Fe-MnO_x催化剂低温NH_3选择性催化还原NO_x

Selective Catalytic Reduction of NO_x with NH_3 by Fe-MnO_x Catalysts at Low-Temperature

采用柠檬酸法制备了Fe-MnOx复合氧化物催化剂,并将其应用于低温NH3选择催化还原NOx反应.结果表明,Fe/(Fe+Mn)摩尔比为0.4的催化剂具有最佳的低温催化活性,采用乙酸锰制备的催化剂表现出明显优于以硫酸锰为前驱体的催化剂的低温催化活性.XRD和H2-TPR表征结果表明,催化剂中存在着Fe-Mn固溶体是其具有较高低温SCR活性的主要原因.

Fe-MnOx composite oxide catalysts synthesized by the coprecipitation route were tested in selective catalytic reduction of NOx by NH3 at low temperature. The results show that the Fe-MnOx catalysts with a Fe： Mn molar ratio of 0.5 exhibits the best performance. The predecessor of Mn has an important effect on the cata- lytic activity, and the catalyst made of Mn （ C2 H3 02 ） 2 shows higher NO x conversion than that of MnSO4. The characterization results of X-ray diffraction （XRD） and H2-temperature programmed reduction （H2-TPR） show that the catalysts made of Mn （C2 H3 02 ）2 contains Fe3 Mn3 08 Phase, which could lead to the high SCR ac- tivity at low temperature.