Perovskite membranes oxygen permeation

Li, H., Zhu, X., Liu, Y., Wang, W., and Yang, W. (2014) Comparative investigation of dual-phase membranes containing cobalt and iron-based mixed conducting perovskite for oxygen permeation. /. Membr. ScL, 462,... 

Xu, S.J. and Thomson, W.J. (1999) Oxygen permeation rates through ion-conducting perovskite membranes. Chemical Engineering Science, 54, 3839-3850. 

Figure 9.12 Temperature dependence of the oxygen permeation fluxes through various mixed-conducting membranes, made of perovskite-related compounds with predominant electronic conductivity, under fixed oxygen chemical potential gradients...

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. 

High-temperature applications of perovskite-type membrane reactors require improved material performances and operational stability. The reactor microstruc-ture and architecture controls were found to be crucial for thermo-mechanical integrity and oxygen permeation kinetics. A multilayer reactor was developed, using second-phase particles to control its microstructure and a co-sintering process to control its architecture. 

Fig. 6.8 SEM micrograph of a multilayer perovskite reactor (left) and its oxygen permeation flux with temperature compared with a thick dense membrane right)...

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. 

Fig. 7.7 Temperature dependence of the rate of oxygen permeation through perovskite membranes.

Whereas most perovskite material have operation temperatures above 800 °C, our BCFZ perovskite hollow fiber membrane could be successfully used for oxygen separation from air between 400 and 500 °C (Figure 16.6). As Figure 16.6 shows, the oxygen permeation flux increases from 0.03 to 0.45 mL cm min as the temperature rises from 400 to 500 °C. However, in... 

In most MIEC perovskite membranes for oxygen permeation, the electronic conductivity usually overwhelms the ionic conductivity, i.e. CyDy and... 

As described above, the resistances to oxygen permeation in perovskite membranes may be from the bulk diffusion and the surface exchange reactions. 

Table 4.1 Comparison of oxygen permeation performance of BSCF5582 membranes in different geometries with other most studied A Sr, ByCo 0 i based perovskite membranes. All flux values and sweep gas flow rates are quoted at standard temperature and pressure (STP) s C) ... 

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