The Effect of Mn, Al Doping on the CO2 Hydrogenation Performance of CaCO3‐Supported Fe‐Based Catalysts

Abstract With increasingly serious environmental problems caused by the greenhouse effect, it has also become essential to reduce the concentration of CO 2 in the atmosphere. In this paper, CaCO 3 ‐supported Fe‐based catalysts doped with Mn, Al, and K are prepared by a straightforward method and used for CO 2 hydrogenation. The fresh and spent catalysts were characterized by SEM‐EDS, BET, TG, CO 2 ‐TPD, XRD, and XPS. The experimental results show that the highest CO 2 conversion rate of Fe10Mn2Al10Ca is 35.99 %, the maximum FTY value is 293.98 μmol CO2 ⋅ ⋅ s −1 , the maximum O/P value is 6.61, and the lowest CO selectivity is 32.21 %. At the same time, according to the characterization results, the doping of Mn and Al increased the Fe 3 O 4 /FeC x ratio. As the Fe 3 O 4 /FeC x ratio increases, the proportion of short‐chain hydrocarbons (CH 4 , C 2–4 ) in the products increases, and the proportion of long‐chain hydrocarbons (C 5+ ) decrease. Therefore, the co‐doping of Mn and Al promotes the conversion of CO and reduces its selectivity, and promotes the formation of light olefins. Finally, it is hoped that this study can provide a reference for further research on CaCO 3 ‐supported Fe catalysts.