Pt nanoparticles breathe and reversibly detach from Al2O3 in hydrogen

Daniele Bonavia, Alberto Ricchebuono, Paolo Lazzarini, Eleonora Vottero, Riccardo Pellegrini, Andrea Piovano, Céline Chizallet, Pascal Raybaud, Catherine Dejoie, Ivo Alxneit, Stefano Checchia (), Davide Ferri () and Elena Groppo ()
Additional contact information
Daniele Bonavia: European Synchrotron Radiation Facility (ESRF)
Alberto Ricchebuono: University of Turin
Paolo Lazzarini: University of Turin
Eleonora Vottero: University of Turin
Riccardo Pellegrini: Chimet S.p.A.
Andrea Piovano: Institut Laue Langevin (ILL)
Céline Chizallet: Rond-point de l’échangeur de Solaize
Pascal Raybaud: Rond-point de l’échangeur de Solaize
Catherine Dejoie: European Synchrotron Radiation Facility (ESRF)
Ivo Alxneit: PSI Center for Energy and Environmental Sciences
Stefano Checchia: European Synchrotron Radiation Facility (ESRF)
Davide Ferri: PSI Center for Energy and Environmental Sciences
Elena Groppo: University of Turin

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-63708-4

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