Catalytic oxidation is an efficient way for removing low-concentration of toxic CO. The noble metal catalysts demonstrate outstanding catalytic properties in CO oxidation, but their high-cost present great challenges for further applications. Thus, developing atomically dispersed noble metal on support is a promising candidate because of the highest atom utilization efficiency. In this paper, a range of MgFeO supported atomically dispersed Pt catalysts with different Pt loading (1–5 wt.%) have been successfully developed by simple incipient wetness impregnation technique. The activity of Pt/MgFeO increases with Pt loading for CO oxidation. The catalytic activity of the 5Pt/MgFeO (T = 102 °C, T = 133 °C) is much better than that of the 5Pt/FeO (T = 132 °C, T = 146 °C) and commonly used 5Pt/AlO with PtO size of ∼1.6 nm (T = 156 °C, T = 163 °C) at WHSV of 30,000 mL h g. All Pt/MgFeO catalysts displayed superior cyclic stability throughout five consecutive heating–cooling cycles via a possible reaction mechanism of Mars–van Krevelen. The 1Pt/MgFeO and 3Pt/MgFeO were gradually deactivated in the long-term catalytic stability testing of 150 °C, and the activity could be fully restored after regeneration, suggesting that the catalysts deactivation was due to the formation of carbonates. These above results provide a useful reference for the development of advanced CO oxidation catalysts in the future.

中文翻译：

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轻松制造 MgFe2O4 上原子分散的 Pt 催化剂以实现有效的 CO 氧化

催化氧化是去除低浓度有毒CO的有效方法。贵金属催化剂在CO氧化中表现出优异的催化性能，但其高成本给进一步应用带来了巨大挑战。因此，由于最高的原子利用效率，在载体上开发原子分散的贵金属是一个有前途的候选者。在本文中，通过简单的初湿浸渍技术成功开发了一系列具有不同 Pt 负载量（1-5 wt.%）的 MgFeO 负载原子分散 Pt 催化剂。 Pt/MgFeO 的活性随着 Pt 负载量的 CO 氧化而增加。 5Pt/MgFeO (T = 102 °C, T = 133 °C) 的催化活性远优于 5Pt/FeO (T = 132 °C, T = 146 °C) 和常用的 5Pt/Al2O PtO 尺寸为 ∼1.6 nm（T = 156 °C，T = 163 °C），WHSV 为 30,000 mL h g。所有 Pt/MgFeO 催化剂通过 Mars-van Krevelen 可能的反应机制，在五个连续加热-冷却循环中表现出优异的循环稳定性。 1Pt/MgFeO和3Pt/MgFeO在150℃的长期催化稳定性测试中逐渐失活，再生后活性可完全恢复，表明催化剂失活是由于碳酸盐的形成所致。上述结果为今后先进CO氧化催化剂的开发提供了有益的参考。