Ab initio kinetics for the decomposition of hydroxybutyl and butoxy radicals of n-butanol

Peng Zhang, Stephen J. Klippenstein, Chung King Law

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29 Scopus citations

Abstract

The decomposition kinetics of the hydroxybutyl and butoxy radicals (C 4H9O) arising via H abstraction from n-butanol were studied theoretically with ab initio transition-state-theory-based master equation analyses. Stationary points on the C4H9O potential energy surface were calculated at either the RQCISD(T)/CBS//B3LYP/6- 311++G(d,p) level or the RQCISD(T)/CBS//CASPT2/aug-cc-pVDZ level. Unimolecular pressure- and temperature-dependent rate coefficients were calculated over broad ranges of temperature (300-2500 K) and pressure (1.3 × 10-3 to 102 atm) by solving the time-dependent multiple-well master equation. The "well merging" phenomenon was observed and analyzed for its influence on the branching ratios and rate coefficients. The theoretical predictions were compared with the available experimental and theoretical data and any discrepancies were analyzed. The predicted rate coefficients are represented with forms that may readily be used in combustion modeling of n-butanol.

Original languageEnglish (US)
Pages (from-to)1890-1906
Number of pages17
JournalJournal of Physical Chemistry A
Volume117
Issue number9
DOIs
StatePublished - Mar 7 2013

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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