FeO-based catalysts demonstrate significant potential for the selective catalytic reduction (SCR) of nitrogen oxides (NO) by CO. However, their effectiveness is limited at lower temperatures, impeding widespread industrial adoption. To overcome this, we optimize the FeO-based catalyst component through 3 wt% cobalt (Co) loading, which improves the synergistic removal of CO and NO pollutants. Our developed catalyst, Co-FeO on an amorphous SiO substrate, exhibits superior room-temperature activity in CO-SCR, achieving CO and NO conversion ratios as well as N selectivity above 80 % at 25 °C, and over 93 % at 100–500 °C. The enhancement in catalyst performance is elucidated through density functional theory calculations and experimental investigations, revealing the creation of heteronuclear active sites via metal modification, and consequent improvements in redox characteristics and acidity. Our findings offer a robust pathway towards the industrial implementation of ammonia-free-SCR technology with synergistic removal of CO and NO and provide insights for designing superior heterogeneous catalysts.

中文翻译：

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利用金属改性 Fe2O3 催化剂通过 CO 选择性催化还原 NOx 的优异室温效率

Fe3O基催化剂在 CO 选择性催化还原 (SCR) 氮氧化物 (NO) 方面表现出巨大潜力。然而，其有效性在较低温度下有限，阻碍了广泛的工业应用。为了克服这个问题，我们通过负载 3 wt% 的钴 (Co) 来优化 Fe3O 基催化剂组分，从而提高 CO 和 NO 污染物的协同去除效果。我们开发的催化剂，非晶 SiO 基底上的 Co-FeO，在 CO-SCR 中表现出优异的室温活性，实现 CO 和 NO 转化率以及 N 选择性在 25 °C 时超过 80%，在 100°C 时超过 93% 500℃。通过密度泛函理论计算和实验研究阐明了催化剂性能的增强，揭示了通过金属改性产生异核活性位点，以及随后氧化还原特性和酸度的改善。我们的研究结果为协同去除 CO 和 NO 的无氨 SCR 技术的工业实施提供了一条稳健的途径，并为设计优质多相催化剂提供了见解。