Combining Electrochemical CO2 Capture with Catalytic Dry Methane Reforming in a Single Reactor for Low-Cost Syngas Production

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• 作者：Peng Zhang ; Jingjing Tong ; Kevin Huang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：7056-7065
• 全文大小：799K
• ISSN：2168-0485

文摘

We here report a potentially low-cost catalytic dry methane reforming process to make syngas with CO₂ electrochemically captured from a CO₂ source via a mixed conducting membrane in a single reactor. The mixed conducting electrochemical membrane is a composite comprising an O^2–-conductor and molten carbonate phase, where the catalytic bed contains a Ni-MgO-1 wt % Pt (NMP) or LaNi_0.6Fe_0.4O_3-δ (LNF) catalyst. The reactor with the NMP catalyst generally outperforms the LNF counterpart in CH₄ conversion rate and syngas production yield. At 850 °C and over the NMP catalyst, the membrane reactor yields a CO₂ permeation flux of 2.25 mL min^–1 cm^–2, a H₂ and CO production rate of 3.75 and 3.24 mL min^–1 cm^–2, respectively, and a CH₄ conversion of 93.9%. The LNF catalyst shows a long activation period due to the slow Ni ex-solution process but does offer a better coking and coarsening resistance. Long-term stability tests show no apparent sign of degradation within 200 h. With 3% H₂O added into methane, the reactor can produce a syngas with higher H₂/CO ratio preferable for liquid fuels synthesis. Overall, this work demonstrates the technical feasibility of a combined capture and conversion “all-in-one” CO₂ reactor for dry reforming of CH₄