Effect of preparation methods on the structure and catalytic performance of Fe–Zn/K catalysts for CO2 hydrogenation to light olefins

作     者：Xu Wang Jianli Zhang Jingyu Chen Qingxiang Ma Subing Fan Tiansheng Zhao 

作者机构：State Key Laboratory of High-effidency Utilization of Coal and Green Chemical Engineering College of Chemistry & Chemical Engineering Ningxia University Yinchuan 750021 China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2018年第26卷第4期

页      面：761-767页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supports by the National Natural Science Foundation of China(21666030,21366025) National First-rate Discipline Construction Project of Ningxia(NXYLXK2017A04) 

主　　题：CO2 hydrogenation Light olefins Preparation methods Iron–zinc catalyst 

摘      要：Potassium promoted iron–zinc catalysts prepared by co-precipitation method(C–Fe–Zn/K),solvothermal method(S–Fe–Zn/K)and hydrothermal method(H–Fe–Zn/K)could selectively convert CO_2to light olefins,*** physicochemical properties of the obtained catalysts were determined by SEM,N_2physisorption,XRD,H_2-TPR,CO_2-TPD and XPS *** results demonstrated that preparation methods had great influences on the morphology,phase structures,reduction and adsorption behavior,and hence the catalytic performance of the *** samples prepared by hydrothermal and co-precipitation method generated small uniform particles and led to lower specific surface *** contrast,microspheres with larger specific surface area were formed by self-assembly of nanosheets using solvothermal ***_2O_4was the only detectable phase in the fresh C–2Fe–1Zn/K,S–3Fe–1Zn/K and S–2Fe–1Zn/K ***_2O_4and ZnO co-existed with increasing Zncontent in S–1Fe–1Zn/K sample,while ZnO and Fe_2O_3could be observed over H–2Fe–1Zn/K *** the used samples contained Fe_3O_4,ZnO and Fe_5C_*** peak intensity of ZnO was strong in the AR-H–2Fe–1Zn/K sample while it was the lowest in the AR-C–2Fe–1Zn/K sample after *** formation of ZnFe_2O_4increased the interaction between iron and zinc for C–2Fe–1Zn/K and S–Fe–Zn/K samples,causing easier reduction of Fe_2O_3to Fe_3O_*** surface basicity of the sample prepared by co-precipitation method was much more than that of the other two *** CO_2hydrogenation,all the catalysts showed good activity and olefin *** CO selectivity was increased with increasing Zncontent over S–Fe–Zn/K samples.H–2Fe–1Zn/K catalyst preferred to the production of C_5^+***_2conversion of 54.76%and C_2~=–C_4~=contents of 57.38%were obtained on C–2Fe–1Zn/K sample,respectively.