surface analysis of palladium-platinum alloys in methane oxidation conditions

Palladium and palladium-platinum foils were analysed using temperature-programmed near-ambient pressure X-ray photoelectron spectroscopy (TP-NAP-XPS) under methane oxidation conditions. Oxidation of palladium is inhibited by the presence of water, and in oxygen-poor environments. Pt addition further...

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Published in:Faraday discussions 2022-08, Vol.236, p.157-177
Main Authors: Large, Alexander I, Bennett, Roger A, Eralp-Erden, Tugce, Held, Georg
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Summary:Palladium and palladium-platinum foils were analysed using temperature-programmed near-ambient pressure X-ray photoelectron spectroscopy (TP-NAP-XPS) under methane oxidation conditions. Oxidation of palladium is inhibited by the presence of water, and in oxygen-poor environments. Pt addition further inhibits oxidation of palladium across all reaction conditions, preserving metallic palladium to higher temperatures. Bimetallic foils underwent significant restructuring under reaction conditions, with platinum preferentially migrating to the bulk under select conditions. Pd and Pd-Pt alloys are studied with NAP-XPS under methane oxidation conditions. Pd-Pt catalysts showed greater resistance to oxidation under reaction conditions, with this coupled to surface restructuring and Pt migration away from the surface.
ISSN:1359-6640
1364-5498
DOI:10.1039/d1fd00113b