Journal Article

FZJ-2022-03633

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Up-scaling and processing related characterisation of hydrogen permeation membranes based on pristine and Mo substituted La28−xW4+xO54+1.5x

Deibert, W. (Corresponding author)FZJ* ; Ivanova, M. E. (Corresponding author)FZJ* ; Ran, K.FZJ* ; Mayer, J.FZJ* ; Meulenberg, W. A.FZJ*

2023
Elsevier Science Amsterdam [u.a.]

This record in other databases:  

Please use a persistent id in citations: http://hdl.handle.net/2128/32069  doi:10.1016/j.jeurceramsoc.2022.09.033

Abstract: Mixed protonic and electronic conducting ceramic membranes offer a high potential to separate pure hydrogen from gas mixtures or in the field of membrane reactors. The water-gas-shift reaction is an example for the possible application of lanthanum tungstate based materials with general formula La28−xW4+xO54+1.5x (LaWO) due to their high stability under the reaction conditions. To bring ceramic membranes one step closer to commercialisation, high effort is needed to find optimised material compositions and transfer them into suitable fabrication techniques. Both is done in the present work. First, a detailed XRD-study, supported by microstructural analysis, was performed to find a suitable composition for Mo-substituted LaWO. As it was demonstrated, with increasing the Mo concentration as a substitute for W leading to enhanced electronic conductivity, the single phase region narrows and La/W ratio shifts to the higher values. In order to ensure single phase composition of the powder used in the membrane fabrication, 20 mol.% Mo substituted LWO was the material of choice. Subsequently tape-casting was performed to produce asymmetric membranes consisting of a thin functional membrane made of LaWO-Mo20 and a porous support layer of pure LaWO. Such asymmetric component could be scaled-up to 100 cm² active membrane area. The sintering behaviour was characterised by optical dilatometry. The more cost-efficient support material MgO was shown to be incompatible with the LaWO-Mo20 material. Therefore, an advanced fabrication route was developed by introducing an intermediate layer to overcome interdiffusion and secondary phase formation.

---

Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2022

---

Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---