An asymmetric tubular ceramic-carbonate dual phase membrane for high temperature CO2 separation

Dong, Xueliang; Landeros, José Ortiz; Lin, Jerry Y S

doi:10.1039/c3cc45949g

Cited by 69 publications

(56 citation statements)

References 26 publications

(10 reference statements)

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“…29 From the equilibrium 4OH(g) ⇔ O 2 (g) + 2H 2 O(g), [9] the emf related to OH − for small gradients can be expressed as: Approaches to correction for electrode polarization.-If the transport number of native ions is not unity, there will be a significant transport number of electrons or some foreign ionic species. A chemical gradient will then result in a net flux by ambipolar transport through the sample.…”

Section: Transport Number Measurementsmentioning

confidence: 99%

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Xing

Norby

2015

J. Electrochem. Soc.

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Dense dual-phase membranes consisting of a molten carbonate embedded in the interconnected pores of a ceramic framework are considered for potential application in CO 2 separation at elevated temperatures utilising ambipolar conduction of carbonate ions and other charge carriers in the molten or solid phase. We have developed an experimental setup for determining transport numbers of various species in the molten carbonate phase by means of electromotive force (emf) measurements. Transport numbers of native and foreign ions are characterized for the eutectic mixture of Li-Na-K carbonate, which is embedded in a porous alumina matrix with Pt or lithiated NiO electrodes. The voltage is measured under activity gradients of CO 2 , O 2 , or H 2 O at 550 • C. Electrochemical impedance spectra are collected during emf measurements. The true transport numbers of both native and foreign ions are calculated by taking into account the electrode polarization. The corrected transport numbers of native (carbonate and alkali metal) ions are close to unity at 550 • C based on the emf under a p C O 2 gradient. Minor transport of oxide ions and hydroxide ions in the molten carbonate is observed under a p O 2 gradient and p H 2 O gradient, respectively. This offers an alternative understanding and operation of molten carbonate dual-phase membranes.Molten carbonates have been characterized with respect to their electrochemical properties and performances in molten carbonate fuel cells (MCFCs). 1-4 Recently, molten carbonates have also been considered together with a mixed electron oxide-ion conducting ceramic in dense dual-phase CO 2 separation membranes. [5][6][7][8][9][10][11][12][13][14][15][16] The principle is to utilize both the transport of carbonate ions in the molten carbonate phase and the transport of oxide ions and/or electrons in the ceramic phase for achieving a high ambipolar transport of CO 2 . Using such dual-phase membranes, it is thus possible to separate CO 2 from a multicomponent gas stream (e.g. that also contains N 2 and/or H 2 ) at high temperature with high selectivity.There are already several reports on the effect of different ceramic phases (alumina, yttria-stabilized zirconia, gadolinia-doped ceria, lanthanum-strontium-cobalt-iron oxide) on the flux of the dualphase membranes, 5,7,8,10,13,14 wherein the influence of the microstructure, the ratio of the two phases, and the wettability of the ceramic surface were investigated. Other publications focused on modelling the above-mentioned properties of such dual-phase membranes in order to investigate the effect of pressure and the presence of oxygen in the flue gas on the surface reaction and bulk conductivity. 11,12,15,17 More recent papers describe the characteristics of thin membranes 18,19 and also the fabrication of asymmetric tubular membranes 9 or hollow fibre membranes. 20 Besides the application in dense membranes, some studies presented the use of ceramic-carbonate nanocomposites as electrolytes in intermediate-temperature solid oxide fuel cells (SO...

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Section: Transport Number Measurementsmentioning

confidence: 99%

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Xing

Norby

2015

J. Electrochem. Soc.

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“…[11][12][13][14][15][16][17][18][19] The first class is a mixed oxide-ion and carbonate-ion conductor (MOCC) comprised of an oxide and carbonate phase. The second class is a mixed electron and carbonate-ion conductor (MECC) consisted of a metal and carbonate phase.…”

mentioning

confidence: 99%

“…Within the two new electrochemical membranes, the MECC membrane technology is of particular interest because of its ability to capture CO 2 from a flue gas stream emitted from coal-fired power plants; [17][18][19] the latter is one of the major industrial emitters of CO 2 . However, our previous work showed that the flux of MECC membranes was unstable for a longer period of time to have any practical implications.…”

mentioning

confidence: 99%

Stabilizing electrochemical carbon capture membrane with Al₂O₃ thin-film overcoating synthesized by chemical vapor deposition

Tong

Zhang

et al. 2015

Chem. Commun.

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“…The membrane module also demonstrated good long-term stability in actual coal-derived syngas streams with 320 ppm H 2 S. The polymeric membranes cannot be used at high temperatures. The membranes with reduced thickness prepared in tubular geometry (Dong, Ortiz-Landeros, & Lin, 2013) showed improved CO 2 permeance at temperatures above 800 K. Anderson and Lin (2013) demonstrated the use of such a dual-phase membrane for hydrogen (syngas) production by dry-reforming. The membranes permeate CO 2 with O 2 , but not other gases at temperatures above 700 K. However, the membranes are not stable because stainless steel can be oxidized and also reacts with molten carbonate.…”

Section: Co 2 -Selective Membranesmentioning

confidence: 96%

Membrane reactors for hydrogen production from coal

Dong

Lin

2015

Membrane Reactors for Energy Applications and Basic Chemical Production

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An asymmetric tubular ceramic-carbonate dual phase membrane for high temperature CO2 separation

Abstract: For the first time, a tubular asymmetric ceramic-carbonate dual phase membrane was prepared by a centrifugal casting technique and used for high temperature CO2 separation. This membrane shows high CO2 permeation flux and permeance.

Cited by 69 publications

References 26 publications

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Stabilizing electrochemical carbon capture membrane with Al₂O₃ thin-film overcoating synthesized by chemical vapor deposition

Membrane reactors for hydrogen production from coal

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An asymmetric tubular ceramic-carbonate dual phase membrane for high temperature CO2 separation

Abstract: For the first time, a tubular asymmetric ceramic-carbonate dual phase membrane was prepared by a centrifugal casting technique and used for high temperature CO2 separation. This membrane shows high CO2 permeation flux and permeance.

Cited by 69 publications

References 26 publications

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Electromotive Force (emf) Determination of Transport Numbers for Native and Foreign Ions in Molten Alkali Metal Carbonates

Stabilizing electrochemical carbon capture membrane with Al2O3 thin-film overcoating synthesized by chemical vapor deposition

Membrane reactors for hydrogen production from coal

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Product

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Stabilizing electrochemical carbon capture membrane with Al₂O₃ thin-film overcoating synthesized by chemical vapor deposition