Abstract
For the first time, vibrationally excited HF molecules (v = 2, 3) are observed with the use of hyperspectrometers in the VIS and NIR ranges in the products of the reactions of oxidation of hydrogen and methane in the presence of Difluorodichloromethane (CF2Cl2). The combustion of hydrogen and methane in air and oxygen at atmospheric and reduced pressure is initiated by a spark discharge. The propagation of the flame front is recorded using high-speed color filming. It is found that during the combustion of methane HF (v = 3) molecules are formed at the moment of reaching the maximum rate of the chemical transformation, i.e., reactions involving CF2Cl2 molecules compete directly with the development of reactive chains. It is also found that the concentration limit of the ignition of a premixed hydrogen-air mixture in the presence of Difluorodichloromethane at a pressure of 1 atm exceeds 10% CF2Cl2, while the concentration limit of the ignition of a premixed methane-air mixture is 1% CF2Cl2. This means that the active centers of the combustion of hydrogen and methane, which determine the development of combustion, have a different chemical nature. It is shown that the set of reactions involving Difluorodichloromethane molecules, leading to the formation of HF (v = 2, 3) during methane combustion, should include active centers of methane combustion.
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Funding
The experiments conducted to study the inhibition of the combustion of hydrogen and methane in oxygen and air by dichlorodifluoromethane additives were carried out as part of a state assignment of the Federal Research Center for Chemical Physics, Russian Academy of Sciences (registration number AAAA-A21-121011990037-8); experiments using high-speed color filming were carried out as part of the a state assignment of the Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, topic 44.1; the experiments on studying combustion based on a hyperspectrometer were carried out as part of a state assignment of the Institute for Problems in Mechanics, Russian Academy of Sciences (registration number AAAA-A20-120011690135-5); and the experimental results were processed as part of state assignments with registration numbers AAAA-A17-117021310376-4, AAAA-A17-117112240026-5, and AAAA-A21-121011990037-8.
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Rodionov, A.I., Rubtsov, N.M., Vinogradov, A.N. et al. Formation of Vibrationally Excited HF Molecules during the Inhibition of Hydrogen and Methane Combustion in Oxygen and Air by Dichlorodifluoromethane. Russ. J. Phys. Chem. B 15, 702–709 (2021). https://doi.org/10.1134/S1990793121040229
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DOI: https://doi.org/10.1134/S1990793121040229