文献类型：期刊文献

英文题名：MnOx promotional effects on olefins synthesis directly from syngas over bimetallic Fe-MnOx/SiO2 catalysts

作者：Zhang, Zhengpai[1];Dai, Weiwei[1];Xu, Xin-Chao[1];Zhang, Jun[1];Shi, Bianfang[1];Xu, Jing[1];Tu, Weifeng[2];Han, Yi-Fan[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Zhengzhou Univ, Sch Chem Engn & Energy, Res Ctr Heterogeneous Catalysis & Engn Sci, Zhengzhou 450001, Henan, Peoples R China

年份：2017

卷号：63

期号：10

起止页码：4451

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20173604136573);WOS:【SCI-EXPANDED(收录号:WOS:000409146600017)】；

基金：The authors are grateful to the support from the National Science Foundation (21576084, 21406062, and 91534127), International Cooperation Project of Ministry of Science and Technology (2015DFG42570), Chinese Education Ministry 111 project (B08021).

语种：英文

外文关键词：syngas; Fischer-Tropsch to olefins; Fe-MnOx catalysts; intrinsic kinetics; mechanism

摘要：The direct synthesis of lower olefins via the Fischer-Tropsch reaction (FTO) has been performed over a series of Fe-MnOx/SiO2 catalysts. The addition of MnOx could improve the dispersion of iron species, and promote the reduction of iron oxide during the activation and subsequent carburization. Moreover, the results of characterization demonstrated that MnOx could enhance the surface basicity of the catalysts due to electronic effects and promote the formation of iron carbides. For the first time, the intrinsic power-law kinetics for FTO was obtained for both Fe-20/SiO2 and Fe-20-Mn-1/SiO2 catalysts. Kinetic parameters and structure characterizations indicated that MnOx could facilitate the CO dissociation on the catalyst surface, thus enhancing the adsorption strength and capacity of surface carbonaceous intermediates. The weak hydrogenation of carbonaceous species would boost the selectivities toward lower olefins. Finally, a plausible mechanism for FTO, involving the promotional effects of MnOx on Fe, has been proposed. (c) 2017 American Institute of Chemical Engineers AIChE J, 63: 4451-4464, 2017