Development of Catalyst System with Solid Electrolyte

Abstract

We have studied the NOx reduction system in the presence of excess oxygen. This catalyst system has a laminated structure of NOx removal catalyst and solid electrolyte layers, and can decompose NOx and eliminate O₂ in gas mixture, simultaneously.In this study, gadolinium-doped ceria (CGO) was selected as a solid electrolyte due to its higher O^2- conductivity rather than YSZ at lower temperature. However, CGO does not have enough fracture strength, so we attempted the improvement of mechanical properties of CGO by dispersing Al₂O₃ particles with high strength. And, we evaluated the electrical and catalytic properties of Al₂O₃-CGO based catalyst system.