Metal‐organic frameworks (MOFs) are playing a key role in developing the next generation of heterogeneous catalysts. In this work, near ambient pressure X‐ray photoelectron spectroscopy (NAP‐XPS) is applied to study in operando the CO oxidation on Pt@MOFs (UiO‐67) and Pt@ZrO₂ catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O₂ ambient at 3 mbar. Upon the ignition at ca. 200 °C, the signature Pt binding energy (BE) shift towards the lower BE (from 71.8 to 71.2 eV) is observed for all catalysts, confirming metallic Pt nanoparticles (NPs) as the active phase. Additionally, the plug‐flow light‐off experiments show the superior activity of the Pt@MOFs catalyst in CO oxidation than the control Pt@ZrO₂ catalyst with ca. 28 % drop in the T_50% light‐off temperature, as well as high stability, due to their sintering‐resistance feature. These results provide evidence that the uniqueness of MOFs as the catalyst supports lies in the structural confinement effect.

中文翻译：

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通过 Operando XPS 了解 MOF 支持的 Pt 纳米颗粒上的 CO 氧化

金属有机框架（MOF）在开发下一代多相催化剂中发挥着关键作用。在这项工作中，近环境压力 X 射线光电子能谱 (NAP-XPS) 用于研究Pt@MOFs (UiO-67) 和 Pt@ZrO ₂催化剂上的 CO 氧化，揭示了相同的 Pt 表面动力学。化学计量 CO/O ₂环境压力为 3 mbar。在大约点火时。200 °C 时，所有催化剂的特征 Pt 结合能 (BE) 均向较低 BE（从 71.8 eV 到 71.2 eV）移动，证实金属 Pt 纳米颗粒 (NP) 为活性相。此外，活塞流起燃实验表明，Pt@MOFs 催化剂在 CO 氧化中的活性比对照 Pt@ZrO ₂催化剂具有约. 由于其耐烧结特性， T _50%起燃温度下降 28% ，并且稳定性高。这些结果证明MOF作为催化剂载体的独特性在于结构限制效应。