Study of Combustion of Hydrogen—Air and Hydrogen—Methane—Air Mixtures over the Palladium Metal Surface Using a Hyperspectral Sensor and High-Speed Color Filming.

The ignition temperature of the 40% H₂ + air mixture in the presence of metallic palladium (70°C, 1 atm) was found to be ~200°C lower than above the platinum surface (260°C, 1 atm). In addition, Pd initiated the ignition of (30–60% H₂ + 70–40% CH₄)_stoich + air mixtures at temperatures below 350°C, while Pt foil did not initiate the burning of these mixtures up to 450°C. The effective activation energy of ignition over Pd was evaluated to be ~3.5 kcal/mol. It was found using a hyperspectral sensor that the system of emission bands of H₂O* was absent in the range 570–650 nm in the presence of leucosapphire; a possible explanation of this phenomenon was given. An explanation was proposed for the appearance of an additional source of excited water molecules emitting in the range 900–970 nm. [ABSTRACT FROM AUTHOR]