Towards Low Temperature Operation of Catalytic Gas Sensors: Mesoporous Co3O4-Supported Au–Pd Nanoparticles as Functional Material

It is shown that the operating temperature of pellistors for detection methane can be reduced to 300 °C by using Au–Pd nanoparticles on mesoporous cobalt oxide (Au–Pd@meso-Co3O4). The aim reduce possible catalyst poisoning occurs during high-temperature operation conventional Pd-based pellistors, which are usually operated at 450 or higher. individual role as well Co3O4 in terms their catalytic activity has been investigated. Above °C, bimetallic particles mainly responsible combustion methane. However, below only a effect. In contrast methane, sensor response and increase under propane exposure much larger than due heat propane. Due its lower activation energy requirement, exhibits higher propensity oxidation compared As result, achieved even temperatures enhanced reactivity.