Abstract
NO oxidation was studied over Pt/CeO2 and Pt/SiO2 catalysts. Apparent activation energies (E a) of 31.4 and 40.6 kJ/mole were determined for Pt/CeO2 and Pt/SiO2, respectively, while reaction orders for NO and O2 were fractional and positive for both catalysts. Pre-treatment of the catalysts with SO2 caused a decrease in the E a values, while the reaction orders were only slightly changed. In situ DRIFTS measurements indicated that high concentrations of nitrate species were formed on the surface of Pt/CeO 2 during NO oxidation, while almost no surface species could be detected on Pt/SiO2. The addition of SO2 resulted in the formation of a highly stable sulfate at the expense of nitrate species and caused an irreversible loss of catalytic activity for Pt/CeO2.
| Original language | English |
|---|---|
| Pages (from-to) | 29-37 |
| Number of pages | 9 |
| Journal | Catalysis Letters |
| Volume | 110 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Aug 2006 |
Funding
The authors thank Dr. Gerald Thomas for performing the XRF measurements, Mr. Dennis Sparks for experimental assistance, and Dr. Mark Keane for helpful discussions. This publication was prepared with the support of the U.S. Department of Energy, under Awards No. DE-FG26-04NT42197 and DE-FC26-05NT42631. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy |
Keywords
- Ceria
- Nitric oxide
- Oxidation
- Platinum
- Silica