Permeability perovskite oxide

High performance oxygen permeable membranes with Nb-doped BaBio.osCoo.9503 8 perovskite oxides. 

Dong, X., Jin, W., and Xu, N. (2010) Reduction-tolerant oxygen-permeable perovskite-type oxide SrovBao.sFeov M00.1O3-S. Chem. Mater., 22, 3610-3618. 

It is well known that dense ceramic membranes made of the mixture of ionic and electron conductors are permeable to oxygen at elevated temperatures. For example, perovskite-type oxides (e.g., La-Sr-Fe-Co, Sr-Fe-Co, and Ba-Sr-Co-Fe-based mixed oxide systems) are good oxygen-permeable ceramics. Figure 2.11 depicts a conceptual design of an oxygen membrane reactor equipped with an OPM. A detail of the ceramic membrane wall... 

In the early 1990s, Balachandran et al. (51,64,65) of the Argonne National Laboratory, in collaboration with Amoco (now part of BP), investigated the partial oxidation of methane using membrane materials consisting of Sr-Fe-Co-O mixed oxides with the perovskite structure, which have high oxygen permeabilities. In their experiments (51,66), the membrane tubes, which were... 

H. Kruidhof, H.J.M. Bouwmeester, R.H.E. van Doom and A.J. Burggraaf, Influence of order-disorder transitions on oxygen permeability through selected nonstoichiometric perovskite-type oxides. Solid State Ionics, 63-65 (1993) 816-822. 

The consideration of thermal effects and non-isothermal conditions is particularly important for reactions for which mass transport through the membrane is activated and, therefore, depends strongly on temperature. This is, typically, the case for dense membranes like, for example, solid oxide membranes, where the molecular transport is due to ionic diffusion. A theoretical study of the partial oxidation of CH4 to synthesis gas in a membrane reactor utilizing a dense solid oxide membrane has been reported by Tsai et al. [5.22, 5.36]. These authors considered the catalytic membrane to consist of three layers a macroporous support layer and a dense perovskite film (Lai.xSrxCoi.yFeyOs.s) permeable only to oxygen on the top of which a porous catalytic layer is placed. To model such a reactor Tsai et al. [5.22, 5.36] developed a two-dimensional model considering the appropriate mass balance equations for the three membrane layers and the two reactor compartments. For the tubeside and shellside the equations were similar to equations (5.1) and... 

To date, a variety of oxygen permeable membranes have been reported. In 1985, Teraoka et al. reported that La-Sr-Co-Fe-based perovskite-type oxides (LSCF), especially with high Sr and Co content, have a high oxygen permeation rate (Teraoka,... 

Takamura, H., Enomoto, K., Aizutni, Y., Kamegawa, A., Okada., M. (2004). Preparation and oxygen permeability of Pr-Al-based perovskite-t)fpe oxides. Solid State Ionics, 175, 379. 

Wang, H.H., Tablet, C Feldhoff, A., and Caro, J. (2005) A cobalt-free oxygen-permeable membrane based on the perovskite-type oxide Bao.sSro.sZno.2Feo.803 s. Adv. Mater., 17, 1785-1788. 

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