文献类型：期刊文献

英文题名：Effect of Rare-Earth Promoters on Precipitated Iron-Based Catalysts for Fischer-Tropsch Synthesis

作者：Han, Zhonghao[1];Qian, Weixin[1];Zhang, Haitao[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, State Key Lab Chem Engn, Minist Educ,Sch Chem Engn, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2020

卷号：59

期号：33

起止页码：14598

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20204009298887);WOS:【SCI-EXPANDED(收录号:WOS:000563070900006)】；

基金：We gratefully acknowledge the financial support of the Nation High Technology Research and Development Plan of China (863 plan, 2011AA05A204) and the Fundamental Research Funds for the Central Universities (No: 222202017013).

语种：英文

外文关键词：Alkalinity - Fischer-Tropsch synthesis - Rare earths - X ray photoelectron spectroscopy - Orbits - Binary alloys - Catalyst selectivity - Iron alloys - Iron - Carbon dioxide - Gas adsorption - High resolution transmission electron microscopy

摘要：FeMn catalysts that were either unpromoted or promoted by five rare-earth metals (La, Ce, Nd, Sm, and Eu) for Fischer-Tropsch synthesis (FTS) were prepared by the coprecipitation method and characterized by XRD, N-2 adsorption, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, CO-temperature-programmed desorption (CO-TPD), H-2-TPD, CO2-TPD, and Mossbauer spectroscopy (MES). The results showed that all five rareearth metals could promote the performance of the catalysts, whereas the Nd promoter showed a unique promoting effect. The CO-TPD and MES results revealed that the sample FeMnNd had the highest CO chemisorption ability and formed the most Fe5C2, in the FTS reaction. Moreover, the sample FeMnNd achieved the strongest surface alkalinity and the weakest chemical adsorption of hydrogen, as confirmed by CO2-TPD and H-2-TPD, respectively. Based on the results of FTS performance, the FeMnNd catalyst exhibited the highest CO conversion of 74.9%, a C2-4 = selectivity of 36.0%, an 0/P ratio of 3.96, and the lowest C-5(+) selectivity of 34.3%.