| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 65244 | Journal of Molecular Catalysis A: Chemical | 2015 | 7 Pages |
•Ce0.33Zr0.67O2 solid solution was formed in Pt–Ru/Ba/Al2O3–Ce0.33Zr0.67O2.•The addition of Ru improves performances of NOx storage and reduction.•The addition of Ru decreases reduction temperature of Pt.•The addition of Ru promotes the oxidation of nitrite to nitrate.
An effective catalyst of NOx storage and reduction (NSR), Pt–Ru/Ba/ACZ (ACZ = Al2O3–Ce0.33Zr0.67O2), has been presented through using ACZ as a support. The catalyst was well characterized by XRD, TEM, N2 physisorption, H2-TPR and XPS. Ce0.33Zr0.67 solid solution was formed in the catalyst. The effects of Ru addition on NSR performances were investigated. In comparison with Pt/Ba/ACZ, the addition of Ru in Pt–Ru/Ba/ACZ drops the reduction temperature of Pt, an obvious promoting effect on NSR was observed above 200 °C. The presence of 5 vol% CO2 in feed gas shows an inhibiting effect on NOx storage and reduction.
Graphical abstractPt–Ru/Ba/Al2O3–Ce0.33Zr0.67O2 shows superior performances in NOx storage and reduction to Pt/Ba/Al2O3–Ce0.33Zr0.67O2. The addition of Ru has resulted in decrement of the reduction temperature of Pt and the transformation temperature of NOx storage route from nitrite to nitrate.Figure optionsDownload full-size imageDownload high-quality image (169 K)Download as PowerPoint slide
