文献类型：期刊文献

英文题名：Uncovering the electronic effects of zinc on the structure of Fe5C2-ZnO catalysts for CO2 hydrogenation to linear α-olefins

作者：Zhang, Chao[1];Xu, Minjie[1];Yang, Zixu[1];Zhu, Minghui[1];Gao, Jian[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, Engn Res Ctr Adv Funct Mat Mfg, Minist Educ, Zhengzhou 450001, Peoples R China

年份：2021

卷号：295

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20212010351081);WOS:【SCI-EXPANDED(收录号:WOS:000663321000003)】；

基金：This work was supported by the 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 InnovationScientists 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; Fe5C2-ZnO catalyst; Chemical state; Electronic effect

摘要：The performance of Fe-based catalysts has found to be remarkably improved by the addition of ZnO in the reaction of CO2 hydrogenation to linear a-olefins (LAO). The space time yield (STY) of C4-20 alpha-olefins for bimetallic Fe2Zn1 is 2.4 times of the Fe alone; while a C4-20 olefins selectivity of 60.7 % with an 89.3 % LAOs/olefins ratio in C4-20 alkenes at a CO2 conversion of 43.5 % was achieved as well. Using in situ X-ray photon spectroscopy (XPS), we have proved that the chemical state of Zn varied between 0 and +2 (Zn delta+), accompanying by electronic donating from ZnOx to Fe. Focusing on electronic effects, we revealed the structure evolution during the induction period. The introduction of ZnO changed the ratios of FeCx/FeOx during the reaction. This study uncovered the chemical valence of Zn for CO2 to LAOs and its effects on the structure of active sites and the performance of Fe5C2-ZnO catalysts.