低碳化学与化工2026，Vol.51Issue(2)：11-19,30,10.DOI:10.12434/j.issn.2097-2547.20250116
Mn或K修饰ε-Fe2C催化剂的制备及其费托合成性能研究
Study on preparation and Fischer-Tropsch synthesis performances of Mn or K modified ε-Fe2C catalysts
摘要
Abstract
Iron-based catalysts play a crucial role in Fischer-Tropsch Synthesis(FTS).However,their complex phase structures and high by-product selectivities limit further development.It is urgent to establish single-phase iron catalysts,explore the reaction processes and increase target product selectivities with promoters.Highly stable ε-Fe2C catalysts were successfully prepared by pyrolysis of Prussian Blue Analogues,and the effects of Mn and K promoters on the catalyst structures and catalytic performances were investigated.The results show that under reaction conditions of 270 ℃,3 MPa,n(H2):n(CO)=2:1,and gas hourly space velocity(GHSV)of 30000 mL/(g·h),with the Mn-modified ε-Fe2C catalyst,CO2 selectivity decreases to 7.5%,and with the K-modified ε-Fe2C catalyst,C5+hydrocarbon selectivity reaches 71.5%after 25 h reaction.The catalysts modified by the two promoters maintain ε-Fe2C structure before and after the reaction,and their activities and product selectivities remain stable during 80 h reaction.The Mn-modified ε-Fe2C catalyst exhibits better catalytic performance due to low by-product selectivity.By characterization methods such as XRD,TEM and XPS,the microstructural changes and their effects on FTS catalytic performances of the catalysts were revealed.It is found that the size effect produced by promoters results in a decrease in CO conversion rate with catalysts.Mn and K,as electronic promoters,provide electrons to the catalysts,ensuring the stability of the surface structures and regulating product distributions.The introduction of promoters into ε-Fe2C catalysts can effectively regulate catalytic activities and product distributions,providing a novel strategy for the development of FTS catalysts with high product selectivities.关键词
费托合成/碳化铁/助剂调控/烯烃Key words
Fischer-Tropsch synthesis/iron carbide/promoter regulation/olefins分类
化学化工引用本文复制引用
钱飞,魏子都,朱家欢,张超,相宏伟,刘兴武..Mn或K修饰ε-Fe2C催化剂的制备及其费托合成性能研究[J].低碳化学与化工,2026,51(2):11-19,30,10.基金项目
国家重点研发计划(2022YFB4101200,2022YFA1604100) （2022YFB4101200,2022YFA1604100）
国家自然科学基金面上项目(22172183) （22172183）
鄂尔多斯重点研发项目(YF20232316,YF20232317) （YF20232316,YF20232317）
国家自然科学基金杰出青年基金(22225206,22025804). （22225206,22025804）
