MnFeO_x的制备及低温催化氧化NO_x的研究

Preparation of MnFeO_x and its catalytic oxidation of NO_x at low-temperature

采用有机溶剂法制备MnFeO_x催化剂。考察了是否添加铁离子、PEG含量、焙烧温度对催化剂低温脱硝性能的影响,并采用SEM、XRD和BET对催化剂进行表征。结果表明,Fe的添加能有效提高MnFeO_x的低温脱硝活性,当添加Fe时,催化剂比表面积大,活性组分的分散度高,催化剂低温脱硝性能佳。PEG含量对MnFeO_x催化剂的催化氧化NO_x效率影响小。焙烧温度影响非负载氧化物的价态和晶体的分散度,焙烧温度350℃时,催化剂低温脱硝性能最优且孔隙结构较好,是催化氧化NO_x的良好催化剂。

The MnFeOx catalyst was prepared by the organic solvent method.The effects of adding Fe,PEG content,and calcination temperature on the performance of catalysts for low temperature denitrification were studied.The catalysts were characterized by SEM,XRD and BET.The results show that the addition of Fe can effectively improve the low-temperature denitrification activity of MnFeOx.When Fe is added,the specific surface area of the catalyst is large,the dispersion degree of the active component is high,and the performance of the catalyst at low temperature is excellent.The PEG content has little effect on the NOx efficiency of the MnFeOx catalyst.The calcination temperature affects the valence state of the unsupported oxide and the dispersion of the crystal.When the calcination temperature is 350°C,the catalyst has the best low-temperature denitration performance and good pore structure,which is a good catalyst for catalytic oxidation of NOx.