文献类型：期刊文献

英文题名：Promotional effect of Mn-doping on the structure and performance of spinel ferrite microspheres for CO hydrogenation

作者：Shi, Bianfang[1];Zhang, Zhengpai[1];Liu, Yitao[1];Su, Junjie[1];Liu, Xianglin[1];Li, Xuning[2,3];Wang, Junhu[2,4];Zhu, Minghui[1];Yang, Zixu[1];Xu, Jing[1];Han, Yi-Fan[1,5]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China;[3]Nanyang Technol Univ, Sch Chem & Biomed Engn, 62 Nanyang Dr, Singapore 637459, Singapore;[4]Chinese Acad Sci, Mossbauer Effect Data Ctr, Dalian Inst Chem Phys, Dalian 116023, Peoples R China;[5]Zhengzhou Univ, Minist Educ, Engn Res Ctr Adv Funct Mat Mfg, Zhengzhou 450001, Peoples R China

年份：2020

卷号：381

起止页码：150

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20194707704284);WOS:【SCI-EXPANDED(收录号:WOS:000505022100016)】；

基金：National Key R&D Program of China (2018YFB0604501), National Science Foundation of China (21878080, 21576084, 21406062), and Fundamental Research Funds for the Central Universities (222201718002) are greatly acknowledged for funding this work.

语种：英文

外文关键词：Syngas; Fischer-Tropsch-to-olefins; Spinel ferrite; Fe-Mn microsphere; Structure evolution

摘要：A series of uniform microspheres of spinel-type Mn-doped ferrites (MnxFe(3-x)O(4)) with different Fe/Mn ratios were employed for the Fischer-Tropsch-to-olefins reaction (FTO). The highest selectivity of 54.4% and the space-time-yield (STY) of 73.0g.kg(cat)(-1).h(-1) to lower olefins (C-2-4(=)) were achieved over an Fe-Mn catalyst with 13 wt% Mn. A panoramic view of structure evolution of MnxFe3-xO4 was revealed using multiple in/ex situ techniques. We demonstrated that the expansion of lattice spacing induced by Mn exerted remarkable effects on the stabilization of MnxFe1-xO and epsilon-Fe2C during activation and reaction. Moreover, Mn endows Fe catalysts with strong surface basicity and consequently enhances the adsorption and dissociation of CO; while weakening the H availability and readsorption of olefinic intermediates. In addition, the impeded carburization of MnxFe1-xO and the reduction in particle size of catalysts jointly contribute to the volcano curve in the catalytic activity. The insights presented could guide the rational design of high performance catalysts via heteroatom doping. (C) 2019 Elsevier Inc. All rights reserved.