Isotopic Transient Kinetic Analysis of Soot Oxidation on Mn<sub>3</sub>O<sub>4</sub>, Mn<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>, and CeO<sub>2</sub> Catalysts in Tight Contact Conditions
The reaction mechanism of soot oxidation on Mn (Mn<sub>3</sub>O<sub>4</sub>), Mn-Ce (Mn<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>), and Ce (CeO<sub>2</sub>) catalysts in tight contact conditions was investigated using ITKA (isoto...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/2/343 |
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| Summary: | The reaction mechanism of soot oxidation on Mn (Mn<sub>3</sub>O<sub>4</sub>), Mn-Ce (Mn<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>), and Ce (CeO<sub>2</sub>) catalysts in tight contact conditions was investigated using ITKA (isotopic transient kinetic analysis). The obtained results suggest that lattice-bulk oxygen from all studied catalysts takes part in the soot oxidation process but with varying relative contributions: for the Ce catalyst, this contribution is practically 100%, whereas with decreasing Ce content in Mn-Ce catalysts, the significance of lattice-bulk oxygen for soot oxidation diminishes. For the Mn catalyst, it is estimated to be below 50%. Moreover, strong interactions between Mn and Ce ions were observed, increasing oxygen mobility in the catalyst crystal lattice and affecting the activity of Mn-Ce catalysts. |
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| ISSN: | 1420-3049 |