Exafs study of ceria-lanthana-based TWC promoters prepared by sol-gel routes (Articolo in rivista)

Type
Label
  • Exafs study of ceria-lanthana-based TWC promoters prepared by sol-gel routes (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Deganello F.; Longo A.; Martorana A. (2003)
    Exafs study of ceria-lanthana-based TWC promoters prepared by sol-gel routes
    in Journal of solid state chemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Deganello F.; Longo A.; Martorana A. (literal)
Pagina inizio
  • 289 (literal)
Pagina fine
  • 293 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 175 (literal)
Rivista
Note
  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ISMN-CNR, via Ugo La Malfa, 153, Palermo I-90146, Italy Dipartimento di Chimica, Inorganica e Analitica ''Stanislao Cannizzaro'', Universita` di Palermo, Viale delle Scienze, Palermo I-90128, Italy (literal)
Titolo
  • Exafs study of ceria-lanthana-based TWC promoters prepared by sol-gel routes (literal)
Abstract
  • Extended X-ray absorption fine structure (EXAFS) experiments at the Ce K- and La K-edges were performed on ceria–lanthana– alumina three-way catalysts promoters prepared by sol–gel routes, in order to investigate the effect of lanthanum doping on the ceria structure. The formation of Ce1-xLaxO2-x/2 solid solution, already observed by X-ray diffraction, was confirmed by EXAFS analysis, while no experimental evidence of a Ce–Al interaction was found. In presence of cerium and aluminum, lanthanum is involved in the formation of solid solution with CeO2 and of La–Al compounds. When the La:Al molar ratio is sufficiently high, the growth of a tridimensionally ordered LaAlO3 perovskite compound is observed. For increasing values of x/1-x in the solid solution Ce1-xLaxO2-x/2, the Ce–O distance decreases, while La–O distance remains nearly constant. (literal)
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