Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

• Published in: Applied catalysis. B, Environmental Vol. 106; no. 3-4; pp. 621 - 629
• Main Authors: Laguna, O.H., Centeno, M.A., Boutonnet, M., Odriozola, J.A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 11.08.2011; Elsevier
• Subjects: Carbon monoxide; Catalysis; Chemistry; CO oxidation; Colloidal state and disperse state; Emulsions. Microemulsions. Foams; Exact sciences and technology; Fe-doped ceria; General and physical chemistry; Iron; Microemulsions; Oxidation; Oxides; Oxygen vacancies; Phases; Solid solutions; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Vacancies; Water-in-oil microemulsion; Oxygen vacancies; Water-in-oil microemulsion; Fe-doped ceria; CO oxidation; Binary compound; Oxygen; Reducibility; Support; Vacancy; Segregation; Transition element compounds; Transition metal; Iron; Cerium oxide; Solid solution; Solid; Lanthanide compound; Heterogeneous catalysis; Water oil microemulsion; Efficiency; Oxidation; Environmental protection
• ISSN: 0926-3373; 1873-3883; 1873-3883
• DOI: 10.1016/j.apcatb.2011.06.025

The synthesis of Fe-doped ceria oxides was carried out by microemulsions method, employing different Fe atomic percentages (at.%). The 10at.% Fe allows obtaining Ce–Fe solid solution with the higher oxygen vacancies content. This system presents the higher CO conversion during the TOX and PROX reactions. [Display omitted] • A series of Ce–Fe mixed oxides were synthesized by the microemulsions method. • Solid solution formation was established for all the Fe-doped systems. • The oxygen exchange is improved for all the Fe-doped systems. • The 10at.% Fe allows obtaining the maximum oxygen vacancies concentration. A series of Ce–Fe mixed oxides as well as the pure oxides were synthesized by the microemulsions method. The solid solution formation was established for all the Fe-doped systems and only a hardly noticeable segregation of α-Fe2O3 was appreciated for the solid with the maximum iron content (50at.% Fe). The oxygen exchange is improved for all the Fe-doped systems; however the 10at.% Fe appears as the optimal iron content for achieving the maximum oxygen vacancies concentration and the higher reducibility efficiency. The CO oxidation (TOX, PROX) is especially achieved for the solids with the lower iron contents but with a superior oxygen vacancies proportion. These Ce–Fe systems prepared from microemulsions are very attractive to be considered as supports for depositing active phases capable of enhancing oxygen exchange ability of the whole system, allowing higher CO oxidation abilities.