Abstract: A comparative study of the interaction of palladium supported on the surface of highly oriented pyrolytic graphite (Pd/HOPG) with oxygen and nitrogen dioxide was carried out using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The samples were prepared by vacuum deposition of metallic Pd onto HOPG; the size of the resulting particles was ≤5 nm. The samples were treated in oxygen at room temperature or 150°C and a pressure of 20 mbar. The interaction with NO2 was carried out at room temperature and a pressure of 10–6 mbar. For the two oxidants used, O2 and NO2, fundamental differences in their effects on Pd/HOPG were found. At room temperature, the treatment in O2 was limited by the formation of some amount of oxygen-containing compounds CxOy on the surface of the carbon support. After increasing the temperature to 150°C, a portion of palladium was converted into a PdO oxide. When NO2 was used as an oxidizing reagent, intense oxidative destruction of graphite occurred to a depth of 10–15 graphene layers. Palladium remained in a metallic state, but its particles penetrated deep into the carbon support, which led to significant screening of its lines in the X-ray photoelectron spectrum and the disappearance of particles in SEM images. A possible mechanism for the interaction of Pd/HOPG with O2 and NO2 has been proposed, which allowed us to explain the different behaviors of these oxidizing molecules.

Cite: Smirnov M.Y. , Kalinkin A.V. , Salanov A.N. , Bukhtiyarov V.I.
Comparison of the Reactivity of O2 and NO2 Relative to Palladium Supported on HOPG
Kinetics and Catalysis. 2024. V.65. N6. P.745-756. DOI: 10.1134/S0023158424601992 WOS Scopus РИНЦ AN OpenAlex

Dates:

Submitted:	Aug 26, 2024
Accepted:	Sep 11, 2024
Published print:	Dec 1, 2024

Identifiers:

Web of science:	WOS:001432561900014
Scopus:	2-s2.0-85218443055
Elibrary:	80381331
Chemical Abstracts:	2025:474201
OpenAlex:	W4407893518

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