文献类型：期刊文献

英文题名：Promotional effects of multiwalled carbon nanotubes on iron catalysts for Fischer-Tropsch to olefins

作者：Zhang, Zhengpai[1];Zhang, Jun[1];Wang, Xu[2];Si, Rui[2];Xu, Jing[1];Han, Yi-Fan[1,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China;[3]Zhengzhou Univ, Sch Chem Engn & Energy, Res Ctr Heterogeneous Catalysis & Engn Sci, Zhengzhou 450001, Henan, Peoples R China

年份：2018

卷号：365

起止页码：71

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20182705407894);WOS:【SCI-EXPANDED(收录号:WOS:000442976400010)】；

基金：The National Science Foundation (21576084, 91534127, and U1463205), the Fundamental Research Funds for the Central Universities (222201718002), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province, and the National Key R&D Program of China (2018YFB0604501) are gratefully acknowledged for funding this work. 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：Iron nanoparticles; Fischer-Tropsch; Olefins; FTO; Multiwalled carbon nanotube; Surface modification; Metal-support interaction

摘要：N,O-functionalized and high-temperature-treated carbon nanotubes (N, O, HT-CNTs) were employed to investigate the promotional effects of CNT on Fe catalysts for the Fischer-Tropsch-to-olefins (FTO); particularly, the origin of active sites was explored using multiple in/ex situ techniques. An upward trend in initial activity, olefin selectivity, olefin/paraffin ratio, and chain growth probability is observed in the sequence of O-, N-, and HT-CNT supported catalysts. Unexpectedly, Fe/HT-CNT exhibits superb selectivity of 72.4% to C-2-C-7 olefins, closing to the Anderson-Schulz-Flory (ASF) limit. The defect-rich electron withdrawing HT-CNT weakens the reducibility of FeOx and the C3H6 adsorption on Fe, in contrast to O-, N-CNT. The defect-anchored Fe/HT-CNT promotes "Fe-C" formation and phase transformation toward epsilon-Fe2.2C/epsilon-Fe2C, improving CO adsorption and activation. The above merits boost olefin selectivity on Fe/HT-CNT. However, O-CNT abounded with O groups retards the formation and deep carbonization of the active phase, indicating a gradual increase in the yield. (C) 2018 Elsevier Inc. All rights reserved.