Study on the Reaction Performance of Ce- and Co-Modified Mn-Based Catalysts in C3H6-SCR

The C3H6-SCR de-NO x technology has received widespread attention dueto its significantdevelopment potential. Through Mn-y/& gamma;Al2O3 catalyst activity testing, the catalytic performanceof the Mn-5/& gamma;Al2O3 catalystwas the best, and the NO conversion could reach 60% at 275 & DEG;C.Afterward, Ce/Co modification was carried out on the Mn-5/& gamma;Al2O3 catalyst to prepare catalystswith different Ce/Co loadings, and activity testing was conducted.It was found that the catalytic performance of the catalyst was significantlyimproved after doping with promoters, and the improvement of catalyticperformance by Ce was much stronger than that of Co, and the dopingof Ce also reduced the optimal reaction temperature. Through NO-TPDand H-2-TPR, it can be found that, after doping with Ce,the catalyst's ability to adsorb NO and oxidation-reductionwere stronger than those of Co-doped catalysts, which explained thehigher catalytic performance of Mn-5/Ce-10-& gamma;Al2O3 catalyst. In a comparison of the characterizationresults of the Mn-5/Ce-10-& gamma;Al2O3 catalyst before and after the reaction, it can be foundthat the Mn-5/Ce-10-& gamma;Al2O3 catalyst had good reaction stability. The addition of Ce4+ can lead to the formation of the Mn-O-Ce bridge,thereby strengthening the binding between Mn and O and further promotingthe progress of C3H6-SCR. Finally, through insitu DRIFTS, it was found that the reaction of C3H6-SCR on the Mn-5/Ce-10-& gamma;Al2O3 catalyst followed the oxidation-reduction mechanismand generated the important intermediate product -NH.