Hydrocarbon-NOx interactions at low temperatures-1.Conversion of NO to NO2 promoted by propane and the formation of HNCO

P. F. Nelson*, B. S. Haynes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Reactant conversions and product distributions for reactions between NO (0-350 ppm), propane (425-1000 ppm), and O2 (2.3-16%) in a laminar flow reactor at temperatures in the range 500°C-800°C have been determined by long-path-length Fourier transform infrared (FTIR) spectroscopy. Addition of NO significantly decreases the temperature at which oxidation of propane commences, but the formation of intermediate products (the olefins, ethylene and propylene, and formaldehyde) occurs over a wider temperature range than does the formation of these products in the absence of added NO. Oxidation of the propane coincides with NO to NO2 conversion, although significant NO to NO2 conversion, occurs before substantial oxidation of the hydrocarbon. The NO to NO2 conversion occurs in stages and increases when the intermediate carbon-containing products begin themselves to oxidise. For experiments in the presence of added NO, CH4 is not observed as a product, implying that steady-state concentrations of CH3 radicals are low; rapid conversion of CH3 to CH3O2 followed by reaction of CH3O2 with NO is a probable reason for this observation. At high NO and propane concentrations (350 and 1000 ppm, respectively), HNCO was detected as a product of these reactions. Formation of HNCO coincides with NO to NO2 conversion. These observations provide evidence for hydrocarbon-NO interactions that result in the formation of species containing C-N bonds occurring at lower temperatures than previously reported.

Original languageEnglish
Pages (from-to)1003-1010
Number of pages8
JournalSymposium (International) on Combustion
Volume25
Issue number1
DOIs
Publication statusPublished - 1994
Externally publishedYes

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