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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chan, Denise Gremminger, Andreas Deutschmann, Olaf |
| Copyright Year | 2013 |
| Abstract | Fuel consumption for NO$_{x}$ trap regeneration depends on the regeneration frequency, which is a function of NO$_{x}$ trap performance parameters. Hence, the impact of thermal aging must be considered in the operation strategy. For this purpose, the effect of thermal aging on the physical and chemical properties of a commercial NO$_{x}$ storage/reduction catalyst containing Pt/Pd/Rh has been investigated. After thermal treatment under various conditions, the samples were characterized using CO chemisorption measurements, X-ray diffraction (XRD), N$_{2}$ physisorption, and electron microscopy. It is shown that the major impact of lean hydrothermal treatment on the catalyst activity is the continuous decrease of the specific surface area with aging temperature due to collapse of smaller pores. The noble metal nanoparticles remained highly dispersed, even after lean aging at 800 °C. In contrast, noble metal sintering represents the main aging effect of lean/rich cycling at elevated temperatures. Furthermore, XRD and selected area electron diffraction revealed a significant loss of crystallinity for the barium component in consequence of lean/rich aging treatment. However, independent from the aging treatment, no formation of mixed oxides could be observed. |
| Starting Page | 293 |
| Ending Page | 297 |
| Page Count | 5 |
| File Format | |
| ISSN | 10225528 |
| Journal | Topics in Catalysis |
| Volume Number | 56 |
| Issue Number | 1-8 |
| e-ISSN | 15729028 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2013-02-27 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Commercial NO$_{x}$ storage/reduction catalyst Aging XRD BET HR-TEM/EDX CO chemisorption Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Catalysis |
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