Accelerated Deactivation of Mesoporous Co3O4-Supported Au–Pd Catalyst through Gas Sensor Operation

High activity of a catalyst and its thermal stability over lifetime are essential for catalytic applications, including gas sensors. Highly porous materials attractive to support metal catalysts because they can carry large quantity well-dispersed nanoparticles, which well-accessible reactants. The present work investigates the long-term mesoporous Co3O4-supported Au–Pd (Au–Pd@meso-Co3O4), with loading 7.5 wt% catalytically active Co3O4 (meso-Co3O4) use in Both were characterized concerning their sensor response towards different concentrations methane propane (0.05–1%) at operating temperatures ranging from 200 °C 400 duration h. initially high Au–Pd@meso-Co3O4 decreased significantly after operation, while meso-Co3O4 without metallic was less affected. Electron microscopy studies revealed that hollow structure is lost presence particles. Additionally, Ostwald ripening nanoparticles observed. morphology pure altered. low thermodynamical phase transformation temperature Co3O4, as well loading, parameters influencing accelerated sintering deactivation catalyst. Despite activity, not stable increased thus well-suited