Kinetics of the reactions of the OH radical with 2-methyl-1-propanol, 3-methyl-1-butanol and 3-methyl-2-butanol between 241 and 373 K

Abstract

Absolute rate constants have been measured for the gas-phase reactions of hydroxyl radicals with 2-methyl-1-propanol (k₁), 3-methyl-1-butanol (k₂) and 3-methyl-2-butanol (k₃). Experiments were carried out using two different techniques, the relative rate method and the pulsed laser photolysis-laser induced fluorescence technique. The kinetic data were used to derive the following Arrhenius expressions in the temperature range 241–373 K(in units of cm³ molecule⁻¹ s⁻¹):k₁ = (3.1±0.9) × 10⁻¹²exp[(352±82)/T]k₂ = (2.8±0.9) × 10⁻¹²exp[(503±98)/T]k₃ = (2.6±0.6) × 10⁻¹²exp[(456±65)/T]At 298 K, the reaction rate constants obtained by the two methods were in very good agreement. The results are presented, discussed and used to estimate the atmospheric lifetimes for the studied alcohols.