Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 31 August 2019 / Approved: 1 September 2019 / Online: 1 September 2019 (09:02:29 CEST)

How to cite: Li, B.; Raj, A.; Croiset, E.; Wen, J.Z. Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation. Preprints 2019, 2019090005 Li, B.; Raj, A.; Croiset, E.; Wen, J.Z. Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation. Preprints 2019, 2019090005

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 have shown 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.

Subject Areas

soot oxidation; catalytic; heterogeneous catalysis; oxygen vacancies; iron doped ceria catalyst; ceria

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