Fe-Mn based catalytic ceramic filters with SO2 resistance for NH3-SCR at low temperature

The Fe-Mn based catalyst was loaded on porous ceramic filter with impregnation method to prepare a catalytic ceramic filter which integrates the denitration and dust removal at low temperature. The effect of the Fe/Mn ratio and doping Sm on the catalytic performance of Fe-Mn based catalyst were studied. In the temperature range of 120 degrees C-220 degrees C, the Fe2Mn1Sm0.2Ox catalytic filter exhibited over 90% NO removal efficiency. When 100 ppm SO2 and 7vol.% H2O in the flue gas, the NO removal efficiency still maintained above 89% at 200 degrees C. These results proved that the Fe2Mn1Sm0.2Ox catalytic filter has excellent catalytic performance and excellent H2O and SO2 resistance at low temperature. In addition, the dust collection efficiency reached 99.99%. The NH3-TPD, H-2-TPR and XPS confirmed that the Fe2Mn1Ox catalysts doped with Sm have stronger surface acid, more surface absorbed oxygen and more oxygen vacancy, which lead to higher NH3-SCR activity and better SO2 and H2O resistance.