Title of Paper:CO2 hydrogenation to hydrocarbons over alumina-supported iron catalyst: Effect of support pore size

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Date of Publication:2017-05-01

Journal:JOURNAL OF CO2 UTILIZATION

Included Journals:SCIE、EI、Scopus

Volume:19

Page Number:202-208

ISSN No.:2212-9820

Key Words:CO2 hydrogenation; Alumina; Pore size; Particle size

Abstract:The effect of support pore size of FeK/Al2O3 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. N-2 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 Fe2O3 particles formed in the catalyst; increasing pore size of Al2O3 supports led to increased size of Fe2O3 particles formed in the pores. Catalyst pore sizes of 7-10 nm and the corresponding Fe2O3 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 Fe2O3 particle sizes and lower reducibility of the small particle.