A series of Mn_xFe_y/AC catalysts synthesized by impregnation method were investigated on the efficient and stable removal of HCHO in the fix-bed reactor. Extensive characterizations, BET, SEM, XRD, H₂-TPR, XPS and FT-IR, were conducted to study the physicochemical properties, HCHO oxidation and surface reaction of catalysts. The optimal Mn_0.75Fe_6.02/AC showed enhanced HCHO removal efficiency of 98.30%, as well as excellent performance for simultaneous removal of HCHO (89.96%) and Hg⁰ (77.51%). NO and SO₂ balanced in N₂ would inhibit the removal of HCHO, while the addition of 6% O₂ weakened the negative effect of SO₂ and NO + 6% O₂ facilitated the removal of HCHO. Besides, the slight promotion effect of water vapor was contributed to the regeneration of consumed −OH via the activation of surface oxygen by adsorbed H₂O. Characterization results indicated that Mn_0.75Fe_6.02/AC possessed larger BET surface area, well-developed porosity and better dispersion of active components. Mn_0.75Fe_6.02/AC exhibited higher reducibility due to the synergistic effect between MnO_x and FeO_x, and the interaction between Mn-Fe oxides and AC support. At the same time, the oxygen-containing functional groups (C-O-, COO), abundant active surface oxygen and –OH facilitated both adsorption and oxidation of HCHO. Besides, the formate and carbonate intermediates formed on the surface of Mn_0.75Fe_6.02/AC in HCHO removal process, which could be further oxidized into CO₂ and H₂O. On the basis of above investigations, the mechanism of enhanced HCHO catalytic removal over Mn_xFe_y/AC was proposed.

研究了用浸渍法合成的一系列Mn _x Fe _y / AC催化剂对固定床反应器中HCHO的高效稳定脱除的作用。进行了表征，BET，SEM，XRD，H ₂ -TPR，XPS和FT-IR表征，研究了催化剂的理化性质，HCHO氧化和表面反应。最佳Mn _0.75 Fe _6.02 / AC表现出提高的HCHO去除效率98.30％，以及出色的同时去除HCHO（89.96％）和Hg ⁰（77.51％）的性能。NO和SO ₂的N平衡₂将抑制去除HCHO的，而加入的6％氧气₂减弱了SO ₂和NO + 6％O ₂的负面影响，促进了HCHO的去除。此外，水蒸气的轻微促进作用通过吸附的H ₂ O活化表面氧来促进消耗的-OH的再生。表征结果表明，Mn _0.75 Fe _6.02 / AC具有较大的BET表面积，发达的孔隙度并更好地分散活性成分。Mn _0.75 Fe _6.02 / AC由于MnO _x和FeO _x之间的协同作用而具有较高的还原性以及Mn-Fe氧化物与AC载体之间的相互作用。同时，含氧官能团（CO-，COO），丰富的活性表面氧和-OH促进了HCHO的吸附和氧化。此外，形成Mn的表面上的甲酸盐和碳酸盐的中间体_0.75铁_6.02 / AC在HCHO去除过程，其可以被进一步氧化成CO ₂和H ₂ O.在上述研究的基础上，提高HCHO催化去除的机理提出了Mn _x Fe _y / AC以上。