在DM-Ⅱ高硅沸石担载的Fe-MnO催化剂中添加碱性助剂可提高催化剂的活性及C_2~=～C_4~=烯烃选择性,且随着碱性增强,催化剂性能不断改善,随助剂MnO含量的增加,低碳烯烃的选择性不断提高,而催化剂活性有一极大值。研究表明,金属活性组分以适当的粒度分散在分子筛表面,MnO可提高其分散度,添加碱性助剂不利于金属组分的还原,但其“电子效应”却显著改善了催化剂性能,MnO能促进铁的还原,从而提高了催化剂的活性。 The addition of a basic auxiliary to the DM-Ⅱ high-silica zeolite Fe-MnO catalyst can improve the catalyst activity and C 2 ~ = C 4 ~ = olefin selectivity, and as the basicity increases, the performance of the catalyst improves continuously with Additive MnO content increased, the selectivity of lower olefins continue to increase, while the catalyst activity has a maximum value. The results show that the metal active component is dispersed on the surface of molecular sieve with suitable particle size. MnO can improve its dispersion degree. Adding alkaline assistant is unfavorable to the reduction of metal component, but the “electronic effect” remarkably improves the catalyst performance. MnO Can promote the reduction of iron, thereby increasing the activity of the catalyst.