文献类型：期刊文献

英文题名：Chemical and structural properties of Na decorated Fe5C2-ZnO catalysts during hydrogenation of CO2 to linear α-olefins

作者：Tu, Weifeng[1];Sun, Chao[1];Zhang, Zhengzhou[1];Liu, Wenqi[1];Malhi, Haripal Singh[1];Ma, Wei[1];Zhu, Minghui[2];Han, Yi-Fan[1,2]

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

年份：2021

卷号：298

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

收录：;EI(收录号：20213210726758);WOS:【SCI-EXPANDED(收录号:WOS:000702285900005)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant no. 22078307, 21606208) and Henan Province funds for Innovative Research Team in University (in Science and Technology) (18IRTSTHN001). We also acknowledge the Natural Science Foundation of Henan Province (202300410432) and the State Key Laboratory of Coal Conversion (J21-22-902).

语种：英文

外文关键词：CO2 hydrogenation; Linear alpha-olefins; Sodium effects; Fe5C2-ZnO catalysts; Dynamic phase transition; Surface identities

摘要：This work unravels the chemical and structural properties of Fe5C2-ZnO catalysts decorated with sodium (Na) during CO2 hydrogenation to linear alpha-olefins, determined by rate assessments and series of in-situ characterizations. Reaction network remains as a combination of reverse water-gas-shift (RWGS) and CO hydrogenation, but their relative contributions vary. The RWGS reaction is chemically equilibrated, thus CO2 conversion is determined solely by the thermodynamic constraint. However, Na addition alleviates the formation rates of paraffins from the subsequent CO hydrogenation and reactions of olefins with hydrogen. Na additive does not alter the structures of Fe5C2-ZnO, but improves largely the stability of Fe5C2 by preventing the phase oxidation during the reaction. Na modifies the surface properties of catalyst, thus facilitates reaction of CO* and H* and the C-C bond formation. The dual role of Na leads more effective olefins turnovers and provides new insights to the design of novel catalysts for CO2 utilization.