Gold catalysts supported on cerium-gallium mixed oxide for the carbon monoxide oxidation and water gas shift reaction

J. VECCHIETTI; S. COLLINS; J.J. DELGADO; M. MALECKA; E. DEL RÍO; X. CHEN; S. BERNAL; A. BONIVARDI

TOPICS IN CATALYSIS

SPRINGER/PLENUM PUBLISHERS

Lugar: New York; Año: 2011 vol. 54 p. 201 - 209

1022-5528

The synthesis, characterization and catalyticproperties of gold supported on ceria, gallia and a cerium–gallium mixed oxide were investigated. The nanostructuralcharacterization of the cerium–gallium support (nominalatomic composition Ce80Ga20) showed that gallium(III)cations are homogenously distributed into the ceria matrixby substituting cerium(IV) cations of the fluorite-typestructure of ceria. Au was added to the supports by thedeposition–precipitation method using urea. High Au dispersionswere achieved for all the fresh materials(D[60%). The CO oxidation and the water gas shift(WGS) reaction were tested on the whole set of catalysts.All the supported-gold catalysts showed high activity forthe CO oxidation reaction. However, those containinggallium in their formulation deactivated due to gold particlesinterization. Au(2%)/CeO2 was the most activematerial for the WGS reaction, and the Au(2%)/Ce80Ga20was as active as a Au(3%)/Ce68Zr32 catalyst for COoxidation, and even more active than the reference catalystof the World Gold Council, Au(2%)/TiO2