Tracking the formation, fate and consequence for catalytic activity of Pt single sites on CeO2

Nature Catalysis Journal

Platinum single sites are highly attractive due to their high atom economy and can be generated on CeO₂ by an oxidative high-temperature treatment. However, their location and activity are strongly debated. Furthermore, reaction-driven structural dynamics have not been addressed so far. In this study, we were able to evidence platinum-induced CeO₂ surface restructuring, locate platinum single sites on CeO₂ and track the variation of the active state under reaction conditions using a complementary approach of density functional theory calculations, in situ infrared spectroscopy, operando high-energy-resolution fluorescence detected X-ray absorption spectroscopy and catalytic CO (as well as C₃H₆ and CH₄) oxidation. We found that the onset of CO oxidation is linked to the migration of platinum single sites from four-fold hollow sites to form small clusters containing a few platinum atoms. This demonstrates that operando studies on single sites are essential to assess their fate and the resulting catalytic properties.

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Tracking the formation, fate and consequence for catalytic activity of Pt single sites on CeO₂

Florian Maurer ¹, Jelena Jelic ², Junjun Wang ³, Andreas Gänzler ¹, Paolo Dolcet ¹, Christof Wöll ³, Yuemin Wang ³, Felix Studt ^1,2, Maria Casapu ¹ and Jan-Dierk Grunwaldt ^1,2

1 Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

2 Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

3 Institute for Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

For more information about Chemspeed solutions:

FLEX ISYNTH

ISYNTH CATIMPREG

AUTOPLANT PRECIP

AUTOPLANT ZEO

Nature Catalysis Journal

https://doi.org/10.1038/s41929-020-00508-7

Nature Catalysis | VOL 3 | October 2020 | 824–833 | www.nature.com/natcatal

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