文献类型：期刊文献

英文题名：Probing The Structure Evolution of Iron-Based Fischer-Tropsch to Produce Olefins by Operando Raman Spectroscopy

作者：Fu, Donglong[1];Dai, Weiwei[1];Xu, Xinchao[1];Mao, Wei[1];Su, Junjie[1];Zhang, Zhengpai[1];Shi, Bianfang[1];Smith, Julian[1];Li, Ping[1];Xu, Jing[1];Han, Yi-Fan[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：7

期号：5

起止页码：752

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20150500481853);WOS:【SCI-EXPANDED(收录号:WOS:000350473500007)】；

基金：The authors are grateful to the support from the National Science Foundation (21176071, 21406062 and 21273070), the Program for New Century Excellent Talents in university (NCET-12-0852), and the Chinese Education Ministry 111 project (B08021)

语种：英文

外文关键词：Fischer-Tropsch; iron catalyst; operando analysis; Raman Spectroscopy; syngas

摘要：By using operando Raman spectroscopy (ORS), we investigated the panoramic structure evolution of an iron oxide (alpha-Fe2O3) catalyst, which is used for the production of olefins via Fischer-Tropsch (FTO). During activation in different atmospheres and reaction at 260 degrees C and 3.0 MPa, alpha-Fe2O3 was only partially transformed into gamma-Fe2O3 by H-2 pretreatment; meanwhile, a transformation of alpha-Fe2O3 -> gamma-Fe2O3 -> Fe3O4 -> Fe5C2 was observed in both CO and syngas (H-2/CO). Combining with other techniques such as XRD, TEM, XPS and TPSR, we reveal that assembles of various iron oxides (gamma-Fe2O3, Fe3O4, Fe carbide, and their combinations) are responsible for FTO. Especially, the preliminary relationship of catalyst structure and performance relating to the production of olefins directly from syngas was established. Such a study is critical for further understanding of the FTO reaction and other catalytic reactions.