Inelastic neutron scattering study of the H2 interaction with carbon-supported Pt and Pd catalysts

Carbon-supported Pt and Pd catalysts are largely employed as heterogeneous catalysts for hydrogenation reactions. Albeit their routine use in industry, many details about their interaction with H2 are still not completely understood. In this article, we propose a detailed investigation of the behavi...

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Bibliographic Details
Published in:Catalysis today 2023-11, Vol.423, p.114009, Article 114009
Main Authors: Vottero, Eleonora, Carosso, Michele, Pellegrini, Riccardo, Jiménez-Ruiz, Mónica, Groppo, Elena, Piovano, Andrea
Format: Article
Language:English
Subjects:
Activated carbon
Hydrogen spillover
INS spectroscopy
Metal hydride
Palladium nanoparticle
Platinum nanoparticle
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Summary:Carbon-supported Pt and Pd catalysts are largely employed as heterogeneous catalysts for hydrogenation reactions. Albeit their routine use in industry, many details about their interaction with H2 are still not completely understood. In this article, we propose a detailed investigation of the behavior in the presence of H2 of an activated carbon and of two catalysts obtained by depositing on it Pt and Pd nanoparticles by means of Inelastic Neutron Scattering (INS) spectroscopy. The high-quality INS spectra of the three samples were measured in absence and in presence of different amounts of H2, providing very detailed information about H2 physisorption on each system and about the nature of the metal hydrides formed upon hydrogenation of the catalysts. In addition, we were also able to obtain a direct observation of the occurrence of hydrogen spillover from the metal nanoparticles onto the activated carbon, as revealed by the increase of the number of C-H species at the borders of the graphenic domains. Overall, this work provides important insights for better understanding the complex nature of the interaction between H2 and Pt and Pd-loaded activated carbon catalysts. [Display omitted] •The interaction of H2 with supported Pt and Pd catalysts was investigated by INS.•Significantly less molecular H2 was physisorbed by the Pd-based catalyst.•The supported Pt nanoparticles underwent a reconstruction upon formation of Pt-H.•Surface and/or subsurface PdH species were possibly observed.•An increase in the amount of C-H was observed, directly indicating H-spillover.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2023.01.016