Influence of glass and gold sealants materials on oxygen permeation performances in La 0.8Sr 0.2Fe 0.7Ga 0.3O 3− δ perovskite membranes

Abstract

Gas dissociation with a ceramic membrane is an economical and environmental attractive process for methane gas conversion into syngas (mixture of H 2 and CO). For this application, the membrane materials require mixed ionic and electronic conductivities in a large range of pO 2 resulting in an excellent oxygen semi-permeation of the membrane to improve methane conversion. In this paper, particular attention is given to the influence of sealant materials on oxygen semi-permeation performances of membrane materials. For instance, oxygen semi-permeation measurements have been performed with La 0.8Sr 0.2Fe 0.7Ga 0.3O 3− δ membranes under an oxygen partial pressure gradient at temperatures from 700 °C to 1000 °C with different sealing materials (glass or gold ring sealant) between the membrane and the support. The result leads to a better understanding of the effects of sealing on oxygen transport through the La 0.8Sr 0.2Fe 0.7Ga 0.3O 3− δ membrane. Indeed, a gold sealing material is required for accurate measurements of oxygen semi-permeation flux.