Abstract
THE hydroperoxyl radical has been postulated as an intermediate in numerous oxidation reaction mechanisms. In particular, mechanisms involving it are capable of giving detailed explanations of the explosion limits and reaction-rates in hydrogen–oxygen systems in static reaction vessels1,2. In discussing hydrogen-oxygen and hydrogen–air flames, however, reactions of HO2 are usually omitted, on the assumption that most of the flame reaction occurs at too high a temperature for the HO2 forming reaction (2) to compete with the chain-branching reaction (1). We have recently obtained evidence, arising from a detailed investigation of a slow-burning hydrogen–oxygen–nitrogen flame and from calculations involving two faster (higher temperature) flames, that this assumption may be invalid in many cases.
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