Preparation and characteristics of Mn-Ce doped Fe-based catalysts using metallurgical dust and mud containing iron

The components of metallurgical solid wastes, such as metallurgical dust and sludge containing iron are complex, and the current NOx emission during metallurgical sintering is also a top priority for pollution control in the steel industry. The research has proposed modifying metallurgical dust and sludge iron containing to prepare doped low-temperature catalysts, and preparing Mn-Ce doped dust and sludge iron containing based catalysts (Mn0.05Ce0.1/AMD). The research results show that NOx removal rate of Mn0.05Ce0.1/AMD catalyst reaches over 90% and exhibits excellent resistance to SO2 and H2O in the wide temperature range of 170~430℃; The active components in the catalyst have good dispersibility and excellent mesoporous structure, thereby reducing surface crystallinity. Moreover, Mn doping increases the concentration of Fe3+while sacrificing a certain Ce3+concentration and high valence Mnx+ions, resulting in the most balanced denitrification activity of the catalyst. In addition, the synergistic effect between Fe-Ce-Mn improves the surface acidity of the catalyst, thereby increasing the Lewis acidic sites. It further promotes the formation of NO2 and nitrate species activated by electrostatic polarization. The research results can provide theoretical references for the high value-added utilization of metallurgical solid wastes.