Features of low-temperature oxidation of isobutane in water vapor and carbon dioxide with increased density of reagents

A. A. Vostrikov, O. N. Fedyaeva, A. V. Shishkin, D. O. Artamonov, M. Ya Sokol

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The oxidation of isobutane at high density of reagents in a mixture of i-C4H10/O2/H2O and i-C4H10/O2/CO2 with oxygen deficiency (a molar ratio [O2]0/[i-C4H10]0 = 3.5–5.8) has been studied for the first time. The experiments were carried out in a tubular reactor under uniform heating (1 K/min) to 590 K. Data on the kinetics, auto-ignition temperature, and the products of isobutane conversion have been obtained. The auto-ignition was found to be a two-stage process and begin at a temperature of 510–522 K. The heat capacity of the reaction mixture suppressed the autoacceleration of the oxidation. Mass spectrometric analysis of the reactants revealed a difference in the mechanisms of isobutane conversion in water vapor and carbon dioxide. In water vapor, the oxidation is dominant and is realized with the participation of vibrationally excited O*2 molecules, which appear mainly from resonant exchange with H2O* molecules. In the CO2 medium, the oxidation proceeds against the background of intense isobutane dissociation, initiated by the vibrational pumping of i-C4H10 molecules in their resonant excitation by CO*2 molecules.

Original languageEnglish
Pages (from-to)466-475
Number of pages10
JournalJournal of Engineering Thermophysics
Volume26
Issue number4
DOIs
Publication statusPublished - 1 Oct 2017

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