Overcoming activity/stability tradeoffs in CO oxidation catalysis by Pt/CeO2

Benjamin Bohigues, Sergio Rojas-Buzo (), Davide Salusso, Yu Xia, Avelino Corma, Silvia Bordiga, Mercedes Boronat, Tom Willhammar, Manuel Moliner and Pedro Serna ()
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Benjamin Bohigues: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Sergio Rojas-Buzo: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Davide Salusso: CS 40220
Yu Xia: Stockholm University
Avelino Corma: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Silvia Bordiga: University of Turin
Mercedes Boronat: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Tom Willhammar: Stockholm University
Manuel Moliner: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Pedro Serna: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract The use of redox active metal oxides to support noble metals is critical in the design of highly-active CO oxidation catalysts for gas emissions control. Unfortunately, supports promoting the activity, such as CeO2, tend also to promote acute catalyst deactivation by turning highly-active metallic Pt clusters into less-active PtOx species, under practical reaction conditions (high-temperature and/or the excess of O2). This leads to a problematic activity/stability tradeoff where Pt/CeO2 catalysts, highly-active, and Pt on non-reducible supports, highly stable, are bookends. Herein, we report a method to trap Pt at V-shaped pockets/stepped sites of CeO2 that break this undesired correlation by showing both high activity and stability in the CO oxidation reaction. XAS, CO-DRIFT, XPS, HAADF-STEM, and DFT are used to infer that the generation of low order metallic Pt clusters connected to two crystallographic planes of the support is key to inhibit (deactivating) re-oxidation paths of the metal, as a result of the high-energy required to form disordered/distorted PtOx ensembles at these positions. This new material allows, thus, to operate outside the commonly observed, limiting, activity/stability tradeoff.

Date: 2025
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DOI: 10.1038/s41467-025-62726-6

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