Effects of Loading and Doping on Iron-Based CO2 Hydrogenation Catalysts

摘要

Hydrogenation of CO2 to hydrocarbons is investigated over g-alumina iron-based catalysts to produce unsaturated hydrocarbons as feedstock chemicals for jet-fuel synthesis. It is shown that conversion levels up to 38% can be achieved by doping the iron with Mn. Furthermore, it was possible to obtain an olefin/paraffin ratio of over 1.16. The doping levels played a crucial role in the product distribution as well as CO2 conversion yields, with over doping leading to suppression of the desirable hydrocarbon products. Characterization of the catalysts by XRD, XPS, and SEM shed light on the role each dopant had on the overall catalyst's activity and production distribution.