Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-020-16027-9
Title: Structural changes in noble metal nanoparticles during CO oxidation and their impact on catalyst activity
Authors: Chee, S.W.
Arce-Ramos, J.M.
Li, W.
Genest, A.
Mirsaidov, U. 
Issue Date: 2020
Publisher: Nature Research
Citation: Chee, S.W., Arce-Ramos, J.M., Li, W., Genest, A., Mirsaidov, U. (2020). Structural changes in noble metal nanoparticles during CO oxidation and their impact on catalyst activity. Nature Communications 11 (1) : 2133. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-020-16027-9
Rights: Attribution 4.0 International
Abstract: The dynamical structure of a catalyst determines the availability of active sites on its surface. However, how nanoparticle (NP) catalysts re-structure under reaction conditions and how these changes associate with catalytic activity remains poorly understood. Using operando transmission electron microscopy, we show that Pd NPs exhibit reversible structural and activity changes during heating and cooling in mixed gas environments containing O2 and CO. Below 400 °C, the NPs form flat low index facets and are inactive towards CO oxidation. Above 400 °C, the NPs become rounder, and conversion of CO to CO2 increases significantly. This behavior reverses when the temperature is later reduced. Pt and Rh NPs under similar conditions do not exhibit such reversible transformations. We propose that adsorbed CO molecules suppress the activity of Pd NPs at lower temperatures by stabilizing low index facets and reducing the number of active sites. This hypothesis is supported by thermodynamic calculations. © 2020, The Author(s).
Source Title: Nature Communications
URI: https://scholarbank.nus.edu.sg/handle/10635/198122
ISSN: 2041-1723
DOI: 10.1038/s41467-020-16027-9
Rights: Attribution 4.0 International
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