C-NO reaction in the presence of O2

Philippe Chambrion, Takashi Kyotani, Akira Tomita

Research output: Contribution to journalConference articlepeer-review

37 Citations (Scopus)

Abstract

The reactions of NO with pure carbons, phenol-formaldehyde resin char and amorphous 13C, were examined at 850 °C in the presence of O2. Previous studies revealed that some of the nitrogen in NO was trapped on the carbon surface, and it plays an important role in the C-NO reaction. In order to quantitatively investigate the formation and removal of N-containing complexes on the carbon surface, C(N), in the presence of O2, a detailed material balance in the course of NO reduction over the carbons, was established by using both mass spectrometer and gas chromatography. The presence of O2 greatly enhanced the NO reduction rate. It was found that the N2 and N2O production rates increased, whereas the accumulation of C(N) considerably decreased with increasing O2 concentration. The C-NO reaction mechanism in the presence of O2 was examined by step response experiments at 850 °C, where the reactant gas was switched from 14N16O/16O2 to 15N18O/18O2. Analysis of the product gases after the feed gas switch gives much information on the reaction pathways. It was suggested that the most dominant N2 formation route is the reaction between C(N) and NO gas under the present conditions. This mechanism is the same as observed previously in the absence of O2. The reaction of C(N) with O2 at 850 °C was also carried out, and the principal product was found to be N2 in the early stage and NO in the later stage. As one of the possible roles of O2 on the NO reduction by carbon, the increase of C(N) turnover by the action of O2 was suggested; that is, O2 assists the liberation of C(N) from the carbon surface to produce gaseous products.

Original languageEnglish
Pages (from-to)3053-3059
Number of pages7
JournalSymposium (International) on Combustion
Volume2
Publication statusPublished - 1998 Dec 1
EventProceedings of the 1998 27th International Symposium on Combustion - Boulder, CO, USA
Duration: 1998 Aug 21998 Aug 7

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Mechanical Engineering

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