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% H 2 + 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% H 2 + 70–40% CH 4 ) stoich + air mixtures at temperatures below 350...

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Bibliographic Details
Published in:Russian journal of physical chemistry. B 2019-03, Vol.13 (2), p.305-312
Main Authors: Rubtsov, N. M., Vinogradov, A. N., Kalinin, A. P., Rodionov, A. I., Rodionov, I. D., Troshin, K. Ya, Tsvetkov, G. I., Chernysh, V. I.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Combustion
Explosion
Foils
Ignition temperature
Metal surfaces
Methane
Palladium
Physical Chemistry
Platinum
Shock Waves
Water chemistry
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Summary:The ignition temperature of the 40% H 2 + 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% H 2 + 70–40% CH 4 ) 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 H 2 O* 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.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793119020210