文献类型：期刊文献

英文题名：Sodium modified Fe-Mn microsphere catalyst for Fischer-Tropsch synthesis of light olefins

作者：Zhang, Hewei[1];Zhang, Haitao[1];Qian, Weixin[1];Wu, Xian[1];Ma, Hongfang[1];Sun, Qiwen[2];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Sch Chem Engn, Minist Educ,State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2022

卷号：388

起止页码：199

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20203309050622);WOS:【SCI-EXPANDED(收录号:WOS:000760326500005)】；

基金：We gratefully acknowledge the financial supports from the National Natural Science Foundation of China (grant no. 21706068) , the National High Technology Research and Development Plan of China (863 plan, 2011AA05A204) , and the Fundamental Research Funds for the Central Universities (no. 50321012017013) .

语种：英文

外文关键词：Fischer -Tropsch synthesis; Fe (3) O (4) microsphere catalyst; Mn and Na promoters; Light olefins

摘要：Both one-pot solvothermal method and impregnation were adopted to synthesize sodium modified Fe-Mn microsphere catalysts for Fischer-Tropsch synthesis (FTS) of light olefins. The effects of Mn and Na promoters on the microsphere morphology, electronic state and catalytic performance of Fe3O4 catalysts were evaluated by Ar adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectroscopy mapping (EDS-mapping), H2 temperature-programmed reduction (H2-TPR), CO temperature-programmed desorption (CO-TPD), X-ray photoelectron spectroscopy (XPS) and Mo center dot ssbauer spectra. SEM, TEM and Ar adsorption-desorption showed that catalysts were in a uniform spherical shape with the size of 300-400 nm, while FeMn microsphere owned a smaller size and a larger surface area. Mn promoter could enhance the chemisorption of CO, and suppressed the hydrogenation of olefins, then lead to higher selectivity of light olefins. Na promoter strengthened the FTS reaction activity due to its basicity and electronic donation. Mn15Na32im showed the highest CO conversion of 97.21 % with the light olefin selectivity of 33.02 %.