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Periodic structural changes in Pd nanoparticles during oscillatory CO oxidation reaction.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Catalysis

Background:

  • Nanoparticle (NP) catalysts are crucial for energy, chemical production, and environmental applications.
  • Understanding NP surface dynamics under reaction conditions is vital for optimizing catalytic activity.
  • Current knowledge lacks atomic-scale insights into NP surface reconstruction and its impact on catalysis.

Purpose of the Study:

  • To investigate the atomic-scale surface restructuring of nanoparticle catalysts under reaction conditions.
  • To elucidate the relationship between NP surface dynamics and catalytic activity during CO oxidation.
  • To reveal the mechanism behind spontaneous oscillations in catalytic conversion.

Main Methods:

  • Operando transmission electron microscopy (TEM) was employed to observe nanoparticle behavior in real-time.
  • The study focused on Palladium (Pd) nanoparticles (NPs) during carbon monoxide (CO) oxidation.
  • Experiments were conducted under atmospheric pressure and elevated temperatures.

Main Results:

  • Palladium (Pd) NPs were observed to undergo periodic round-to-flat shape transitions, altering their facets.
  • These dynamic structural changes led to spontaneous oscillations in the conversion of CO to CO2.
  • The oscillations were attributed to CO-adsorption-mediated restructuring between high-index and low-index facets.

Conclusions:

  • The dynamic restructuring of NP surfaces significantly impacts catalytic activity, leading to oscillatory behavior.
  • CO adsorption plays a critical role in mediating these periodic surface reconstructions.
  • Atomic-scale understanding of NP dynamics under reactive conditions is essential for designing high-performance catalysts.