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Synergy between Metallic and Oxidized Pt Sites Unravelled during Room Temperature CO Oxidation on Pt/Ceria

Abstract : Pt-based materials are widely used as heterogeneous catalysts, in particular for pollutant removal applications. The nature of the active Pt phase responsible for CO oxidation has long been investigated with a view at designing more efficient formulations. The state of Pt has often been proposed to differ depending on experimental conditions, e.g. metallic Pt poisoned with CO being present at lower temperature before light-off, while an oxidized Pt surface prevails above light-off temperature. In stark contrast with all previous reports, we show here that both metallic and oxidized Pt are present in similar proportions under reaction conditions at the surface of ca. 1 nm nanoparticles showing high activity at 30 °C. The simultaneous presence of metallic and oxidized Pt enables a synergy between these phases. The main role of metallic Pt phase is to provide strong adsorption sites for CO, while that of oxidized Pt supposedly supplies reactive oxygen. Our results emphasize the complex dual oxidic-metallic nature of supported Pt catalysts and its evolving nature under reaction conditions, warranting a whole rethink of the mechanism of other reaction and metals, particularly redox and electrochemical reactions.
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https://hal.archives-ouvertes.fr/hal-03105968
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Submitted on : Wednesday, March 3, 2021 - 6:16:29 PM
Last modification on : Thursday, March 4, 2021 - 3:06:56 AM

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Frédéric Meunier, L. Cardenas, H. Kaper, B. Smid, M. Vorokhta, et al.. Synergy between Metallic and Oxidized Pt Sites Unravelled during Room Temperature CO Oxidation on Pt/Ceria. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2021, 60 (7), pp.3799-3805. ⟨10.1002/anie.202013223⟩. ⟨hal-03105968⟩

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