文献类型：期刊文献

英文题名：Tuning direct CO hydrogenation reaction over Fe-Mn bimetallic catalysts toward light olefins: Effects of Mn promotion

作者：Yang, Zixu[1];Zhang, Zhengpai[1,2];Liu, Yitao[1];Ding, Xiaoxu[1];Zhang, Jun[1];Xu, Jing[1];Han, Yifan[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]SINOPEC Corp, Shanghai Res Inst Petrochem Technol, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 201208, Peoples R China

年份：2021

卷号：285

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20205209693549);WOS:【SCI-EXPANDED(收录号:WOS:000623244400005)】；

基金：The authors greatly acknowledge the funding support from Shanghai Sailing Program (19YF1411000), National Science Foundation (21878080), China Postdoctoral Science Foundation (2018M641034) and Ningxia Science Foundation (2019AAC03282). We appreciate the generous help in XAS experiments from the staff of the BL14W1 beamline at the Shanghai Synchrotron Radiation Facility (SSRF).

语种：英文

外文关键词：Syngas; Fischer-Tropsch synthesis; Light olefins; Fe-Mn bimetallic catalysts; Structure transformation

摘要：Highly dispersed FeMn bimetallic nanoparticles prepared by a low-temperature co-precipitation method were employed for direct CO hydrogenation for light olefins (C-2 similar to C-4=). An outstanding selectivity (60.6 %) for light olefins at a CO conversion level of 7.6 % was obtained over FeMn (4:1) catalyst activated by syngas (5%CO/5% H-2). Characterization indicated that a strong interaction between Fe and Mn resulted in significant effects on stabilization of Fe1-xMnxO phase during activation period. Responding to the morphology effect, Mn decreased the surface energy of nanocrystals and weakened the agglomeration of nanoparticles, thus resulted in a decrease in particle size of Mn-promoted catalysts. The combined effects of inhibited carburization and improved metal dispersion contributed to the volcano pattern in the catalytic activity of Mn-promoted catalysts. In addition, Mn may act as an effective electron donor to Fe, enhancing CO dissociative adsorption while inhibiting secondary hydrogenation of olefins, thus giving rise to high olefin selectivity in CO hydrogenation.