To obtain a suitable catalyst for simultaneous removal of mercury and HCHO from waste flue gas, we prepared and investigated CoOx-CeO₂ loaded on commercial activated coke granules treated with sulfate acid by impregnation method to remove the two toxic gases. The results revealed that the removal efficiencies of Hg⁰ and HCHO over Co₈Ce₃/ACs catalyst were 69.43% and 71.07% respectively in the presence of N₂ and 6% O₂ at 190 °C. And the presence of Hg⁰ had little impact on HCHO removal, but formaldehyde had a certain effect on Hg⁰ removal. In addition, the effects of individual flue gas component including O₂, NO, SO₂ and H₂O on Hg⁰ and HCHO simultaneous removal performance over Co₈Ce₃/ACs catalyst were researched. The physicochemical properties of catalysts were characterized using BET, SEM, XRD, XPS, H₂-TPR and FTIR. By analyzing these characterization results, it was found that the good removal property of the Co₈Ce₃/ACs catalyst was connected with good texture property, high dispersion of cobalt species and strong redox ability. Besides, the interaction between Co and Ce oxides phases could enhance the mobility of active oxygen species, which greatly improved the removal efficiencies of Hg0 and HCHO. Combined with the experiment and characterization results, end products of Hg⁰ and HCHO are mainly HgO, CO₂ and H₂O, respectively. So the mechanisms for simultaneous removal of mercury and HCHO were proposed. Of course, the Co₈Ce₃/ACs catalyst would be still modified to achieve the goal of practical industrial application.

为了获得从废气中同时去除汞和HCHO的合适催化剂，我们制备并研究了CoOx-CeO ₂负载在通过硫酸法处理的商业活化焦炭颗粒上的浸渍方法，以去除两种有毒气体。结果表明，在190°C下，在N ₂和6％O ₂存在下，Hg ⁰和HCHO在Co ₈ Ce ₃ / ACs催化剂上的去除效率分别为69.43％和71.07％。Hg ⁰的存在对HCHO的去除影响很小，但是甲醛对Hg ^0的去除有一定的影响。此外，包括O ₂的单个烟气成分的影响研究了在Co ₈ Ce ₃ / ACs催化剂上，Hg ⁰和HCHO上的NO，SO ₂和H ₂ O的同时去除性能。使用BET，SEM，XRD，XPS，H ₂ -TPR和FTIR表征了催化剂的理化性质。通过分析这些表征结果，发现Co ₈ Ce ₃的良好去除性能。/ ACs催化剂具有良好的织构性能，钴物种的高分散性和强大的氧化还原能力。此外，Co和Ce氧化物相之间的相互作用可以增强活性氧的迁移率，从而大大提高了Hg0和HCHO的去除效率。与实验和表征结果相结合，汞的终产物⁰和HCHO主要氧化汞，CO ₂和H ₂ O，分别。因此提出了同时去除汞和HCHO的机理。当然，仍可以对Co ₈ Ce ₃ / ACs催化剂进行改性，以达到实际工业应用的目的。