Hydrocarbon Synthesis from Carbon Dioxide and Hydrogen: A Two-Step Process

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• 作者：David M. Drab ; Heather D. Willauer ; Matthew T. Olsen ; Ramagopal Ananth ; George W. Mushrush ; Jeffrey W. Baldwin ; Dennis R. Hardy ; Frederick W. Williams
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：27
• 期：11
• 页码：6348-6354
• 全文大小：274K
• 年卷期：v.27,no.11(November 21, 2013)
• ISSN：1520-5029

文摘

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 纬-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鈥揳lumina (ASA)-supported Ni catalysts demonstrated high conversion and selectivity toward the jet fuel fraction (C₈鈥揅₁₆) at a very low mass hourly space velocity (MHSV).