Computational Study of the Mechanism and Product Yields in the Reaction Systems C2H3+CH3C3H6H+C3H5 and C2H3+CH3>CH4+C2H2

Published

April 1, 2002

Author(s)

S I. Stoliarov, Vadim D. Knyazev, I R. Slagle

Abstract

The mechanism of the radical-radical reaction C₂H₃ + CH₃ (1) was studied by quantum chemical methods. The pathways of reaction channels observed in previous experimental studies, as well as those of other potential channels, were investigated. The results of the quantum chemical study and of the earlier experimental work were used to create a model ofthe chemically activated route (C₂H₃ + CH₃ --> C₃H₆ --> H + Cd^3^H₅)of reaction 1. In this model, energy- and angular momentum-dependent rate constants are calculated using the RRKM method in combination with themicrocanonical variational selection of the transition states. Pressure effects are described by solution of the master equation. Temperature and pressure dependences of he rate constants and product yields were investigated. The model wasused to predict the rate constants and branching fractions of reaction 1 at temperatures and pressures outside the experimental ranges. The same model was used to analyze kinetics of two other reactions which occur on the same potentialenergy surface: the thermal decomposition of propene (2) and the reaction of H atom with allyl radical, H + C₃H₅ --> C₃H₆ --> C₂H₃ + CH₃ (3). The results demonstrate the increasing importance of the CH₃ +C₂H₃ channels in both reactions 2 and 3 at high temperatures (above 1500 K).

Citation

Journal of Physical Chemistry A

Volume

106

Pub Type

Journals

Keywords

computational kinetics, mechanism, methyl radical, product yield, vinyl radical

Citation

Stoliarov, S. , Knyazev, V. and Slagle, I. (2002), Computational Study of the Mechanism and Product Yields in the Reaction Systems C2H3+CH3<>C3H6<>H+C3H5 and C2H3+CH3>CH4+C2H2, Journal of Physical Chemistry A (Accessed April 24, 2024)