Effect of Gallia Doping on the Acid-Base and Redox Properties of Ceria

S. COLLINS; G. FINOS; R. ALCÁNTARA; E. DEL RÍO; S. BERNAL; A. BONIVARDI

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2010 vol. 388 p. 202 - 210

0926-860X

This work presents the synthesis and characterization of cerium oxide doped with gallium, which wereprepared by co-precipitation in basic aqueous solution followed by calcination at 773 K. XRD and Ramanspectroscopy suggested that Ga(III) cations were incorporated into the ceria crystal structure. Moreover,surface Ga-H species were detected by FTIR with a 100cm−1 downshift of the v(Ga-H) peak, whichindicated that Ga(III) were incorporated onto the surface lattice of the ceria. Results of CO2 and COchemisoption, 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 withthe pure cerium dioxide. The catalytic oxidation of CO was investigated over the oxides.