کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
635003 | 1456085 | 2012 | 5 صفحه PDF | دانلود رایگان |
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′ = CO32−. 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.
► A new silver and molten carbonate dual-phase membrane for CO2 separation is reported for the first time.
► Highest CO2 flux density is achieved compared to all metal-molten carbonate systems reported.
► Excellent chemical compatibility between silver and molten carbonate.
► The permeation characteristics of CO2 and O2 confirm the electrochemical transport mechanism of electrons and carbonate-ions.
► Long-term flux behavior is interpreted by silver sintering mechanism.
Journal: Journal of Membrane Science - Volumes 401–402, 15 May 2012, Pages 190–194