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The rare earth elements modified FeK/Al2O3 catalysts for direct CO2 hydrogenation to liquid hydrocarbons

Lei Zhang,Hao Wang,Chengguang Yang,Xiaopeng Li,Jian Sun,Hui Wang,Peng Gao,Yuhan Sun

The present work reports on the promoting effects of rare earth elements (La, Ce and Y) to FeK/Al 2 O 3 catalysts on liquid hydrocarbons from CO 2 hydrogenation. The addition of La, Ce and Y can both improve the selectivity of C 5+ hydrocarbons and reduce the selectivity of CH 4 . The C 5+ selectivity can enhance to about 60 % with CH 4 selectivity of around 11 % at CO 2 conversions above 20 %. N 2 adsorption–desorption, in situ XRD, H 2 –TPR, CO 2 /H 2 –TPD, HRTEM and XPS are used to characterize the FeK/Al 2 O 3 and FeK/M-Al 2 O 3 (M = La, Ce, Y) catalysts. The results show that the introduction of rare earth elements into the FeK/Al 2 O 3 catalyst obviously reduces the adsorption of H 2 , which suppresses the CH 4 formation. On the other hand, rare earth elements also promote the adsorbed CO 2 species, which leads to the enhanced liquid hydrocarbons selectivity. Finally, the tailored CO 2 /H 2 ratio of CO 2 and H 2 adsorption on the catalyst surface can influence the catalyst activity and the product selectivity evidently.