Impact of particle size and morphology of cobalt oxide on the thermal response to methane examined by thermal analysis

Abstract. Differential thermal analysis (DTA) was used to examine the effect of particle size and morphology cobalt (III/IV) oxide (Co3O4) on its response under exposure methane (1 vol % in dry synthetic air), which is a relevant gas for detection combustible gases. The DTA results from catalytic oxidation methane, characteristics should correlate with pellistor response. Co3O4 samples differing were produced by ball milling (top-down technique) or synthesized precursor molecules precipitation (bottom-up technique). investigations carried out air temperature range between 250 450 ?C reveal that both shape have considerable response, since resulting layer structures associated surface area available interaction differ. catalyst, small particles an irregular shape, exhibits significantly higher than milled samples. Comparison mass spectroscopy signal CO2 evolved reaction verified certain analogy measurements pellistor.