Pyrolysis of ethyl iodide as hydrogen atom source: Kinetics and mechanism in the temperature range 950-1200 K

Tobias Bentz, Milan Szori, Béla Viskolcz, Matthias Olzmann

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Ethyl iodide is a well known H atom precursor in shock tube experiments. In the present work, we study peculiarities, when C2H5I is used under conditions, where its decomposition is not longer fast compared to the consecutive bimolecular reactions of the H atoms. On the basis of shock tube experiments with detection of H and I atoms by resonance absorption spectrometry, accompanied by quantum chemical (CCSD(T)/6-311G(d, p)//CCSD(T)/6-311G(d, p)) and statistical rate theory calculations, we propose a small mechanism (5 reactions, 7 species) and kinetic data, which allow an adequate description of C2H5I pyrolysis as a H atom source down to temperatures between 950 and 1200 K at pressures ranging from 1 to 4 bar: C2H 5I → C2H5 + I (1), k1 = 9.9 × 1012exp(-23 200 K/T) s-1; C2H 5 +M → C2H4 + H + M (2), k2 = 1.7 × 10-6exp(-16800 K/T) cm3 s-1 [D. L. Baulch et al., J. Phys. Chem. Ref. Data 34 (2005) 757]; C2H 5I → C2H4 + HI (3), k3 = 1.7 × 1013 exp(-26680 K/T) s-1; H + HI → H 2 +I (4), k4 = 7.9 × 10-11 exp(-330 K/T) cm3 s-1 [D. L. Baulch et al., J. Phys. Chem. Ref. Data 10 (Suppl. 1) (1981) 1]; C2 H5I + H → C 2H5 +HI (5), k5 =7.0 × 10-9 exp(-3940K/T)cm3 s-1. The latter bimolecular abstraction step turned out crucial for an adequate description of the hydrogen atom concentration-time profiles in the above mentioned temperature and pressure range for initial concentrations [C2H5I]0 > 2 × 1013 cm-3 corresponding to mole fractions > 1 ppm.

Original languageEnglish
Pages (from-to)1117-1128
Number of pages12
JournalZeitschrift fur Physikalische Chemie
Volume225
Issue number9-10
DOIs
Publication statusPublished - Oct 1 2011

Keywords

  • Chemical kinetics
  • Elementary reactions
  • Ethyl iodide
  • Hydrogen atom
  • Shock tube

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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