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Periodic structural changes in Pd nanoparticles during oscillatory CO oxidation reaction

Author

Listed:
  • Tanmay Ghosh

    (National University of Singapore
    National University of Singapore)

  • Juan Manuel Arce-Ramos

    (Agency for Science, Technology and Research)

  • Wen-Qing Li

    (Agency for Science, Technology and Research)

  • Hongwei Yan

    (National University of Singapore)

  • See Wee Chee

    (National University of Singapore
    National University of Singapore)

  • Alexander Genest

    (Agency for Science, Technology and Research
    Technische Universität Wien)

  • Utkur Mirsaidov

    (National University of Singapore
    National University of Singapore
    National University of Singapore
    National University of Singapore)

Abstract

Nanoparticle (NP) catalysts are ubiquitous in energy systems, chemical production, and reducing the environmental impact of many industrial processes. Under reactive environments, the availability of catalytically active sites on the NP surface is determined by its dynamic structure. However, atomic-scale insights into how a NP surface reconstructs under reaction conditions and the impact of the reconstruction on catalytic activity are still lacking. Using operando transmission electron microscopy, we show that Pd NPs exhibit periodic round–to–flat transitions altering their facets during CO oxidation reaction at atmospheric pressure and elevated temperatures. This restructuring causes spontaneous oscillations in the conversion of CO to CO2 under constant reaction conditions. Our study reveals that the oscillatory behavior stems from the CO-adsorption-mediated periodic restructuring of the nanocatalysts between high-index-faceted round and low-index-faceted flat shapes. These atomic-scale insights into the dynamic surface properties of NPs under reactive conditions play an important role in the design of high-performance catalysts.

Suggested Citation

  • Tanmay Ghosh & Juan Manuel Arce-Ramos & Wen-Qing Li & Hongwei Yan & See Wee Chee & Alexander Genest & Utkur Mirsaidov, 2022. "Periodic structural changes in Pd nanoparticles during oscillatory CO oxidation reaction," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33304-x
    DOI: 10.1038/s41467-022-33304-x
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    References listed on IDEAS

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    1. Yuri Suchorski & Martin Datler & Ivan Bespalov & Johannes Zeininger & Michael Stöger-Pollach & Johannes Bernardi & Henrik Grönbeck & Günther Rupprechter, 2018. "Visualizing catalyst heterogeneity by a multifrequential oscillating reaction," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    2. See Wee Chee & Juan Manuel Arce-Ramos & Wenqing Li & Alexander Genest & Utkur Mirsaidov, 2020. "Structural changes in noble metal nanoparticles during CO oxidation and their impact on catalyst activity," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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