Free-radical reactions in glow and explosion of carbon monoxideoxygen mixtures
| Autor: | Bernard Lewis, G. Von Elbe |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
chemistry.chemical_classification
Langmuir Hydrogen General Chemical Engineering Radical General Physics and Astronomy Energy Engineering and Power Technology chemistry.chemical_element General Chemistry Chemical kinetics chemistry.chemical_compound Fuel Technology Adsorption chemistry Physical chemistry Compounds of carbon Qualitative inorganic analysis Carbon monoxide |
| Zdroj: | Combustion and Flame. 63:135-150 |
| ISSN: | 0010-2180 |
| DOI: | 10.1016/0010-2180(86)90116-1 |
| Popis: | Examination of published compilations of rate coefficients of free-radical reactions yields the following reactions that are associated with chain branching in mixtures of CO and O2 and small quantities of hydrogen or water vapor: I ′ OH + CO → CO 2 + H , II H + O 2 → OH + O , III O + H 2 → OH + H , III ′ O + H 2 O →2 OH , XI ′ HO 2 + CO → CO 2 + OH , VI H + O 2 +M→ HO 2 +M, XX O + CO +M→ CO 2 ∗+M, XXI O + O 2 +M→ O 3 +M, The complete mechanism includes diffusion of HO2 radicals to the vessel wall and their adsorption and reaction at the surface. This mechanism is applied to the data of Buckler and Norrish on the branched-chain explosion of COO2 mixtures containing H2 in the order of 1 mm Hg. Substantial agreement is found between theory and experiment. Further, the mechanism is applied to experiments of Bond, Gray, and Griffiths with an H2 content of 0.01–0.05 mm Hg. By specifying details of the adsorption and surface reaction of HO2 on the basis of Langmuir's adsorption isotherm the phenomenon of glow is explained and the regions of slow reaction, glow, and explosion are described in accord with the experimental data. It is confirmed that the reaction between CO and O2 requires the presence of a hydrogenous compound such as H2, H2O, CH4, etc., and that “dry” homogenous reaction is not possible except at very high temperatures. |
| Databáze: | OpenAIRE |
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