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

The effect of support pore size of FeK/Al 2 O 3 catalysts on the catalytic performance in CO 2 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 Fe 2 O 3 particles formed in the catalyst; increasing pore size of Al 2 O 3 supports led to increased size of Fe 2 O 3 particles formed in the pores. Catalyst pore sizes of 7–10   nm and the corresponding Fe 2 O 3 particle sizes of 5–8   nm were the most active for CO 2 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 Fe 2 O 3 particle sizes and lower reducibility of the small particle.