Catalytic reduction of nitric oxide by carbon monoxide over calcined limestone: reversible deactivation in the presence of carbon dioxide

Kim Dam-Johansen*, Peter F. B. Hansen, Søren Rasmussen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The influence of carbon dioxide on nitric oxide reduction by carbon monoxide catalyzed over a porous limestone Stevns Chalk was studied in a fixed bed quartz reactor at 850°C under alternating oxidizing and reducing conditions, and under constant reducing conditions. The presence of carbon dioxide was found to inhibit the catalytic nitric oxide reduction. The nitric oxide reduction by carbon monoxide was found to fit the power law expression - rNO = k · [NO]1 · [CO](0.8 - 0.9) · [CO2]-0.7 at ambient pressures, for 300-1200 ppmv NO, 2-6 vol.-% CO and 2-16 vol.-% CO2. A simple mechanism for the nitric oxide reduction is proposed and a rate expression which agrees with the experimental results is derived. This study indicates that investigations of nitric oxide reduction by carbon monoxide catalyzed by CaO should be carried out in the presence of relevant concentrations of carbon dioxide.

Original languageEnglish
JournalApplied Catalysis B, Environmental
Volume5
Issue number4
Pages (from-to)283-304
ISSN0926-3373
DOIs
Publication statusPublished - 1995

Keywords

  • Calcium oxide
  • Carbon dioxide
  • Carbon monoxide oxidation
  • Kinetics
  • Mechanism
  • Nitric oxide reduction

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