Composite CO2 separation membranes: Insights on kinetics and stability

Patrício, Sónia G.; Papaioannou, Evangelos I.; Ray, B.; Metcalfe, Ian S.; Marques, F.M.B.

doi:10.1016/j.memsci.2017.07.008

Cited by 21 publications

(24 citation statements)

References 43 publications

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“…MACs have also been used for preparing CO 2 separation membranes on several supports. 28,29,30 The development of MACs -based membranes for industrial applications, especially for carbon capture purposes, could be extended if 2D materials such as graphene were considered as suitable supports for the MACs. Graphene -based membranes for CO 2 separation purposes have been considered in the literature both using neat graphene as separation media, i.e.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on Molten Alkali Carbonate Interfaces

Gutiérrez

Garroni

Souentie³

et al. 2018

Langmuir

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The properties and structure of relevant interfaces involving molten alkali carbonates are studied using molecular dynamics simulations. Lithium carbonate and the Li/Na/K carbonate eutectic mixture are considered. Gas phase composed of pure CO 2 or a model flue gas mixture are analysed. Likewise, the adsorption of these gas phases on graphene are studied, showing competitive CO 2 and N 2 adsorption that develops liquid-like layers and damped oscillation behaviour for density. The interaction of the studied carbonates with graphene is also characterized by development of adsorption layers through strong graphene-carbonate interactions and the development of hexagonal lattice arrangements, especially for lithium carbonate. The development of molten salts-vacuum interfaces is also considered, analysing the ionic rearrangement in the interfacial region. The behaviour of the selected gas phases on top of molten alkyl carbonate is also studied, showing the preferential adsorption of CO 2 molecules when flue gases are considered.

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Section: Introductionmentioning

confidence: 99%

Theoretical Study on Molten Alkali Carbonate Interfaces

Gutiérrez

Garroni

Souentie³

et al. 2018

Langmuir

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“…The ambipolar conductivity ( a ) is defined as a function of partial conductivity of the ionic and electronic conducting phases within the membrane composites [20,21]…”

Section: Methodsmentioning

confidence: 99%

“…The ionic transport number (t i ) and electronic transport number (t e ) are defined by Eqs. (3) and (4), respectively [20][21][22][23]…”

Section: Methodsmentioning

confidence: 99%

Phase and microstructural characterizations for Ce0.8Gd0.2O2--FeCo2O4 dual phase oxygen transport membranes

Zeng

Malzbender

Baumann

et al. 2020

Journal of the European Ceramic Society

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Dual phase oxygen transport membranes were prepared via solid state reaction at 1200 ℃. The sintered membranes were characterized via X-ray diffraction, back scattered electron microscopy and electron backscatter diffraction, and associated with image analysis and calculations to quantify phase compositions and microstructural features including volume fractions, grain sizes, and contiguity. The characterizations reveal a multi-phase system containing Ce 1-x Gd x O 2-δ' (x ≈ 0.1) (CGO10), and Fe y Co 3-y O 4 (0.2 < y < 1.2) (FCO), CoO and Gd 0.85 Ce 0.15 Fe 0.75 Co 0.25 O 3 (GCFCO) in the sintered membranes. In addition, a novel model is utilized to assess the evolution of the ambipolar conductivity with respect to microstructural features. Both experimental and calculated results indicate that if the grain sizes of all phases in the composites are similar, the optimal ambipolar conductivity is reached with a volume ratio of ionic conducting phase to electronic conducting phase close to 4:1. Meanwhile, the GCFCO phase dominates the effective electronic conductivity.

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“…Recent technologies aiming at the separation of CO 2 from flue gases exploited the performance of MCFCs operating in the electrolytic or in the traditional galvanic mode, in order to remove this gas, namely, by reduction to C or taking advantage of the net CO 3 2− ionic transport via molten carbonates in MCFCs 9‐14 . Other technologies used in CO 2 separation membranes rely on net ambipolar counter transport of CO 3 2− and O 2− ions across two distinct electrolytes, the molten salt and a ceramic oxide‐ion conductor, often based on ceria 15‐19 . While these membranes can operate without electrodes, some surface electronic conductivity would favor the delocalization of surface reactions and enhance the membrane separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Electrode protective barrier layers for molten carbonate confinement

2020

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Summary Pure NiO or lithiated NiO with distinct Li/Ni atomic proportions (50/50—LN55 and 30/70—LN37) were tested as protective barrier layers (PBLs) to enhance the stability of LaCoO3 (LC) electrodes in cells with composite electrolytes (CEs) consisting of Gd‐doped ceria (CGO) and a eutectic mixture of Na and Li carbonates (NLCs). PBLs and LC layers were sequentially deposited by screen printing before firing at 700°C and 550°C, respectively, to yield symmetrical cells (LC|PBL|CE|PBL|LC). Electrochemical testing involved impedance spectroscopy measurements in air in the 500°C to 650°C range. Scanning electron microscopy combined with energy‐dispersive X‐ray spectroscopy (SEM/EDS) revealed that distinct PBLs possess uneven wetting tendency, with impact on the role of LC layers. The best electrode performance (0.55 Ω cm2 electrode area specific resistance at 550°C in air) was observed using the LN37 PBL, stable throughout endurance tests up to 200 hours. Possible electrode mechanisms consistent with experimental evidence suggest an active role of the molten phase as an intermediate provider of O2− transport between the electrode and CGO.

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Composite CO2 separation membranes: Insights on kinetics and stability

Cited by 21 publications

References 43 publications

Theoretical Study on Molten Alkali Carbonate Interfaces

Theoretical Study on Molten Alkali Carbonate Interfaces

Phase and microstructural characterizations for Ce0.8Gd0.2O2--FeCo2O4 dual phase oxygen transport membranes

Electrode protective barrier layers for molten carbonate confinement

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