Oxygen transport through dense BaBi 0.05Sc 0.1Co 0.85O 3− δ ceramic membrane

Abstract

Novel dense perovskite BaBi 0.05Sc 0.1Co 0.85O 3− δ (BBSC) membranes showed promising flux performance to separate oxygen from air. The oxygen transport through BBSC in discs and hollow fibres geometry were modelled as a function of oxygen partial pressure in the permeate side and temperature using simple correlations. The oxygen diffusion ( D O) and surface exchange ( k S ) coefficients and also the characteristic thickness ( L C ) were extracted from the series of flux data based on disc membranes. Employing the obtained oxygen diffusion coefficient, the surface exchange coefficients ( k f and k r ) for the hollow fibre geometry can then be obtained from another tubular correlation by fitting with flux data based on hollow fibre membranes. The physical importance of the parameters (i.e. D O, k S , L C , k f and k r ) was discussed. The effects of controllable variables, i.e. temperature and oxygen partial pressure, in the permeate side onto oxygen flux performance were also elaborated.