Dual Phase Membrane for High Temperature CO2 Separation Page: 5 of 19
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Extensive research has been done in the past decade on microporous inorganic
membrane for carbon dioxide (C02) separation. However, microporous inorganic membranes
only give high CO2 selectivity at low temperatures (> 350 C). Therefore, dense inorganic
membranes have been the focus of recent studies for high temperature CO2 separation processes
. It is known that molten carbonate mixtures, such as Li2CO3/K2C03, can conduct CO32- at a
very high rate. This concept is the basis of the molten carbonate fuel cell (MCFC). We proposed
a dual phase metal-carbonate dense membrane for high temperature CO2 separation. This
membrane consisted of a porous metal phase and a liquid carbonate phase, as shown in Figure 1.
Metal supports were used because the material can supply electrons to facilitate the reaction that
makes the concept of the dual-phase membrane possible. CO2 and 02 in the presence of an
electron rich environment have the tendency to ionize and form C032-
CO2 + I02 +2e- CO32-(1)
Separation can be accomplished with the driving force created by the CO2 partial
pressure gradient. On the upstream membrane surface C02, combining with electrons and
oxygen, formed CO32-, which transports through the molten carbonate phase. The CO32- releases
electrons to form CO2 and 02 on the downstream membrane surface. The electron transports
back, through the metal phase, towards the upstream membrane surface. No external electrodes
and connector are required in this dual phase membrane. Since only CO2 and 02 can transport
through the molten carbonate, the selectivity for CO2 over N2 or other gases is theoretically
We extended the dual-phase Co2 containing gas e
membrane concept to ceramic-carbonate 0)c-
membrane for improved oxidation / (molten crtonate)
resistance. Along this direction, we started coy removed as CO concentrated
prepared porous, electrically conductive, gas (CO, o)
lanthanum cobaltite (LaCoO3) perovskite Figure 1: Membrane Wall Cross-Sectional View
supports for oxidative resistant ceramic- Illustrating the Concept of Dual Phase Metal-
Carbonate Membrane for High Temperature CO2
carbonate dual-phase membranes for high Separation
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Lin, Jerry. Dual Phase Membrane for High Temperature CO2 Separation, report, June 30, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc927393/m1/5/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.