Investigation on denitrification performance of microwave synthesized high-efficiency MnOx catalysts for low-temperature NH3-SCR

A novel MnOx catalyst preparation method was designed. In this work, a series of MnOx catalysts were prepared using microwave-assisted preparation for low-temperature NH3-SCR and SO2 tolerance evaluation. The physicochemical properties of the catalysts were analyzed using BET, XRD, SEM, H-2-TPR, and NH3-TPD techniques. Notably, the microwave-3 min catalyst exhibited optimal catalytic performance, achieving a NO conversion of 94.20 % at 60 degrees C along with robust SO2 resistance. Furthermore, a comparative study was conducted on the MnO(x )catalysts synthesized with varying microwave times. The characterization results show that the MW-3 min catalyst displayed a higher proportion of manganese in a high valence state, with a (Mn3++Mn4+)/Mn total ratio of 87.36 %, and exhibited the highest oxygen adsorption capacity (O-alpha) at 42.40 %, coupled with reduced crystallinity. Catalysts featuring lower crystallinity offered increased reaction sites, thereby enhancing catalytic performance.