Understanding and identifying the oxygen transport mechanisms through a mixed-conductor membrane

Geffroy, Pierre-Marie; Blond, Éric; Richet, Nicolas; Chartier, Thierry

doi:10.1016/j.ces.2017.01.006

Cited by 62 publications

(38 citation statements)

References 55 publications

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“…A promising alternative way to separate oxygen from air, particularly on the small and medium scale, is the use of oxygen transport membranes (OTM), which consist of a mixed ionic and electronic conductor (MIEC). In MIEC materials, the oxygen permeation rate increases with temperature and the oxygen partial pressure gradient across the membrane [1]. Consequently, membrane performance is driven by adequate process parameters, such as the use of pressurized air on the feed side and an oxygen-lean sweep gas or vacuum on the permeate side [2].…”

Section: Introductionmentioning

confidence: 99%

Comparison of freeze-dried and tape-cast support microstructure on high-flux oxygen transport membrane performance

Schulze‐Küppers

Unije

Blank

et al. 2018

Journal of Membrane Science

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The overall permeation rate through asymmetric oxygen transport membranes is significantly governed by the porous support. Therefore, the microstructuring of the support's pore structure is essential to achieving the highest performances. Freeze casting is already proven to obtain hierarchical porous structures with low tortuosity, which potentially enhances the oxygen flux of oxygen transport membranes. Although a performance improvement has been reported, such improvement is not self-evident. There has yet to be a detailed comparison of the achieved microstructures in order to identify the relevant microstructural parameters. Asymmetric membranes from Ba0.5Sr0.5(Co0.8Fe0.2)0.97Zr0.03O3- consisting of a surface-activated 20 µm membrane layer with tape-or freeze-cast supports that have identical pore volume and layer thickness were manufactured, characterized, and compared by means of oxygen flux measurements. They were also microstructurally investigated via computed X-Ray tomography and flow simulation experiments. In the air/Ar gradient, the freeze-cast support membrane performs below the tape-cast-supported membrane. In particular, the transition zone close to the membrane, which is caused by the freezing process, significantly constrains the diffusivity and permeability of the support, and therefore leads to concentration polarizations. At temperatures below 800 °C, surface exchange kinetics at the membrane-support interface become rate-limiting.

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Section: Introductionmentioning

confidence: 99%

Comparison of freeze-dried and tape-cast support microstructure on high-flux oxygen transport membrane performance

Schulze‐Küppers

Unije

Blank

et al. 2018

Journal of Membrane Science

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“…A number of new oxygen storage materials have been discovered in recent years [6,[9][10][11][12][13][14][15][16][17][18][19][20]. The oxygen intake/ release in these non-stoichiometric oxygen storage oxides takes place through the following steps [21], (1) oxygen molecules are diffused to the surface, (2) dissociative adsorption through electron transfer, (3) diffusion of the oxide ions from surface to the lattice through an activated hopping mechanism. The diffusion of oxide ions through the material depends on the ease with which ions can move freely inside the lattice.…”

Section: Introductionmentioning

confidence: 99%

Rare earth barium cobaltites: potential candidates for low-temperature oxygen separation

Narayanan

Umarji

2020

SN Appl. Sci.

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Oxygen storage materials with low operating temperatures have gained attraction in oxygen separation and enrichment applications. Herein, YBaCo 2 O 6−x , Dy 0.5 Y 0.5 BaCo 2 O 6−x and DyBaCo 2 O 6−x are explored for low-temperature oxygen enrichment. These oxides were synthesized through solid-state reaction and the oxygen separation properties at various temperatures were studied using a home-built volumetric setup. The oxygen intake temperatures of the sample were found to vary depending upon the rare-earth cation size. The lowest absorption temperature of 523 K was observed for DyBaCo 2 O 6−x. Interestingly, DyBaCo 2 O 6−x had the largest saddle point radii through which oxide ion migration occurs. The effect of the synthesis method and microstructure on the oxygen holding capacity of DyBaCo 2 O 6−x has also been analyzed. For this, DyBaCo 2 O 6−x was synthesized through a combination of solution combustion synthesis followed by calcination and sintering at different temperatures. The particle size was found to have a profound effect on the oxygen intake of DyBaCo 2 O 6−x .

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“…Membrane operation in oxy-fuel combustion involves exposure to corrosive flue gases such as CO2 and SO2 environments. However, this technology is obstructed since most OTMs suffer from no permeation in the presence of corrosive flue gases such as CO2 and SO2 [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

High-flux dual-phase percolation membrane for oxygen separation

Wang

Shi

Xie

et al. 2019

Journal of the European Ceramic Society

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A series of composites based on (100-x)wt.%Ce0.9Pr0. 40 and 50) doped with the cheap and abundant alkaline earth metal Ca 2+ at the A-site has been successfully designed and fabricated. The crystal structure, oxygen permeability, phase and CO2 stability were evaluated. Thepossesses the highest oxygen permeability among three studied composites. At 1000 o C, the oxygen permeation fluxes through the 0.3 mm-thickness 60CPO-40PCFO membranes after porous La0.6Sr0.4CoO3-δ each to 1.00 mL cm -2 min -1 and 0.62 mL cm -2 min -1 under air/He and air/CO2 gradients, respectively. In situ XRD results demonstrated that the 60CPO-40PCFO sample displayed a perfect structural stability in air as well as CO2-containing atmosphere. Thus, low-cost, Co-free and Sr-free 60CPO-40PCFO has high CO2 stability and is economical and environmental friendly since the expensive and volatile element Co was replaced by Fe and Sr was waived since it easily forms carbonates.

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Understanding and identifying the oxygen transport mechanisms through a mixed-conductor membrane

Cited by 62 publications

References 55 publications

Comparison of freeze-dried and tape-cast support microstructure on high-flux oxygen transport membrane performance

Comparison of freeze-dried and tape-cast support microstructure on high-flux oxygen transport membrane performance

Rare earth barium cobaltites: potential candidates for low-temperature oxygen separation

High-flux dual-phase percolation membrane for oxygen separation

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