Background:
V2O5–WO3(MoO3)/TiO2 catalyst, as the core of selective catalytic reduction of NO with NH3
(SCR) has some drawbacks, such as high working temperature window (300-400oC), the toxicity of V-based catalyst and
so on. Therefore, development of the catalyst with better low temperature denitration catalyst and weaker toxicity is
necessary.
Objective:
Highly dispersed MnOx/CNTs catalysts with excellent denitration activity at 80-180oC, and weaker toxicity of
MnOx. It is worth noting that an in-situ precipitation method based on the reaction of manganese acetate and sodium
carbonate, which is advantageous to the in-situ deposition of active component, and the catalytic activity.
Methods:
MnOx/CNTs catalysts with different Mn/C molar ratio were fabricated by in-situ precipitation method due to the
reaction of manganese acetate and sodium carbonate. And the microstructure, crystalline property, the content of surface
element, valence state, redox property, and catalytic activity was confirmed by FESEM, TEM, XRD, XPS, TPD, and fixedbed reactor.
Results:
The as-prepared MnOx/CNTs catalysts exhibit outstanding low temperature SCR activity. And the NO conversion
of the optimum 1.2% MnOx/CNTs catalyst reached 57.4-89.2% at 80-180oC, which resulted from the amorphous MnOx
catalysts, higher ratio of Mn4+/Mn3+ and OS/(OS+OL).
Conclusion:
MnOx/CNTs catalysts have been prepared by the in-situ precipitation method based on the reaction of
manganese acetate and sodium carbonate. And the resultant MnOx/CNTs catalysts presented excellent low temperature
denitration activity between 80oC and 180oC. Among them, the 1.2% MnOx/CNTs catalyst exhibited the first rate low
temperature denitration activity, and the denitration activity attained 57.4-89.2%, which may be owing to the presence of
the weakly crystalline or amorphous MnOx, higher ratio of Mn4+/Mn3+ and OS/(OS+OL).
Improving the Performance of Gd Addition on Catalytic Activity and SO2 Resistance over MnOx/ZSM-5 Catalysts for Low-Temperature NH3-SCR