부산대학교 도서관

• Mn-Ce supported alkali-modified fly ash catalysts were synthesized. • The denitration performances of different alkali-modified fly ash catalysts were investigated. • Mn-Ce supported alkali-modified fly ash catalysts had better SO 2 and H 2 O resistance. • The activity mechanism of Mn-Ce supported alkali-modified fly ash catalysts was proved. Ultrasonic impregnation method was used to prepare Mn-Ce composite catalysts with fly ash and alkali-modified fly ash serving as the catalytic carriers. The effects on the denitration activity and resistance of H 2 O and SO 2 were studied. The structural characteristics of the catalysts were characterized and analyzed by XRD, XPS, SEM, TEM, TG, BET, and TPD/TPR. The results revealed that the active components Mn-Ce exhibited interaction, leading to a catalyst surface enriched with Mn4+, Ce3+, and chemisorption oxygen, thereby improving the catalytic activity. Through the alkali modification of fly ash, the structural properties of the carrier were changed, the distribution of active components was more uniform and the optimal loading capacity was increased. Alkali modified fly ash loaded with Mn and Ce had excellent surface acidity, redox characteristics, and abundant chemisorption oxygen, thereby enhancing the "rapid NH 3 -SCR" reaction. Finally, the catalytic resistance of H 2 O and SO 2 was also excellent. [ABSTRACT FROM AUTHOR]