Insights into Different Reaction Behaviors of Propane and CO Oxidation over Pt/CeO 2 and Pt/Nb 2 O 5 : The Crucial Roles of Support Properties

作者：Weiyue Wang, Dandan Li, Hongbo Yu, Chufeng Liu, Cen Tang, Jian Chen, Ji-Qing Lu, Meng‐Fei Luo · 发表于：The Journal of Physical Chemistry C · 年份：2021 · DOI：10.1021/acs.jpcc.1c05459 · 被引用次数：51 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Catalysis and Hydrodesulfurization Studies

Pt/CeO 2 and Pt/Nb 2 O 5 catalysts were employed to catalyze CO and propane oxidation. It was found that the Pt/CeO 2 catalyst was more active than the Pt/Nb 2 O 5 catalyst for CO oxidation, while it was less active in propane oxidation. The different behaviors were closely related to the nature of the support, which affected the properties of the active Pt species as well as the reaction pathways. For CO oxidation, the reaction took place at the Pt–CeO 2 interface of the Pt/CeO 2 catalyst. The facile activation of oxygen species on the CeO 2 with abundant oxygen vacancies accounted for its high activity, while the competitive adsorption of CO and O 2 on the surface Pt atoms led to a strong inhibiting role of oxygen on the reactivity, which was indicated by a negative reaction order of oxygen on the Pt/Nb 2 O 5 catalyst. For the propane oxidation, as metallic Pt species were beneficial for the activation of C–H bond in propane, the high concentration of metallic Pt species in the Pt/Nb 2 O 5 induced by the stabilizing effect of surface acidity of the Nb 2 O 5 support was responsible for its higher activity compared to the Pt/CeO 2 with oxidized Pt species.