Influence of Vanadium or Cobalt Oxides on the CO Oxidation Behavior of Au/MOx/CeO2–Al2O3 Systems
Tomás Ramírez Reina
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorAndrea Álvarez Moreno
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorDr. Svetlana Ivanova
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorProf. Dr. José Antonio Odriozola
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorCorresponding Author
Dr. Miguel Angel Centeno
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665Search for more papers by this authorTomás Ramírez Reina
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorAndrea Álvarez Moreno
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorDr. Svetlana Ivanova
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorProf. Dr. José Antonio Odriozola
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Search for more papers by this authorCorresponding Author
Dr. Miguel Angel Centeno
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665
Instituto de Ciencia de Materiales de Sevilla, Centro mixto, Universidad de Sevilla–CSIC, Avenida Americo Vespucio 49, 41092 Sevilla (Spain), Fax: (+34) 954460665Search for more papers by this authorGraphical Abstract
And cobalt takes the gold: Vanadium-doped catalysts (with or without gold) are less active than those with a non-doped support, owing to the loss of the oxygen storage/release properties of the Ce4+/Ce3+ redox pair in the crystallization of CeVO4. Cobalt doping enhances the catalytic performance of the support; the activity depends on the loading of cobalt, which forms a submonolayer in the support surface.
Abstract
A series of V2O5- and Co3O4-modified ceria/alumina supports and their corresponding gold catalysts were synthesized and their catalytic activities evaluated in the CO oxidation reaction. V2O5-doped solids demonstrated a poor capacity to abate CO, even lower than that of the original ceria/alumina support, owing to the formation of CeVO4. XRD, Raman spectroscopy, and H2-temperature programmed reduction studies confirmed the presence of this stoichiometric compound, in which cerium was present as Ce3+ and its redox properties were avoided. Co3O4-doped supports showed a high activity in CO oxidation at subambient temperatures. The vanadium oxide-doped gold catalysts were not efficient because of gold particle agglomeration and CeVO4 formation. However, the gold–cobalt oxide–ceria/alumina catalysts demonstrated a high capacity to abate CO at and below room temperature. Total conversion was achieved at −70 °C. The calculated apparent activation energy values revealed a theoretical optimum loading of a half-monolayer.
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