CO2 hydrogenation directly producing value added chemicals over Fe based catalysts is an important approach to achieve its resource-oriented utilization. In this work

ZSM-5 supported iron catalysts with different ratios of Si/Al (25

70

150) were prepared by conventional impregnation method and the effects of supports with different Si/Al ratios on the catalytic performance were investigated. The catalyst activity increased first

then decreased with the increase of Si/Al ratio

and the optimal ratio of Si/Al was 70. With the combination of CO2-DRIFTS and CO2-TPD

it was found that ZSM-5 (Si/Al=70) zeolite supported Fe catalyst possessed more and stronger basic sites

which promoted the dissociative activation of CO2. The evolution of catalysts structure was explored using multiple techniques such as H2-TPR

XRD and Raman spectroscopy. After reduction

Fe2O3 on the catalyst surface was converted into metallic iron

which was then transferred to Fe3O4 and FeCx during the reaction. It was also found that the discrepancy in the interaction between Fe and C under different coordination environments (Si/Al) affects the formation of FeCx

thereby affecting the activity and products selectivity of CO2 hydrogenation.