文献类型：期刊文献

英文题名：Fabrication of K-promoted iron/carbon nanotubes composite catalysts for the Fischer-Tropsch synthesis of lower olefins

作者：Duan, Xuezhi[1];Wang, Di[1,2];Qian, Gang[1];Walmsley, John C.[3];Holmen, Anders[2];Chen, De[2];Zhou, Xinggui[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;[3]SINTEF Mat & Chem, N-7465 Trondheim, Norway

年份：2016

卷号：25

期号：2

起止页码：311

外文期刊名：JOURNAL OF ENERGY CHEMISTRY

收录：;EI(收录号：20161502224501);WOS:【SCI-EXPANDED(收录号:WOS:000375334900020)】；

基金：Di Wang is supported by the China Scholarship Council (CSC) for the research at Norwegian University of Science and Technology.This work was supported by the Natural Science Foundation of China (21306046), the Open Project of State Key Laboratory of Chemical Engineering (SKL-Che-15C03), the Fundamental Research Funds for the Central Universities (WA1514013) and the 111 Project of Ministry of Education of China (B08021).

语种：英文

外文关键词：Fischer-Tropsch synthesis; Lower olefins; Iron catalyst; Potassium promoter; Carbon nanotubes

摘要：K-promoted iron/carbon nanotubes composite (i.e., FeK-OX) was prepared by a redox reaction between carbon nanotubes and K2FeO4 followed by thermal treatments on a purpose as the Fischer-Tropsch catalyst for the direct conversion of syngas to lower olefins. Its catalytic behaviors were compared with those of the other two Fe-IM and FeK-IM catalysts prepared by impregnation method followed by thermal treatments. The novel FeK-OX composite catalyst is found to exhibit higher hydrocarbon selectivity, lower olefins selectivity and chain growth probability as well as better stability. The catalyst structure performance relationship has been established using multiple techniques including XRD, Raman, TEM and EDS elemental mapping. In addition, effects of additional potassium into the FeK-OX composite catalyst on the FTO performance were also investigated and discussed. Additional potassium promoters further endow the catalysts with higher yield of lower olefins. These results demonstrated that the introduction method of promoters and iron species plays a crucial role in the design and fabrication of highly active, selective and stable iron-based composite catalysts for the FTO reaction. (C) 2016 Science Press and Dalian Institute of Chemical Physics. All rights reserved.