Nitrogen production efficiency for acetaldehyde and propionaldehyde in lean NOx reduction over anatase titania

Anguelina P. Kozlova, Hiu Ying Law, Mayfair C. Kung*, Harold H. Kung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The nitrogen formation efficiencies, defined as the number of nitrogen molecules formed for every reductant molecule consumed were determined for acetaldehyde and propionaldehyde in the reduction of NO2 under lean conditions over anaiase TiO2. The efficiency increased with increasing NO2/reductant in the feed, reaching 0.61 ± 0.05 for NO2/'acetaldehyde between 1.5 and 3.0 and 0.85 ± 0.08 for NO2/propionaldehyde between 3.8 and 5.7. Simultaneously, the CO/CO2 ratio as well as the small concentration of N2O in the product stream increased. The results suggested that at higher NO 2/reductant ratios, the reaction between the reductant and adsorbed NO2 accounted for a large majority of the reaction. The results were consistent with the IR results, which showed that surface nitro groups reacted readily with acetaldehyde. The implications of these results on the NO 2 reduction mechanism were discussed.

Original languageEnglish (US)
Pages (from-to)211-217
Number of pages7
JournalCatalysis Letters
Issue number3-4
StatePublished - Jun 2004


  • Acetaldehyde
  • NO
  • Propionaldehyde
  • Reduction
  • Titania

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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