Decreasing interfacial losses with catalysts in La0.9Ca0.1FeO3–δ membranes for syngas production

• La0.9Ca0.1FeO3 membranes were modified by porous layer with infiltrated catalysts.
• Addition of catalysts to membrane surfaces increased oxygen permeation flux.
• Contribution of bulk and surface resistance to the total resistance was determined.
• Rs was found to dominate Rtot, demonstrating importance of interfacial losses.

The effect of modification of the surface of a La0.9Ca0.1FeO3 (LCF) membrane by the addition of a porous layer with an infiltrated catalyst on oxygen flux through the membrane in a CO/air gradient was investigated. Membranes with Pt and CeO2 catalysts on the fuel (CO) side and La0.8Sr0.2FeO3 (LSF) on the air-side exhibited oxygen permeation fluxes that were 91, 28, and 5.8 times greater at 873 K, 973 K, and 1073 K, respectively, compared to a membrane with unmodified surfaces. The relative contributions of the bulk (Rb) and surface (Rs) resistances to the total resistance to oxygen ion flow (Rtot) were accessed by measuring the oxygen flux as a function of the membrane thickness. Rs was found to dominate Rtot, demonstrating the importance of the surface processes.

Figure optionsDownload high-quality image (112 K)Download as PowerPoint slide