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

Abstract

Abstract 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 °C–220 °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 °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, H2-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.