Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support 
Interaction between Platinum Nanoparticles and Nanosized Ceria

Gatla, Suresh; Aubert, Daniel; Agostini, Giovanni; Mathon, Olivier; Pascarelli, Sakura; Lunkenbein, Thomas; Willinger, Marc Georg; Kaper, Helena

doi:10.1021/acscatal.6b00677

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Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support Interaction between Platinum Nanoparticles and Nanosized Ceria

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Lunkenbein, Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Willinger, Marc Georg
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Supporting information_ACS catalysis_b.pdf
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Citation

Gatla, S., Aubert, D., Agostini, G., Mathon, O., Pascarelli, S., Lunkenbein, T., et al. (2016). Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support Interaction between Platinum Nanoparticles and Nanosized Ceria. ACS Catalysis, 6(9), 6151-6155. doi:10.1021/acscatal.6b00677.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-61A5-E

Abstract

Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal–support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt–O distance of 2.1 Å, which is significantly longer than the Pt–O distance in PtO₂ (2.0 Å). This elongated Pt–O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species–support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.