A comparative study on FeO_x-modified Pt/Nb₂O₅ catalyzing CO and propane oxidation has been conducted to differentiate the surface active sites demanded for these two important reactions. Pt-Fe/Nb₂O₅ displays improved activity for CO oxidation but decreased activity for propane oxidation compared to Pt/Nb₂O₅. Detailed characterizations reveal the alteration of the geometrical and electronic states of Pt species and surface acidity induced upon the addition of FeO_x, thus clarifying the divergent catalytic responses in CO and propane oxidation. Pt-FeO_x interface sites promotes oxygen activation that is a crucial step in CO oxidation, thereby accelerating the CO oxidation. However, the rate-determining step in propane oxidation is propane activation that requires the synergistic catalysis of acid sites and Pt⁰, the critical active sites for propane oxidation. The inferior activity of Pt-Fe/Nb₂O₅ in propane oxidation is explained by the coverage of acid sites and Pt species.

对 FeO _x修饰的 Pt/Nb ₂ O ₅催化 CO 和丙烷氧化进行了比较研究，以区分这两个重要反应所需的表面活性位点。_{与Pt/Nb 2} O ₅相比， Pt-Fe/Nb ₂ O ₅显示出改善的CO氧化活性但降低的丙烷氧化活性。_{详细的表征揭示了添加 FeO x}后 Pt 物种的几何和电子状态以及表面酸度的改变，从而阐明了 CO 和丙烷氧化中的不同催化反应。Pt-FeO _x界面位点促进氧活化，这是 CO 氧化的关键步骤，从而加速 CO 氧化。然而，丙烷氧化的决速步骤是丙烷活化，需要酸性位点和 Pt ⁰的协同催化，Pt 0是丙烷氧化的关键活性位点。_{Pt-Fe/Nb 2} O ₅在丙烷氧化中的较差活性可以用酸性位点和 Pt 物种的覆盖率来解释。