文献类型：期刊文献

英文题名：Unravelling the metal-support interactions in χ-Fe5C2/MgO catalysts for olefin synthesis directly from syngas

作者：Liu, Yitao[1];Liu, Xianglin[1];Yang, Zixu[1];Li, Hu[1];Ding, Xiaoxu[1];Xu, Minjie[1];Li, Xinli[2];Tu, Wei-Feng[2];Zhu, Minghui[1];Han, Yi-Fan[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Zhengzhou Univ, Engn Res Ctr Adv Funct Mat Mfg, Minist Educ, Zhengzhou 450001, Peoples R China

年份：2022

卷号：12

期号：3

起止页码：762

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20220711647912);WOS:【SCI-EXPANDED(收录号:WOS:000732863500001)】；

基金：The authors greatly acknowledge the funding support from the National Science Foundation (21878080), the Shanghai Sailing Program (19YF1411000), the China Postdoctoral Science Foundation (2018 M641034), the Fundamental Research Funds for the Central Universities (222201814006) and the Ningxia Science Foundation (2019AAC03282).

语种：英文

外文关键词：Photodissociation - Synthesis gas - Catalyst selectivity - Iron - Magnesia - Iron compounds

摘要：We reported a chi-Fe5C2/MgO catalyst for olefin synthesis directly from syngas (STO), showing high selectivity to C-2-C-4 olefins and catalytic stability. With characterization of the morphology, electronic structures, and adsorption/desorption properties using in/ex situ techniques (XPS, TEM, XRD, MES, PHTA and TPD), we revealed that MgO could act not only as a structural promoter to disperse the active iron phase and prevent particle agglomeration during the reaction, but also as an electronic modifier to transfer electrons to iron. In particular, by combination of spectroscopy and theory calculations, we have proved that the close intimacy between chi-Fe5C2 and MgO (similar to 0.3 electrons transfer from MgO to chi-Fe5C2) enhanced CO dissociative adsorption whilst weakening the secondary hydrogenation of olefins, leading to the enhancement of selectivity. The dual roles of MgO in chi-Fe5C2/MgO may shed light upon rational design of practical STO catalysts by taking advantage of the exceptional strong metal-support interactions (SMSIs).