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 °C–220 °C, the Fe₂Mn₁Sm_0.2O_x 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 Fe₂Mn₁Sm_0.2O_x 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 Fe₂Mn₁O_x 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. (paper)