CO2 hydrogenation to hydrocarbons over alumina-supported iron catalyst: Effect of support pore size. (May 2017)

• Record Type: Journal Article
• Authors: Xie, Tianze; Wang, Jianyang; Ding, Fanshu; Zhang, Anfeng; Li, Wenhui; Guo, Xinwen; Song, Chunshan
• Is Part Of: Journal of CO₂ utilization. Volume 19(2017)
• Page Start: 202
• Page End: 208
• Publication Date: 2017-05
• Subjects: CO2 hydrogenation -- Alumina -- Pore size -- Particle size; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2017.03.022
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: Alumina supports with a wide range of pore size were prepared. Support pore size controls the size of Fe2 O3 particles. Optimum Fe2 O3 particle size will lead to the highest selectivity to C5 + hydrocarbons from CC chain growth. Abstract: The effect of support pore size of FeK/Al2 O3 catalysts on the catalytic performance in CO2 hydrogenation reaction was investigated. A total of 8 iron-based catalysts supported on alumina with different pore size were prepared by incipient wetness impregnation where the amount of Fe and K were fixed at 15 and 10 wt%, respectively. N2 adsorption/desorption, XRD, TPR and PZC were used to characterize the supports and catalysts. The results show that the support pore size impacts the size of Fe2 O3 particles formed in the catalyst; increasing pore size of Al2 O3 supports led to increased size of Fe2 O3 particles formed in the pores. Catalyst pore sizes of 7–10 nm and the corresponding Fe2 O3 particle sizes of 5–8 nm were the most active for CO2 hydrogenation to hydrocarbons. Outside this range, larger pore size further decrease the iron dispersion and reduce the number of active sites; smaller pore size is not favorable on account of the too small Fe2 O3 particle sizes and lower reducibility of the small particle.