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Looking for the active hydrogen species in a 5wt% Pt/C catalyst: a challenge for Inelastic Neutron Scattering

Abstract

We looked at the active hydrogen species in a highly dispersed and very homogeneous 5wt% Pt/C industrial catalyst (Pt particle mean diameter of 2.0 ± 0.5 nm) for hydrogenation reactions, by coupling H2 adsorption measurements with Inelatic Neutron Scattering (INS). Taking advantage of the enormous progresses undergone by the INS instruments, we succedeed in collecting INS spectra of unprecedented quality that allowed us: 1) demonstrating that the Pt nanoparticles are mainly located at the regular edges of the sp2 graphitic domains on the activated carbon; 2) validating that most of the H2 physisorbed on the carbon is side-on adsorbed; 3) detecting for the first time H2 molecules adsorbed on hydride-covered Pt nanoparticles; 4) observing Pt-hydrides (on the Pt/C catalyst with the lowest Pt loading among those investigated by INS so far) and 5) providing evidences for the occurrence of spillover of atomic hydrogen from the Pt surface to unsaturated reactive sites located at the irregular borders of the sp2 domains on the activated carbon.

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Publication details

The article was accepted on 05 Jan 2018 and first published on 05 Jan 2018


Article type: Paper
DOI: 10.1039/C7FD00214A
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Looking for the active hydrogen species in a 5wt% Pt/C catalyst: a challenge for Inelastic Neutron Scattering

    M. Carosso, A. Lazzarini, A. Piovano, R. Pellegrini, S. Morandi, M. Manzoli, J. G. Vitillo, M. Jimenez-Ruiz, C. Lamberti and E. Groppo, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C7FD00214A

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