of Ru single atoms and nanoparticles in the CO₂ hydrogenation reaction. This method avoids complications in metal loading caused by counterions in incipient wetness impregnation and can eventually be applied to a variety of different metals. Results using this technique follow trends in oxygen vacancy concentration and surface oxygen content and show promise as a new method for quantifying support single atom stabilization capacity.

Key words: Ceria, Single-atom catalyst, Oxygen vacancies, CO₂ hydrogenation, Redispersion

Aisulu Aitbekova, Cody J. Wrasman, Andrew R. Riscoe, Larissa Y. Kunz, Matteo Cargnello. Determining number of sites on ceria stabilizing single atoms via metal nanoparticle redispersion[J]. Chinese Journal of Catalysis, 2020, 41(6): 998-1005.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63504-7

https://www.cjcatal.com/EN/Y2020/V41/I6/998

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