Conformational inversion-topomerization mechanism of ethylcyclohexyl isomers and its role in combustion kinetics

Huiting Bian, Zhandong Wang, Jinhua Sun, Feng Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

With the "strain-free" cyclic structure, cyclohexane and alkyl cyclohexanes (and their radicals) have various conformers (e.g. chair, boat, and twist etc.) by pseudorotation of the alkyl ring. Noting that different conformers will undergo different types of H-migration reactions, the mechanism of conformational change may impact the distribution of cyclohexyl and the branched cyclohexyl radical isomers during cyclohexane and alkyl cyclohexanes combustion. Consequently, it will influence the formation of subsequent decomposition products. In this work, the conformational inversion-topomerization mechanism and H-migration reactions for six ethylcyclohexyl radical isomers were systematically studied by ab initio calculations and the transition state theory. The updated sub-mechanism of these conformational changes is incorporated into an ethylcyclohexane pyrolysis model. By comparing the simulated results of the "complete" model including the sub-mechanism of conformational changes and the simplified model ignoring these processes, the effect of inversion-topomerization mechanism on the relative concentrations of various ethylcyclohexyl radicals and the formation of subsequent decomposition products were revealed. © 2016.
Original languageEnglish (US)
Pages (from-to)237-244
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number1
DOIs
StatePublished - Jul 26 2016

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