NO and CO are two primary pollutants in the sintering flue gas emission, posing significant challenges for the treatment. Under oxygen-enriched conditions, CO was easily oxidized to CO before participating in CO-SCR reaction as a reducing agent. Consequently, NH-SCR technology coupled with CO oxidation reaction is a promising approach for simultaneous NO and CO removal. In this study, a series of bifunctional CuO/MnO catalysts were synthesized using a combine of hydrothermal and wet impregnation methods, and their catalytic performance for simultaneous removal of NO and CO was assessed. CuO/α-MnO catalyst displayed outstanding catalytic activity for both NO and CO, achieving over 80 % NO removal efficiency and 96 % CO conversion rate at 150 °C, while CuO/β-MnO catalyst exhibited poor catalytic activity in the entire temperature range. Moreover, the interplay between the NH-SCR and CO catalytic oxidation reactions was also explored. XPS results revealed that the concentration of Mn and Cu species significantly influenced the catalytic activity of the catalysts for the simultaneous removal of NO and CO. Particularly, the presence of Mn species promoted “fast SCR” reaction, whereas Cu species demonstrated higher reactivity for both NO reduction and CO oxidation. DRIFTS analysis of transient reactions revealed that the L-H mechanism was followed over CuO/α-MnO catalyst in the NH-SCR reaction, while both the M-K and L-H mechanisms were observed in CO catalytic oxidation reaction.

中文翻译：

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双功能CuOx/MnO2催化剂的表面定制促进NH3选择性催化还原NO和O2氧化CO

NO和CO是烧结烟气排放中的两种主要污染物，给治理带来了巨大挑战。在富氧条件下，CO很容易被氧化为CO，然后作为还原剂参与CO-SCR反应。因此，NH-SCR 技术与 CO 氧化反应相结合是同时去除 NO 和 CO 的一种有前途的方法。本研究采用水热法和湿法浸渍相结合的方法合成了一系列双功能CuO/MnO催化剂，并评估了它们同时去除NO和CO的催化性能。 CuO/α-MnO催化剂对NO和CO均表现出优异的催化活性，在150℃下实现了超过80%的NO去除效率和96%的CO转化率，而CuO/β-MnO催化剂在整个温度范围内表现出较差的催化活性。此外，还探讨了 NH-SCR 和 CO 催化氧化反应之间的相互作用。 XPS结果表明，Mn和Cu物种的浓度显着影响催化剂同时去除NO和CO的催化活性。特别是，Mn物种的存在促进了“快速SCR”反应，而Cu物种对两者表现出更高的反应活性。 NO 还原和 CO 氧化。瞬态反应的DRIFTS分析表明，NH-SCR反应中CuO/α-MnO催化剂遵循LH机制，而CO催化氧化反应中观察到MK和LH机制。