The promotional effect of MnOx on (NH4)2S2O8-modified activated coke for selective catalytic reduction of NO with NH3 at low temperature.

In this study, Manganese oxide (MnO x) was supported on activated coke modified by (NH 4) 2 S 2 O 8 (ACs) to obtain novel MnO x /ACs catalysts with high NO x removal performance by excessive impregnation method. The influence of precursor and loading amount of MnO x on the catalytic efficiency were studied. The Mn 3 O 4 supported on ACs samples prepared with manganese acetate tetrahydrate as precursor and the loading amount of 8% Mn is the most effective in NO x removal among modified samples and its removal efficiency is 97% at 180 °C. And the adsorption state and reaction behaviors of NH 3 , NO and O 2 on MnO x /ACs catalysts were measured by in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) in different conditions in order to study the effect of MnO x and the reaction mechanism. The results suggested that Eley-Rideal and Langmuir-Hinshelwood mechanism existed simultaneously for the selective catalytic reduction of NO over the MnO x /ACs catalyst. Image 1 • High efficiency of DeNO x catalyst was formed by Mn 3 O 4 loaded on active coke. • The best precursor agent and loading amount were discussed. • The mechanism of the reaction occurred on the catalyst was studied. [ABSTRACT FROM AUTHOR]