Zirconia supported La, Co, oxides and LaCoO3 perovskite: structural characterization and catalytic CO oxidation
Academic Article
Publication Date:
2002
abstract:
ZrO2-supported La, Co oxide catalysts with different La, Co loading (2, 6,
8, 12 and 16wt.% as LaCoO3) were prepared by impregnation of tetragonal
ZrO2 with equimolar amounts of La and Co citrate precursors and
calcination at 1073K. The catalysts were characterized by X-ray
diffraction (XRD), X-ray absorption spectroscopy (XAS), and BET specific
surface area determination. Catalytic CO oxidation was performed at 298
800K. XRD revealed the presence of tetragonal zirconia with traces of the
monoclinic phase. LaCoO3 perovskite was also detected for loading higher
than 6%. XAS experiments suggested that at high loading LaCoO3 and Co3O4
were formed, while at low loading, La, Co oxide species interacting with
support, and hard to be structurally defined, prevailed. The catalysis
study evidenced that the catalytic activity was due to segregated and
highly dispersed cobalt oxide species.
8, 12 and 16wt.% as LaCoO3) were prepared by impregnation of tetragonal
ZrO2 with equimolar amounts of La and Co citrate precursors and
calcination at 1073K. The catalysts were characterized by X-ray
diffraction (XRD), X-ray absorption spectroscopy (XAS), and BET specific
surface area determination. Catalytic CO oxidation was performed at 298
800K. XRD revealed the presence of tetragonal zirconia with traces of the
monoclinic phase. LaCoO3 perovskite was also detected for loading higher
than 6%. XAS experiments suggested that at high loading LaCoO3 and Co3O4
were formed, while at low loading, La, Co oxide species interacting with
support, and hard to be structurally defined, prevailed. The catalysis
study evidenced that the catalytic activity was due to segregated and
highly dispersed cobalt oxide species.
Iris type:
01.01 Articolo in rivista
List of contributors:
DE ROSSI, Sergio; Colonna, Stefano
Published in: