Synergistic effect of Fe-Mn bimetallic sites with close proximity for enhanced CO_(2) hydrogenation performance  

作　　者：Haoting Liang Qiao Zhao Shengkun Liu Chongyang Wei Yidan Wang Yue Wang Shouying Huang Xinbin Ma 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,Collaborative Innovation Center of Chemical Science and Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]School of Materials Science and Engineering,National Institute for Advanced Materials,TKL of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China [3]Zhejiang Institute of Tianjin University,Ningbo 315201,China [4]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第11期413-422,共10页化学科学与工程前沿（英文版）

基　　金：National Natural Science Foundation of China(Grant Nos.22378311,22108200,and 21938008);Natural Science Foundation of Zhejiang Province(Grant No.LQ22B060013).

摘　　要：The Fe-Mn bimetallic catalyst is a potential candidate for the conversion of CO_(2) into value-added chemicals.The interaction between the two metals plays a significant role in determining the catalytic performance,however which remains controversial.In this study,we aim to investigate the impact of tuning the proximity of Fe-Mn bimetallic catalysts with similar nanoparticle size.And its effect on the physicochemical properties of the catalysts and corresponding performance were investigated.It was found that closer Fe-Mn proximity resulted in enhanced CO_(2) hydrogenation activity and inhibited CH4 formation.The physiochemical properties of prepared catalysts were characterized using X-ray diffraction,H2 temperature programmed reduction,and X-ray photoelectron spectroscopy,revealing that a closer Fe-Mn distance promoted electron transfer from Mn to Fe,thereby facilitating Fe carburization.The adsorption behavior of CO_(2) and the identification of reaction intermediates were analyzed using CO_(2)-temperature programed desorption and in situ Fourier transform infrared spectroscopy,confirming the intimate Fe-Mn sites contributed to CO_(2) adsorption and the formation of HCOO*species,ultimately leading to increased CO_(2) conversion and hydrocarbon production.The discovery of a synergistic effect at the intimate Fe-Mn sites in this study provides valuable insights into the relationship between active sites and promoters.

关 键 词：CO_(2)hydrogenation Fe-based catalyst proximity effect Mn promoter 

分 类 号：O643.36[理学—物理化学]