文献类型：期刊文献

英文题名：Modified carbon nanotubes by KMnO4 supported iron Fischer-Tropsch catalyst for the direct conversion of syngas to lower olefins

作者：Wang, Di[1];Zhou, Xiangping[1];Ji, Jian[1];Duan, Xuezhi[1];Qian, Gang[1];Zhou, Xinggui[1];Chen, De[2];Yuan, Weikang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

年份：2015

卷号：3

期号：8

起止页码：4560

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20150800544609);WOS:【SCI-EXPANDED(收录号:WOS:000349667700055)】；

基金：This work was financially supported by the Natural Science Foundation of China (21306046) and the 111 Project of Ministry of Education of China (B08021).

语种：英文

外文关键词：Redox reactions - Potash - Metal nanoparticles - Nucleation - Carbon nanotubes - Iron - Synthesis gas - Catalyst supports - Yarn - Fischer-Tropsch synthesis - Manganese oxide

摘要：Manganese and potassium promoters coated carbon nanotubes (i.e., MnK-CNTs) were synthesized by a redox reaction between CNTs and KMnO4, in which the CNTs act as reducing agent and as substrate for the heterogeneous nucleation of K-doped manganese oxide. The as-synthesized MnK-CNTs were employed to support Fe catalyst (i.e., Fe/MnK-CNTs, the loadings of 7.9 wt% Fe, 15.7 wt% Mn and 1.9 wt% K) for the direct conversion of syngas to lower olefins. It is revealed that Fe/MnK-CNTs catalyst is more active and stable than FeMnK/CNTs catalyst prepared by co-impregnation method using CNTs as a support. Furthermore, under similar CO conversion, the Fe/MnK-CNTs catalyst exhibits higher selectivity of hydrocarbons especially lower olefins. This could be related to the small-sized and uniform nanoparticles, the well-distributed promoters, the weak metal-support interaction and the greater defects on support, which are the consequences of the unique structural transformation of MnK-CNTs as a function of temperature and atmosphere.