Monitoring Morphology and Hydrogen Coverage of Nanometric Pt/g-Al2O3 Particles by In Situ HERFD–XANES and Quantum Simulations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie International Edition Année : 2014

Monitoring Morphology and Hydrogen Coverage of Nanometric Pt/g-Al2O3 Particles by In Situ HERFD–XANES and Quantum Simulations

Résumé

Platinum nanoclusters highly dispersed on gamma-alumina are widely used as heterogeneous catalysts. To understand the chemical interplay between the Pt nanoparticles, the support, and the reductive atmosphere, we performed X-ray absorption near edge structure (XANES) in situ experiments recorded in high energy resolution fluorescence detection (HERFD) mode. Spectra are assigned by comparison with simulated XANES spectra on models obtained by molecular dynamics (DFT-MD). We propose platinum cluster morphologies and quantify the hydrogen coverages compatible with XANES spectra recorded at variable hydrogen pressures and temperatures. Using cutting-edge methodologies to assign XANES spectra, this work gives unequalled atomic insights into the characterization of supported nanoclusters.

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Dates et versions

hal-01080399 , version 1 (05-11-2014)

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Agnès Gorczyca, Virginie Moizan-Baslé, Céline Chizallet, Olivier Proux, William del Net, et al.. Monitoring Morphology and Hydrogen Coverage of Nanometric Pt/g-Al2O3 Particles by In Situ HERFD–XANES and Quantum Simulations. Angewandte Chemie International Edition, 2014, 53 (46), pp.12426. ⟨10.1002/anie.201403585⟩. ⟨hal-01080399⟩
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