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Topics in Catalysis
Erschienen in: Topics in Catalysis 5-7/2016

04.01.2016 | Original Paper

Oxidation of Small Supported Platinum-based Nanoparticles Under Near-Ambient Pressure Exposure to Oxygen

verfasst von: Ahmed Naitabdi, Robert Fagiewicz, Anthony Boucly, Giorgia Olivieri, Fabrice Bournel, Héloïse Tissot, Yawei Xu, Rabah Benbalagh, Mathieu G. Silly, Fausto Sirotti, Jean-Jacques Gallet, François Rochet

Erschienen in: Topics in Catalysis | Ausgabe 5-7/2016

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Abstract

The investigation of nanocatalysts under their working conditions of pressures and temperatures represents a real strategy toward a realistic understanding of their chemical reactivity and related issues. Additionally, the reduction of Pt load in the catalysts while maintaining their optimum performances is essential to large scale practical applications. Here, we show that small PtZn bimetallic nanoparticles (NPs) supported on the rutile and reduced TiO2(110)-(1 × 1) surface can be prepared by a two step consecutive deposition process where Pt was deposited first and followed by Zn. In situ synchrotron-based near ambient pressure photoemission spectroscopy experiments are used to monitor the evolution of the oxidation states and surface elemental composition of pure Pt and PtZn NPs under high exposure to O2 pressure. The formation of stable Pt surface oxide was evidenced for both pure and PtZn NPs. While a sizeable encapsulation of pure Pt NPs by TiOx was seen after annealing at 440 K under 1 mbar of O2, no such effect was noticed for PtZn NPs. The formation of a zinc oxide layer on PtZn NPs enhances the stability of the NPs and induces a partial reduction of the TiO2(110) surface. Spontaneous formation of a Pt–Zn alloy phase at room temperature was seen in PtZn NPs.
Vorheriger Artikel Hydrogen Intercalation of Graphene and Boron Nitride Monolayers Grown on Pt(111)
Nächster Artikel Heterogeneous Oxygen-Containing Species Formed via Oxygen or Water Dissociative Adsorption onto a Gallium Phosphide Surface

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Metadaten
Titel
Oxidation of Small Supported Platinum-based Nanoparticles Under Near-Ambient Pressure Exposure to Oxygen
verfasst von
Ahmed Naitabdi
Robert Fagiewicz
Anthony Boucly
Giorgia Olivieri
Fabrice Bournel
Héloïse Tissot
Yawei Xu
Rabah Benbalagh
Mathieu G. Silly
Fausto Sirotti
Jean-Jacques Gallet
François Rochet
Publikationsdatum
04.01.2016
Verlag
Springer US
Erschienen in
Topics in Catalysis / Ausgabe 5-7/2016
Print ISSN: 1022-5528
Elektronische ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-015-0529-z

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