Oxygen permeation, dense ceramic

Shao, Z., Xiong, G., Dong, H., et al. (2001). Synthesis, Oxygen Permeation Study andMembrane Performance of a Bag 5 Sro,5 Coq.s Feo.2 O3—5 Oxygen-Permeable Dense Ceramic Reactor for Partial Oxidation of Methane to Syngas, Sep. Purif. Technol., 25, pp. 97-116. 

FIGURE 10.3 (a) Hydrogen and (b) oxygen permeation through dense oxide ceramic membranes. 

Extensively studied is oxygen permeation through dense ceramic membranes (e.g. perovskhes). Temperatures > 600 °C are applied. Here, oxygen splits at the surface and is transited as 0 . Porous membranes include porous polymer films (cellulosics, polyamides) as well as amorphous inorganic materials (alumina, silica). 

R.H.E. Van Doom, H. Kruidhof, H.J.M. Bouwmeester and A.J. Burggraaf, Oxygen permeation through dense ceramic membranes of Sr-doped LaCoOs-s membranes. To be submitted. 

It has been reported [22] that micro/nano surface reactive layers introduced on the surface of oxygen ion transport membranes enhanced the oxygen permeability of dense oxygen-permeable perovskite-type ceramic membranes, Lao.7Sro.3Gao.6Feo.403 6. The results also showed that the oxygen permeation flux is influenced by the surface area of the surface-reactive layer. 

Air separation membranes are typically dense ceramic (typically perovskite) membranes, which selectively permeate oxygen in ionic form. Over the past two decades. Air Products (ITMs) and Praxair (oxygen transport membranes [OTMs]) have worked towards the commercial scale-up of these membranes for applications in power generation, gasification, and gas to liquid conversion [94]. Air Products has focused on a planar configuration, whereas Praxair on tubular membranes. 

Oxygen permeation measurements and sealing dense MIEC ceramic membranes... 

Ma, B., Balachandran, U., Chao, C. C., Park, J. H., Segre, C. U. (1997). Oxygen permeation in Sr—Fe—Co—O dense cetamic membranes. British Ceramic Transactions, 73, 169—177. Mahesh, S., Akira, K. (2010). Carbon dioxide decomposition by plasma methods and apphcation of high energy and high density plasmas in material processing and nano-stmctures. Transactions of JWRI39, 11—25. 

Concerning non-porous membranes, these are categorized as dense ceramic electrolytes such as yttria-stabilized zirconia (YSZ) and perovskite membranes [16], which allow only the permeation of ionic oxygen. Permeation through metal membranes such as palladium and a palladium alloy is based on the selective dissolution of hydrogen and diffusion through the metal membrane. 

Figure 5.1 shows schematically the oxygen permeation through dense ceramic membranes. For the electrolyte membrane, an external circuit is... 

Figure 5.1 Oxygen permeation in dense ceramic membranes (a) electrochemical oxygen pump (b) oxygen permeation together with production of electricity ...

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