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- W2022910000 endingPage "10549" @default.
- W2022910000 startingPage "10531" @default.
- W2022910000 abstract "Despite its use in a wide variety of industrially important thermochemical processes, little is known about the thermal decomposition mechanism of dimethyl disulfide (DMDS). To obtain more insight, the radical decomposition mechanism of DMDS is studied theoretically and a kinetic model is developed accounting for the formation of all the decomposition products observed in the experimental studies available in literature. Thermochemical data and rate coefficients are obtained using the high-level CBS-QB3 composite method. Among five methods tested (BMK/6-311G(2d,d,p), MPW1PW91/6-311G(2d,d,p), G3, G3B3, and CBS-QB3), the CBS-QB3 method was found to reproduce most accurately the experimental standard enthalpies of formation for a set of 17 small organosulfur compounds and the bond dissociation energies for a set of 10 sulfur bonds. Enthalpies of formation were predicted within 4 kJ mol−1 while the mean absolute deviation on the bond dissociation enthalpies amounts to 7 kJ mol−1. From the theoretical study, a new reaction path is identified for the formation of carbon disulfide via dithiirane (CH2S2). A reaction mechanism was constructed containing 36 reactions among 25 species accounting for the formation of all the decomposition products reported in literature. High-pressure limit rate coefficients for the 36 reactions in the reaction mechanism are presented. The kinetic model is able to grasp the experimental observations. With the recombination of thiyl radicals treated as being in the low-pressure limit, the experimentally reported first-order rate coefficients for the decomposition of DMDS are reproduced within 1 order of magnitude, while the observed product selectivities of most compounds are reproduced satisfactory. Simulations indicate that at high conversions most of the carbon disulfide forms according to the newly identified reaction path involving the formation of dithiirane." @default.
- W2022910000 created "2016-06-24" @default.
- W2022910000 creator A5017036680 @default.
- W2022910000 creator A5025020201 @default.
- W2022910000 creator A5073346951 @default.
- W2022910000 date "2010-09-15" @default.
- W2022910000 modified "2023-10-03" @default.
- W2022910000 title "Theoretical Study of the Thermal Decomposition of Dimethyl Disulfide" @default.
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- W2022910000 doi "https://doi.org/10.1021/jp103357z" @default.
- W2022910000 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20843049" @default.
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