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<p>The dynamic behavior of supported metal nanoparticles under reaction conditions is a key factor in their catalytic performance. Pt nanoparticles are particularly susceptible to structural relaxation induced by adsorbed CO and H<sub>2</sub>. In a hydrogenated state, theoretical models predict the reshaping of Pt nanoparticles, but also their shift away from the support. Here, we examine the dynamic structural behavior of well-dispersed 1-3 nm diameter Pt nanoparticles under hydrogenation conditions. Using time-resolved X-ray diffraction and pair distribution function analysis allied to a modulated&#xa0;excitation approach, we provide experimental evidence of the simultaneous “breathing” of the Pt nanoparticles and their detachment from the Al<sub>2</sub>O<sub>3</sub> support under H<sub>2</sub>. These effects appear size-dependent, reversible, and occur in both gas-phase (150 °C) and liquid-phase (cyclohexane, 70 °C) conditions. Achieving direct evidence of the behavior of supported metal nanoparticles towards structural deformation in reactive chemical environments is a groundbreaking step towards precise structural control of catalysts under reaction conditions.</p>

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Pt nanoparticles breathe and reversibly detach from Al2O3 in hydrogen

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月30日

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  • Daniele Bonavia,
  • Alberto Ricchebuono,
  • Paolo Lazzarini,
  • Eleonora Vottero,
  • Riccardo Pellegrini,
  • Andrea Piovano,
  • Céline Chizallet,
  • Pascal Raybaud,
  • Catherine Dejoie,
  • Ivo Alxneit,
  • Stefano Checchia,
  • Davide Ferri,
  • Elena Groppo

摘要

The dynamic behavior of supported metal nanoparticles under reaction conditions is a key factor in their catalytic performance. Pt nanoparticles are particularly susceptible to structural relaxation induced by adsorbed CO and H2. In a hydrogenated state, theoretical models predict the reshaping of Pt nanoparticles, but also their shift away from the support. Here, we examine the dynamic structural behavior of well-dispersed 1-3 nm diameter Pt nanoparticles under hydrogenation conditions. Using time-resolved X-ray diffraction and pair distribution function analysis allied to a modulated excitation approach, we provide experimental evidence of the simultaneous “breathing” of the Pt nanoparticles and their detachment from the Al2O3 support under H2. These effects appear size-dependent, reversible, and occur in both gas-phase (150 °C) and liquid-phase (cyclohexane, 70 °C) conditions. Achieving direct evidence of the behavior of supported metal nanoparticles towards structural deformation in reactive chemical environments is a groundbreaking step towards precise structural control of catalysts under reaction conditions.