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- W2359471569 abstract "Hydrogen abstraction from toluene by OH, H, O, CH3, and HO2 radicals are important reactions in oxidation process of toluene. Geometries and corresponding harmonic frequencies of the reactants, transition states as well as products involved in these reactions are determined at the B3LYP/6-31G(2df,p) level. To achieve highly accurate thermochemical data for these stationary points on the potential energy surfaces, the Gaussian-4(G4) composite method was employed. Torsional motions are treated either as free rotors or hindered rotors in calculating partion functions to determine thermodynamic properties. The obtained standard enthalpies of formation for reactants and some prodcuts are shown to be in excellent agreement with experimental data with the largest error of 0.5 kcal mol–1. The conventional transition state theory (TST) with tunneling effects was adopted to determine rate constants of these hydrogen abstraction reactions based on results from quantum chemistry calculations. To faciliate its application in kinetic modeling, the obtained rate constants are given in Arrhenius expression: k(T) = ATn exp(−EaR/T). The obtained reaction rate constants also agree reasonably well with available expermiental data and previous theoretical values. Branching ratios of these reactions have been determined. The present reaction rates for these reactions have been used in a toluene combustion mechanism, and their effects on some combustion properties are demonstrated." @default.
- W2359471569 created "2016-06-24" @default.
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- W2359471569 date "2016-05-17" @default.
- W2359471569 modified "2023-09-22" @default.
- W2359471569 title "Theoretical Prediction of Rate Constants for Hydrogen Abstraction by OH, H, O, CH<sub>3</sub>, and HO<sub>2</sub> Radicals from Toluene" @default.
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- W2359471569 doi "https://doi.org/10.1021/acs.jpca.6b03049" @default.
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