Addition of C3H8, n- and i-C4H10 to slowly reacting mixtures of hydrogen and oxygen at 480°C

Abstract

The relative rates of consumption of hydrocarbon and H₂ have been determined when small amounts of C₃H₈, n- and i-C₄H₁₀ have been added to slowly reacting mixtures of H₂+ O₂ in aged boric-acid-coated vessels at 480°C. Interpretation of the results enables the velocity constants for attack of H and OH on RH to be determined at 480°C, and these values have been combined with measurements at lower temperatures to give overall Arrhenius' parameters. For C₂H₆ and these three hydrocarbons, the velocity constants appear to be additive, and Arrhenius parameters per C—H bond for attack at primary, secondary and tertiary positions have been obtained. Upper limits for the velocity constants for HO₂ attack have also been estimated.