This title appears in the Scientific Report :
2022
Ceramic Membranes for Hydrogen Separation from Gas Mixtures
Ceramic Membranes for Hydrogen Separation from Gas Mixtures
Hydrogen separation from gas mixtures can be realized by dense ceramic membranes or porous membranes. Dense ceramic gas separation membranes usually pass ions through their lattice in a temperature range of 400-900°C. The charge balance also takes place through electron conduction in the membrane. T...
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Personal Name(s): | Meulenberg, Wilhelm Albert (Corresponding author) |
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Baumann, Stefan / Deibert, Wendelin / Wolter, Julia Lucia / Van Gestel, Tim / Guillon, Olivier | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 JARA-ENERGY; JARA-ENERGY |
Imprint: |
2021
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Conference: | Aachen Hydrogen Colloquium, Aachen (Germany), 2022-05-03 - 2022-05-04 |
Document Type: |
Conference Presentation |
Research Program: |
Power-based Fuels and Chemicals |
Publikationsportal JuSER |
Hydrogen separation from gas mixtures can be realized by dense ceramic membranes or porous membranes. Dense ceramic gas separation membranes usually pass ions through their lattice in a temperature range of 400-900°C. The charge balance also takes place through electron conduction in the membrane. The driving force is the gradient of the partial pressure across the membrane. Single-phase perovskites or fluorites are usually used as mixed conducting materials. Recently, however, dual-phase systems in which an ionically conducting phase is mixed with an electronically conducting phase have been increasingly used. The advantage of this combination is that a large number of very stable material systems is available. In order to ensure a high transport of oxygen or hydrogen, the membranes should be designed as a thin layer on a porous carrier. To reach a high performance of this membrane systems, thin film membranes, active surface layers and thermochemical and -mechanical stable supports with designed porosity are required. Porous membranes separate gases by molecular sieving and adsorption effects. The pore sizes of the so-called microporous membranes are in the range of the kinetic diameters of the gases to be separated, i.e. in the range of approx. 0.2-0.4 nm. The carrier of thin film membranes must ensure sufficient mechanical stability and good gas transport. In addition to thermochemical stability under application conditions, no reaction between membrane and substrate material should occur during sintering or operation.Planar, tubular, hollow fibre or honeycomb concepts are used for the membrane design. Depending on the application, the respective designs have specific advantages or disadvantages. Due to the high temperatures, innovative joining concepts are often required. Mostly glass ceramic solders or metallic reactive solders are used.In the application, a distinction can be made between pure gas separation, i.e. the provision of e.g. oxygen or hydrogen, and membrane reactors. In membrane reactors, in addition to gas separation, a chemical reaction takes place on one or both sides of the membrane. The supply of gases can be of interest for power plants, cement, steel or glass plants as well as mobile applications. Membrane reactors can be used to produce basic chemicals or synthetic fuels. |