Hydrocarbon Synthesis from Carbon Dioxide and Hydrogen: A Two-Step Process
2013
Drab, David M. | Willauer, Heather D. | Olsen, Matthew T. | Ananth, Ramagopal | Mushrush, George W. | Baldwin, Jeffrey W. | Hardy, Dennis R. | Williams, Frederick W.
CO₂ hydrogenation to olefins and ethylene oligomerization were investigated in efforts to improve catalyst composition and reaction conditions needed for scale-up. The hydrogenation of CO₂ to hydrocarbons is investigated over γ-alumina-supported iron-based catalysts modified with manganese and potassium promoters and a silica-stabilized coating under fixed-bed reactor conditions to produce unsaturated hydrocarbons as feedstock chemicals for jet fuel synthesis. The stabilizer is introduced by impregnating the K/Mn/Fe on Al₂O₃ catalyst with tetraethylorthosilicate (TEOS) to minimize the deactivating effects of water on catalyst activity in CO₂ hydrogenation. The K/Mn/Fe on Al₂O₃ catalyst modified with the TEOS and reduced in CO produced a lighter end fraction of olefins compared to the catalyst reduced in H₂. To increase the chain length of the olefins formed in the CO₂ hydrogenation step, investigation of the oligomerization reaction is conducted in a separate experiment, where pure ethylene is used as a model olefin. Ethylene oligomerization over pelletized amorphous silica–alumina (ASA)-supported Ni catalysts demonstrated high conversion and selectivity toward the jet fuel fraction (C₈–C₁₆) at a very low mass hourly space velocity (MHSV).
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