Preparation and Performances of ZIF-67-Derived FeCo Bimetallic Catalysts for CO2 Hydrogenation to Light Olefins

Catalysts

Yajie Tian¹  Zichao Dong²  Bofeng Zhang²  Jie Zhao³  Yu Wu³ 

[1] College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China;Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;SINOPEC Research Institute of Petroleum Process, Beijing 100083, China;

关键词: CO₂ hydrogenation;    Co−Fe bimetallic catalyst;    N-doped;    Mӧssbauer spectroscopy;    ZIF-67;    pyrolysis of MOFs;   

DOI  :  10.3390/catal10040455

来源: DOAJ

【 摘 要 】

A novel sodium-promoted Fe-Co/NC catalyst prepared by incipient-wet-impregnation method using ZIF-67 as a support was employed to convert CO₂ to light olefins through hydrogenation reaction. Properties of the synthesized catalysts calcinated at various temperatures (from 400 to 700 °C) were investigated by XRD, SEM, TEM and Mӧssbauer spectroscopy. Characterization results showed that the support could be fully converted into carbon support above 500 °C, which could anchor metal particles, thus resulting in a uniform dispersion of active components. Furthermore, the Fe-Co alloy was formed during N₂ calcination, and was converted into active components, such as Fe₃O₄, Fe₅C₂, and Co₂C during the reaction. The reaction result indicated that FeCo/NC-600 catalyst exhibited the highest selectivity of light olefins (C₂= − C₄=, 27%) and CO₂ conversion could reach around 37% when this catalyst pyrolyzed at 600 °C in N₂. The highest selectivity for light olefins may be related to the combination of suitable particle size and sufficient active sites of iron carbide.

【 授权许可】

Unknown