Silver-molten carbonate composite as a new high-flux membrane for electrochemical separation of CO₂ from flue gas

详细信息	查看全文 | 推荐本文 |

• 作者：Nansheng Xu^a ; ^b ; Xue Li^a ; Maxwell A. Franks^c ; Hailei Zhao^b ; Kevin Huang^a ; ^{kevin.huang@sc.edu} ; ^{huang46@cec.sc.edu}
• 关键词：Gas separation ; Membrane ; Mixed conductor ; Flux density ; Chemical potential
• 刊名：Journal of Membrane Science
• 出版年：2012
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：15 May, 2012
• 卷：401-402
• 期：Complete
• 页码：190-194
• 文件大小：750 K

摘要

One of the major concerns of consuming fossil fuels to produce useful form of energy is the emission of CO₂, a greenhouse gas that can cause climate change and ultimately threaten the survival of humanity. Controlling CO₂-emission is an urgent but only practical solution to stabilize CO₂ concentration in the atmosphere. In this paper, we report our effort to capture CO₂ from a simulated flue gas by utilizing a dual-phase mixed carbonate-ion and electron conducting membrane, namely molten carbonate and silver. The obtained CO₂ and O₂ flux densities are the highest among the published metal-molten carbonate systems and relatively stable over 80-h period. The measured CO₂ and O₂ flux densities not only exhibit similar activation energy but also have the ratio of 2:1, favorably confirming the surface electrochemical reaction of CO₂ + 1/2O₂ + 2e鈥?#xA0;= CO₃^{2鈭?/sup>. These results demonstrate the Ag-MC dual-phase composite as a promising high-flux membrane for high-temperature electrochemical CO₂ separation from flue gas with high selectivity.}