Enhanced Oxygen Separation through Robust Freeze‐Cast Bilayered Dual‐Phase Membranes

Gaudillere, Cyril; García‐Fayos, Julio; Balaguer, María; Serra, José M.

doi:10.1002/cssc.201402324

Cited by 54 publications

(40 citation statements)

References 42 publications

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“…Both will reduce the oxygen flux through the membrane. In order to compensate the material creep, a smart design of the support might be an option as reported for a new generation of supports with straight pore channels perpendicular to the load direction, manufactured by freeze drying [24]. …”

Section: Discussionmentioning

confidence: 99%

Creep behavior of porous La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membrane supports

Zou

Schulze‐Küppers

Malzbender

2015

Ceramics International

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Section: Discussionmentioning

confidence: 99%

Creep behavior of porous La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membrane supports

Zou

Schulze‐Küppers

Malzbender

2015

Ceramics International

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“…Further research into the composite formulation and the deposition of thesem aterials as thin layers on porouss upports [46] could lead the way to the achievement of higher J(O 2 )v alues, meeting technical feasibility requirements for their implementation as O 2 suppliers in industrial plants. XRD, backscattered electrons detector (BSD)-SEM, and energy-dispersive X-ray spectroscopy (EDS) analysis on the spent membrane further confirmed material stabilityw hen exposed to oxyfuel environments.…”

Section: Discussionmentioning

confidence: 99%

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

2015

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Dual-phase membranes are appealing candidates for oxygen transport membranes owing to their unique combination of ambipolar electron-ion transport and endurance. However, O2 separation in industrial environments demands very high stability and effectiveness in the presence of CO2- and SO2-bearing process gases. Here, the composition of dual-phase membranes based on NiFe2O4-Ce(0.8) Tb(0.2)O(2-δ) (NFO-CTO) was optimized and the effective performance of catalytically-activated membranes was assessed in presence of CO2 and SO2. Further insight into the limiting mechanisms in the permeation was gained through electrical conductivity studies, permeation testing in several conditions and impedance spectroscopy analysis. The dual-phase membranes were prepared by one-pot sol-gel method and their permeability increases with increasing fluorite content. An O2 flux of 0.25 (ml min(-1) cm(-2)) mm at 1000 °C was obtained for a thick self-standing membrane with 40:60 NFO/CTO composition. An in-depth study mimicking typical harsh conditions encountered in oxyfuel flue gases was performed on a 50:50 NFO/CTO membrane. CO2 content as well as SO2 presence in the sweep gas stream were evaluated in terms of O2 permeation. O2 fluxes of 0.13 and 0.09 mL min(-1) cm(-2) at 850 °C were obtained for a 0.59 mm thick membrane under CO2 and 250 ppm SO2 in CO2 sweep conditions, respectively. Extended periods at work under CO2- and SO2-containing atmospheres revealed good permeation stability over time. Additionally, XRD, backscattered electrons detector (BSD)-SEM, and energy-dispersive X-ray spectroscopy (EDS) analysis of the spent membrane confirmed material stability upon prolonged exposure to SO2.

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“…This means that the modelling results can be factored into the choice of exisiting production technologies and can help to substantiate the need for new production technologies. For example, freeze casting , and phase‐inversion tape casting are currently being investigated and used for the production of particularly straight channel structures and defined pore opening diameters. These two methods are suitable for producing both planar and tubular modules, including capillaries.…”

Section: Dense Membranesmentioning

confidence: 99%

Ceramic Membranes: Materials – Components – Potential Applications

et al. 2019

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Gas separation in dense ceramic membranes is driven by the partial pressure gradient across the membrane. The mixed conducting materials most commonly used are single‐phase perovskites or fluorites. In recent years, the development of dual‐phase systems combining a mixed ion‐conducting and electron‐conducting phase has increased. The advantage is that a larger number of very stable materials systems is available. The membrane designs currently used include planar, tubular, hollow‐fiber, and honeycomb membranes. Each of these designs has specific advantages and disadvantages, depending on the application. Innovative joining concepts are also often needed due to the high temperatures involved. These usually involve the use of glass‐ceramic sealants or reactive metal brazes. Applications focus either on the separation of gases alone, i.e., the supply of oxygen or hydrogen, or on membrane reactors. In membrane reactors, a chemical reaction occurs on one or both sides of the membrane in addition to gas separation. The supply of gases is of potential interest for power plants, for the cement, steel, and glass industries, for the medical sector, and for mobile applications. Membrane reactors can be used to produce base chemicals or synthetic fuels.

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Enhanced Oxygen Separation through Robust Freeze‐Cast Bilayered Dual‐Phase Membranes

Cited by 54 publications

References 42 publications

Creep behavior of porous La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membrane supports

Creep behavior of porous La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membrane supports

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

Ceramic Membranes: Materials – Components – Potential Applications

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