Copper-promoted ceria catalysts for CO oxidation reaction

• Published in: Catalysis today 2020-09, Vol.355, p.647-653
• Main Authors: Papadopoulos, Christos, Kappis, Konstantinos, Papavasiliou, Joan, Vakros, John, Kuśmierz, Marcin, Gac, Wojciech, Georgiou, Yiannis, Deligiannakis, Yiannis, Avgouropoulos, George
• Format: Article
• Language: English
• Subjects: Atomically dispersed catalyst; Ceria; CO oxidation; Copper; Hydrothermal
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.06.078

[Display omitted] •Novel hydrothermal method for copper-promoted ceria catalysts.•Copper ions finely and atomically dispersed in ceria-based catalysts.•EPR analysis revealed the origin of higher catalytic activity.•CO oxidation activity dependent on the nature of atomically dispersed Cu2+ clusters.•Specific surface area and concentration of oxygen vacancies play minor role. A hydrothermal method employing citric acid as the chelating agent and sodium hydroxide as the precipitating agent, and different copper precursors (nitrate salt and metallic ring) has been applied in this work for the synthesis of atomically dispersed copper-ceria catalysts. These catalysts were evaluated in CO oxidation reaction. Copper ions were finely and atomically dispersed in both catalysts and strong interaction between copper supported species and ceria resulted in a remarkable promotion of the activity, thus playing a crucial role in the achievement of higher performance in contrary to other physicochemical properties such as specific surface area and defects concentrations, which seem to play a minor role.