Surface and redox properties of cobalt–ceria binary oxides: On the effect of Co content and pretreatment conditions

摘要: Abstract Ceria-based transition metal catalysts have recently received considerable attention both in heterogeneous catalysis and electro-catalysis fields, due to their unique physicochemical characteristics. Their catalytic performance is greatly affected by the surface local chemistry oxygen vacancies. The present study aims at investigating impact of Co/Ce ratio pretreatment conditions on redox properties cobalt–ceria binary oxides. Co–ceria mixed oxides with different Co content (0, 20, 30, 60, 100 wt.%) were prepared impregnation method characterized means N2 adsorption −196 °C, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR) photoelectron spectroscopy (XPS). results shown improved reducibility Co/CeO2 compared single oxides, a synergistic interaction between cobalt cerium. Oxidation preferential localization cerium species outer surface. In contrast, uniform distribution over entire catalyst obtained process, which facilitates formation vacancies though Co3+/Co2+ Ce3+/Ce4+ cycles. Fundamental insights toward tuning are provided, paving way for real-life industrial applications.