Elaboration of La1−xSrxFe1−yGayO3−δ multilayer membranes by tape casting and co-firing for syngas application

The decrease of the dense layer thickness can lead to increase the internal stresses in the membrane due to the chemical expansion of membrane material under a large gradient of oxygen partial pressure. This chemical expansion due to pO2pO2 gradient through the membrane leads to important mechanical stresses in the membrane and commonly to the membrane rupture under large range of pO2pO2, i.e. air/methane atmosphere. The solution suggested in this paper is the elaboration by tape casting and co-firing process of multilayer membranes with a specific design in order to decrease stresses due to the chemical expansion in working conditions.