Abstract
The interaction of a palladium foil with nitrogen dioxide in a temperature range of 30–450°C at three NO2 pressures of 10–6, 10–5, and 10–4 mbar was studied by X-ray photoelectron spectroscopy (XPS). In all cases, a three-dimensional oxide film was formed on the surface of palladium metal starting with a temperature of 150°C. Based on the measurements of the Pd 3d5/2, Pd 3p3/2, and O 1s binding energies and the [Pd] : [O] atomic ratio, it was found that the film consisted of the palladium oxide PdO. The oxide film thickness d was estimated based on the weakening of the Pd 3d line of metallic palladium. As the interaction temperature was increased, d initially increased to reach a maximum of ~3.5–5 nm; thereafter, it began to decrease due to the decomposition of PdO to a metallic state.
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ACKNOWLEDGMENTS
This work was supported by the Russian Science Foundation (project no. 14-23-00146).
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Translated by V. Makhlyarchuk
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Smirnov, M.Y., Klembovskii, I.O., Kalinkin, A.V. et al. An XPS Study of the Interaction of a Palladium Foil with NO2. Kinet Catal 59, 786–791 (2018). https://doi.org/10.1134/S0023158418060150
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DOI: https://doi.org/10.1134/S0023158418060150