Pt/TiO₂ catalysts, prepared by reduction pretreatment, showed enhanced catalytic activities in formaldehyde oxidation. X-ray photoelectron spectroscopy analysis confirmed that catalytic activity was affected by Pt valence states in the Pt/TiO₂ catalyst. Using O₂ re-oxidation tests, we showed that there was a correlation between the area of oxygen consumed and the ratio of metallic Pt species on the catalyst surface. The O₂ re-oxidation ability was involved in the production of the adsorbed formate intermediate from HCHO, confirmed through diffuse reflectance infrared Fourier transform spectroscopy analysis. Furthermore, metallic Pt species were involved in the oxidation of adsorbed CO to CO₂.

中文翻译：

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室温下Pt/TiO2催化剂表面活性氧吸附及其对甲醛氧化的影响；Pt 价态在该反应中的作用？

通过还原预处理制备的Pt/TiO _{2催化剂在甲醛氧化中表现出增强的催化活性。}X射线光电子能谱分析证实催化活性受Pt/TiO ₂催化剂中Pt价态的影响。使用 O ₂再氧化测试，我们发现氧气消耗的面积与催化剂表面上金属 Pt 物质的比例之间存在相关性。通过漫反射红外傅里叶变换光谱分析证实，O _{2再氧化能力参与了由 HCHO 生产吸附的甲酸盐中间体。}此外，金属 Pt 物质参与将吸附的 CO 氧化为 CO ₂。