Effect of gallia doping on the acid–base and redox properties of ceria

This work presents the synthesis and characterization of cerium oxide doped with gallium, which were prepared by co-precipitation in basic aqueous solution followed by calcination at 773 K. XRD and Raman spectroscopy suggested that Ga(III) cations were incorporated into the ceria crystal structure. Moreover, surface Ga-H species were detected by FTIR with a 100 cm−1 downshift of the ν(Ga-H) peak, which indicated that Ga(III) were incorporated onto the surface lattice of the ceria. Results of CO2 and CO chemisoption, as well as, TPR-H2 and TPR-CO, showed that the acid–base (decreased basicity) and redox (enhanced reducibility) properties of the gallium-doped ceria materials were modified as compared with the pure cerium dioxide. The catalytic oxidation of CO was investigated over the oxides.

Graphical abstract. Cerium oxide doped with gallium have been prepared and characterized structurally and chemically. Results indicate that Ga(III) was incorporated onto the lattice of the ceria. Redox (enhanced reducibility) and acid–base (decreased basicity) properties of the gallium-doped ceria materials were modified as compared with the pure cerium dioxide.Figure optionsDownload full-size imageDownload high-quality image (71 K)Download as PowerPoint slideResearch highlights▶ Synthesis of cerium oxide doped with gallium, prepared by co-precipitation. ▶ XRD, Raman and Infrared data suggested that Ga(III) cations were incorporated into the ceria lattice. ▶ Acid–base and redox properties were modified.