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.
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Acknowledgments
The authors express their thanks to Christian Chauvet (TEMPO beamline, SOLEIL) for his very efficient technical support. The NAP-XPS experiment, managed by the LCPMR team (Université Pierre et Marie Curie), was funded by the Ile-de-France Region (Photoémission Environnementale en Ile-de-France, SESAME No 090003524), by the Agence Nationale de la Recherche (Surfaces under Ambient Pressure with Electron Spectroscopies, ANR- 08-BLAN-0096), and by the Université Pierre et Marie Curie. Synchrotron SOLEIL supported the integration of the setup to TEMPO beamline. LABEX MiChem (UPMC) also partially funded the experiment.
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Naitabdi, A., Fagiewicz, R., Boucly, A. et al. Oxidation of Small Supported Platinum-based Nanoparticles Under Near-Ambient Pressure Exposure to Oxygen. Top Catal 59, 550–563 (2016). https://doi.org/10.1007/s11244-015-0529-z
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DOI: https://doi.org/10.1007/s11244-015-0529-z