Abstract

In this work, X-ray photoelectron spectroscopy (XPS) was used to study the effect of preliminary oxidative treatment of a carbon support surface on the results of NO₂ interaction with model systems prepared by palladium deposition onto highly oriented pyrolytic graphite (HOPG). It was found that, in Pd/HOPG samples with the atomic ratios [O]/[C] ≤ 0.0035, the carbon support was oxidized with the destruction of its structure to a depth of 10–15 graphene layers. In this case, the palladium particles remained in a metallic state, and they penetrated into the near-surface layer of the support due to the deep oxidation of adjacent carbon atoms. At the atomic ratio [O]/[C] ≈ 0.01–0.02, the result of the interaction changed dramatically. In this case, the support remained stable, and the palladium particles were oxidized to form an oxide. This finding explained the high stability of supported palladium catalysts prepared on Sibunit carbon supports in oxidative catalysis reactions.

中文翻译：

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Pd/HOPG 模型系统中表面氧相对于二氧化氮稳定碳载体

摘要

_{本工作利用X射线光电子能谱(XPS)研究了碳载体表面初步氧化处理对NO 2}结果的影响。与通过将钯沉积到高定向热解石墨（HOPG）上制备的模型系统的相互作用。研究发现，在[O]/[C]原子比≤0.0035的Pd/HOPG样品中，碳载体被氧化，其结构被破坏，深度为10-15层石墨烯。在这种情况下，钯颗粒保持金属状态，并且由于相邻碳原子的深度氧化而渗透到载体的近表面层。当原子比[O]/[C] ≈ 0.01-0.02时，相互作用的结果发生了巨大的变化。在这种情况下，载体保持稳定，并且钯颗粒被氧化形成氧化物。这一发现解释了在 Sibunit 碳载体上制备的负载型钯催化剂在氧化催化反应中的高稳定性。