On the dependence of the rate of moist co oxidation on o2 concentration at atmospheric pressure.

J. F. Roesler, R. A. Yetter, F. L. Dryer

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Counter-intuitively, moist CO oxidation is experimentally shown to be inhibited by the addition of oxygen to stoichiometric mixtures at 1000 K and atmospheric pressure. At these conditions, oxygen essentially reduces the ratio of (H]/[OH) such that the consumption of HO2 occurs through chain-terminating rather than chain propagating reactions. Although multiple sets of reactions are active in this transition, the principal effect results from a transition from HO2 + H → OH + OH to HO2 + OH → H2O-O2and Ho2+O→OH+O2as oxygen concentration is increased. As temperature is increased these reactions have a lesser influence on the O, H and OH radical pool due to the reduced production of HO2- Near 1040 K, the inhibition effects cease to be observed and the reaction rate is essentially independent of oxygen concentration. At higher temperatures still, previous experiments have shown that oxygen addition increases the rate of CO consumption. These experimental trends are qualitatively predicted by a comprehensive mechanism for C0/H2/O2oxidation developed previously. Quantitative predictions can be obtained by updating the rate of HO2 + OH→ H20+O2 to the values given by recently published reviews of low temperature data and to new high temperature experimental data.

Original languageEnglish (US)
Pages (from-to)161-171
Number of pages11
JournalCombustion science and technology
Volume95
Issue number1-6
DOIs
StatePublished - Dec 1 1993

Fingerprint

Atmospheric pressure
atmospheric pressure
Oxygen
Oxidation
oxidation
oxygen
Carbon Monoxide
Temperature
stopping
Reaction rates
counters
reaction kinetics
trends
predictions
Experiments
temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

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abstract = "Counter-intuitively, moist CO oxidation is experimentally shown to be inhibited by the addition of oxygen to stoichiometric mixtures at 1000 K and atmospheric pressure. At these conditions, oxygen essentially reduces the ratio of (H]/[OH) such that the consumption of HO2 occurs through chain-terminating rather than chain propagating reactions. Although multiple sets of reactions are active in this transition, the principal effect results from a transition from HO2 + H → OH + OH to HO2 + OH → H2O-O2and Ho2+O→OH+O2as oxygen concentration is increased. As temperature is increased these reactions have a lesser influence on the O, H and OH radical pool due to the reduced production of HO2- Near 1040 K, the inhibition effects cease to be observed and the reaction rate is essentially independent of oxygen concentration. At higher temperatures still, previous experiments have shown that oxygen addition increases the rate of CO consumption. These experimental trends are qualitatively predicted by a comprehensive mechanism for C0/H2/O2oxidation developed previously. Quantitative predictions can be obtained by updating the rate of HO2 + OH→ H20+O2 to the values given by recently published reviews of low temperature data and to new high temperature experimental data.",
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On the dependence of the rate of moist co oxidation on o2 concentration at atmospheric pressure. / Roesler, J. F.; Yetter, R. A.; Dryer, F. L.

In: Combustion science and technology, Vol. 95, No. 1-6, 01.12.1993, p. 161-171.

Research output: Contribution to journalArticle

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