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Open AccessArticle

Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation

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Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L3G1, Canada
2
Department of Mechanical & Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L3G1, Canada
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(10), 815; https://doi.org/10.3390/catal9100815
Received: 31 August 2019 / Revised: 24 September 2019 / Accepted: 25 September 2019 / Published: 28 September 2019
(This article belongs to the Special Issue Diesel Soot Catalysis)
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. View Full-Text
Keywords: soot oxidation; catalytic; heterogeneous catalysis; oxygen vacancies; iron-doped ceria catalyst; ceria soot oxidation; catalytic; heterogeneous catalysis; oxygen vacancies; iron-doped ceria catalyst; ceria
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MDPI and ACS Style

Li, B.; Raj, A.; Croiset, E.; Wen, J.Z. Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation. Catalysts 2019, 9, 815.

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