Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 211-217 |
| Number of pages | 7 |
| Journal | Catalysis Letters |
| Volume | 95 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jun 2004 |
Funding
We like to thank Dr. Bernd Proft of Sachtleben Chemie for the anatase TiO2 sample. This work was supported by the EMSI program of the National Science Foundation and the U.S. Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis.
Keywords
- Acetaldehyde
- NO
- Propionaldehyde
- Reduction
- Titania
ASJC Scopus subject areas
- Catalysis
- General Chemistry