Gd-Bi-M-Ce-O (M = Cu, Zr, Ni, Co, Mn) ceria-based solid solutions for low temperature CO oxidation

Ceria based solid solutions doped by Gd, Bi, and the third dopant were synthesized by the co-precipitation method with ultrasonic treatment, followed by calcination at the temperature of 500 degrees C. Characterization of the synthesized nanosystems by XRD, TEM, TG, Raman spectroscopy, FTIR, XPS was carried out. It is shown that all obtained powders of solid solutions crystallized into a cubic structure of the fluorite type, with an average particle size of 5-15 nm. The samples had a mesoporous structure of the pore diameter of 2-5 nm. The catalytic activity of Gd-Bi-M-Ce-O (M = Cu, Zr, Ni, Co, Mn) solid solutions was carried out. The catalyst Gd0.05Bi0.15Mn0.20Ce0.60O2 has the lowest oxidation temperature.

Automated summary

The Ceria-based solid solutions doped with Gd, Bi, and a third dopant were successfully synthesized using the co-precipitation method with ultrasonic treatment. The synthesized powders exhibited a cubic fluorite structure with an average particle size of 5-15 nm and a mesoporous structure with pore diameters of 2-5 nm. Among the solid solutions studied, the catalyst Gd0.05Bi0.15Mn0.20Ce0.60O2 showed the lowest oxidation temperature, indicating superior catalytic activity.