Perovskite membranes stability

In addition to the challenges mentioned above, the thermochemical stability of the perovskite membranes in syngas environment is a major hurdle that needs to be overcome for successful implementation of membrane technology for hydrogen separation. Both SrCeOs and BaCe03 based compositions are shown to be unstable in the presence of CO2 and H2O [16-18]. It was shown that replacing a fraction of Ce in the perovskite with Zr also provided improved stability [19]. However this... 

Two different sections are required because metallic Pd-based membranes for selective H2 extraction can only be operated below typically 700 °C because of membrane stability, while acceptable O2 fluxes through available perovskite-type O2 permselective membranes can only be realized above 900-1000 °C. In this case, the air separation is achieved in situ resulting in lower costs and intrinsic CO2 capture. 

Chemical Stability of Perovskite Membranes Under Flue-Gas Conditions... 

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. 

In spite of the significant efforts dedicated to the improvement of mechanical properties, nowadays on the threshold of massive industrial application of the perovskite membranes, the increase of the chemical stability is the most... 

Stability of Lao.6Sro.4Coo.2Feo.803 6 perovskite membranes in reducing and nonreducing environments, /nd. Eng. 

In Chapter 10, the use of membranes for different applications are described. One of the possible membranes for hydrogen cleaning is an asymmetric membrane comprised of the dense end of a proton conduction perovskite such as BaCe0 95 Yb0 05O3 5 and a porous end to bring mechanical stability to the membrane. In this case, it is possible to take from the slurry, obtained by the acetate procedure, several drops to be released over a porous ceramic membrane, located in the spinning bar of a spin-coating machine. Thereafter, the assembly powder, thin film porous membrane is heated from room temperature up to 1573 K at a rate of 2K/min, kept at this temperature for 12 h, and then cooled at the same rate in order to get the perovskite end film over the porous membrane [50],... 

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