文献类型：期刊文献

英文题名：Unraveling the Role of Zinc on Bimetallic Fe5C2-ZnO Catalysts for Highly Selective Carbon Dioxide Hydrogenation to High Carbon α-Olefins

作者：Zhang, Chao[1];Cao, Chenxi[1];Zhang, Yulong[1];Liu, Xianglin[1];Xu, Jing[1];Zhu, Minghui[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, Minist Educ, Engn Res Ctr Adv Funct Mat Mfg, Zhengzhou 450001, Henan, Peoples R China

年份：2021

卷号：11

期号：4

起止页码：2121

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20210709926975);WOS:【SCI-EXPANDED(收录号:WOS:000621598700021)】；

基金：National Natural Science Foundation of China (21878080, 21808058, and 21576084), Shanghai Sailing Program (18YF1406100), Fundamental Research Funds for the Central Universities (222201718002 and 222201814006), and Innovation Scientists and Technicians Troop Construction Projects of Henan Province are greatly acknowledged for funding this work.

语种：英文

外文关键词：CO2 hydrogenation; linear alpha-olefins; Fe-Zn catalysts; stabilization effect; phase transformation

摘要：In this work, Fe-Zn catalysts were prepared, characterized, and examined for the synthesis of linear high carbon alpha-olefins (LAOs; C = 4) directly from CO2 hydrogenation. The relationship of performance and structure has been established to unravel the role of ZnO in bimetallic Fe5C2-ZnO catalysts. A Fe2Zn1 catalyst showed high selectivity to C-2-C-7 olefins (a selectivity of 57.8% in gas phase) after 200 h of time-on-stream and total C4+ olefins selectivity in liquid products of 81.9% with 85.9% LAOs in C4+ alkenes at a CO2 conversion of 35.0%. The dominant mechanism of deactivation was ascribed to phase transformation from FeCx to FeOx in comparison with Fe2O3 and Fe5Zn1. Zn and Na were proved to migrate onto the surface during the activation process. The interaction between Zn and Na could suppress the oxidation of FeCx by H2O and CO2. This study revealed the deactivation mechanism and stabilization effects of Zn on the active phase of FeCx during CO2 hydrogenation.