Influence of glass and gold sealants materials on oxygen permeation performances in La₀.₈Sr₀.₂Fe₀.₇Ga₀.₃O₃₋δ perovskite membranes

• Published in: Journal of membrane science 2011, Vol.366 (1-2), p.132-138
• Main Authors: Vivet, A, Geffroy, P.M, Coudert, V, Fouletier, J, Richet, N, Chartier, T
• Format: Article
• Language: English
• Subjects: artificial membranes; carbon dioxide; ceramics; Chemistry; Colloidal state and disperse state; dissociation; electrical conductivity; Exact sciences and technology; gallium; gases; General and physical chemistry; glass; gold; hydrogen; iron; lanthanum; Membranes; methane; oxygen; strontium; temperature
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2010.09.048

Gas dissociation with a ceramic membrane is an economical and environmental attractive process for methane gas conversion into syngas (mixture of H₂ and CO). For this application, the membrane materials require mixed ionic and electronic conductivities in a large range of pO₂ 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 La₀.₈Sr₀.₂Fe₀.₇Ga₀.₃O₃₋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 La₀.₈Sr₀.₂Fe₀.₇Ga₀.₃O₃₋δ membrane. Indeed, a gold sealing material is required for accurate measurements of oxygen semi-permeation flux.