采用低温（-10℃）共沉淀技术制备Fe-Mn催化剂，研究Mn助剂对合成气直接制低碳烯烃（FTO）反应的影响。考察了不同Mn摩尔分数对催化剂的结构和性能的影响，结果表明，添加的Mn具有显著的几何分散效应和电子效应。构效关系研究发现，催化活性与催化剂的H₂吸附量有关，而与催化剂比表面积和Fe-Mn间相互作用关系不大，其中添加摩尔分数20%的Mn可以使Fe基催化剂表面形成最多的吸附活性位，转换频率（TOF）为5.7×10^-3 s^-1。

A series of Fe-Mn catalysts are prepared by means of low temperature (-10℃) coprecipitation technique,and the effect of Mn promoter on the performance of the catalysts in direct production of low-carbon olefin (FTO) from syngas is studied.Furthermore,the effects of different molar fractions of Mn on the structure and properties of the catalysts are investigated.Results show that the added Mn has significant geometric dispersion effects and electronic effects.It is found through the structure-activity relationship study that the catalytic activity is related to the adsorption amount of the catalyst to H₂,but has little relationship with the specific surface area of the catalyst and the interaction between Fe and Mn.Adding 20% Mn can form the most active sites on the surface of Fe-based catalyst,and the conversion frequency (TOF) is 5.7×10^-3(s^-1).

张国超(1991-),男,硕士研究生,研究方向为工业催化,623081516@qq.com