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- Title
Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation.
- Authors
Li, Boyu; Raj, Abhishek; Croiset, Eric; Wen, John Z.
- Abstract
This study investigates the role of oxygen vacancy on Fe-doped CeO2 catalyst activity for soot oxidation. The oxygen vacancy was assessed through Ce3+ content. The Fe content was varied between 0 and 30% for two catalyst preparation methods, co-precipitation (CP) and solution combustion synthesis (SCS). X-ray photoelectron spectroscopy indicates that ceria exists as both Ce4+ and Ce3+, while iron is present only as Fe3+. The catalyst's activity was evaluated by ignition (T10) and combustion (T50) temperatures using thermogravimetric analysis. Optimum Fe contents yielding the highest activity were found to be 10% and 5% for CP and SCS catalysts, respectively. The surface area and morphology showed a moderate effect on catalyst activity, because catalytic soot oxidation involves solid–solid contact. More importantly, regardless of the fabrication method, it was found that Ce3+ content, which is closely related to oxygen vacancies, plays the most important role in affecting the catalyst activity.
- Subjects
OXIDATION of carbon monoxide; IGNITION temperature; WATER gas shift reactions; SOOT; CERIUM oxides; SELF-propagating high-temperature synthesis; X-ray photoelectron spectroscopy; CATALYSTS
- Publication
Catalysts (2073-4344), 2019, Vol 9, Issue 10, p815
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal9100815