Metal–support interaction (MSI) has been widely recognized to be playing a pivotal role in regulating the catalytic activity of various reactions. In this work, the degree of MSI between Pt and CeO₂ support was finely tuned by adjusting the activation condition, and the obtained catalysts were tested for the oxidative abatement of CO and HCHO under ambient conditions. The characterization of catalysts shows that activation of strongly interacting Pt-CeO₂ at higher temperatures by H₂ leads to a weaker MSI with increased electron density of Pt, and this modification of local electronic properties is demonstrated to result in enhanced O₂ adsorption/activation to prevent the CO self-poisoning effect, while it abates the activity of CO adsorption/activation and oxidation of adsorbed CO. The Pt-CeO₂ catalyst with a moderate MSI, which is able to balance each step in the catalytic cycle over Pt and Pt-CeO₂ interface domains, displays the highest activity for CO/HCHO oxidation under ambient conditions.

中文翻译：

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调整 Pt-CeO2 催化剂的金属-载体相互作用以增强氧化反应性

金属-载体相互作用（MSI）已被广泛认为在调节各种反应的催化活性方面发挥着关键作用。在这项工作中，通过调整活化条件来微调Pt和CeO ₂载体之间的MSI程度，并测试所得催化剂在环境条件下对CO和HCHO的氧化去除。催化剂的表征表明，在较高温度下通过 H ₂激活强相互作用的 Pt-CeO ₂会导致 Pt 电子密度增加而导致 MSI 变弱，并且这种局部电子性质的改变被证明导致 O ₂增强Pt-CeO ₂催化剂具有适度的 MSI，能够平衡催化循环中的每个步骤在 Pt 和 Pt-CeO ₂界面域上，在环境条件下显示出最高的 CO/HCHO 氧化活性。