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| Home > Publications database > Fabrication and Joining of Proton Conducting Cell Assemblies for Dehydrogenation of Alkanes |
| Home > Publications database > Fabrication and Joining of Proton Conducting Cell Assemblies for Dehydrogenation of Alkanes |
| Conference Presentation (After Call) | FZJ-2024-05273 |
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2024
Abstract: Satisfyingthe ever increasing global demand for energy and material goods whileachieving the ambitious CO 2 emissions targets of the EU for 2030 on climate changerequires the utilization of renewable resources e.g., wind, solar) in the fuels andchemical industries. The project AMAZING (Additive Manufacturing for Zero emissionInnovative Green Chemistry) directly addresses this by replacing large scale hightemperature cracking processes e.g., steam cracking) with el ectrically driven thermocatalytic activation of alkanes to produce chemical building blocks allowing significantreduction in the CO 2 emissions associated with energy intensive cracking reactions.Thecore of the cell assembly is a ceramic membrane made from mixed proton andelectron conducting La 6 x WO 12 δ To increase the electronic conductivity of the materialMo as doping element is used to form La 6 x W 0.8 Mo 0.2 O 12 δ (LWO Mo20). The powder isin house produced and the particle size, specific surface area and chemical compositionis determined before the ceramic layers are formed. Therefore, three differentfabrication techniques are used in this work. The first one is sequential tape casting andlamination to fabricate an asymmetric structure of a dense m embrane layer (thickness25 µm) and a porous support (thickness 500 µm). Furthermore 3D printingtechniques are implemented to achieve defined support structures. Firstly, acombination of tape casting and material extrusion ( is introduced, where thesupport structure is printed directly on a tape cast membrane layer. This techniqueallows a good membrane quality but suffers during the co firing of the final layers.Secondly, a pure 3D printing approach is introduced, which utilizes 3D screen print ing.With this technique both, membrane and support layer, are formed subsequently in onemachine allowing good membrane quality and precise support structures.Afterco firing all membrane components undergo a quality testing procedure, whichincludes He leakage determination and white light topography. The next step is thejoining of the ceramic membrane into a metal frame to form a membrane module, whichcan easily be built in a test reactor and quickly exchanged for multiple tests. The joiningprocedure takes place in a furnace at 850 °C applying load on the sealing area. Glasssealant is used to connect the ceramic and metal part. After joining, another He leakagetest is performed to assure the joining quality. With this procedure large amounts oflab scale membrane modules can be fabricated for further performance tests.
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