Niobium-silica catalysts for the selective epoxidation of cyclic alkenes: the generation of the active site by grafting niobocene dichloride (Articolo in rivista)

Type
Label
  • Niobium-silica catalysts for the selective epoxidation of cyclic alkenes: the generation of the active site by grafting niobocene dichloride (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/c3cp51570b (literal)
Alternative label
  • Tiozzo, Cristina; Bisio, Chiara; Carniato, Fabio; Gallo, Alessandro; Scott, Susannah L.; Psaro, Rinaldo; Guidotti, Matteo (2013)
    Niobium-silica catalysts for the selective epoxidation of cyclic alkenes: the generation of the active site by grafting niobocene dichloride
    in PCCP. Physical chemistry chemical physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Tiozzo, Cristina; Bisio, Chiara; Carniato, Fabio; Gallo, Alessandro; Scott, Susannah L.; Psaro, Rinaldo; Guidotti, Matteo (literal)
Pagina inizio
  • 13354 (literal)
Pagina fine
  • 13362 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 15 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 32 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR Inst Mol Sci & Technol; University of Eastern Piedmont Amedeo Avogadro; University of California Santa Barbara; University of California Santa Barbara (literal)
Titolo
  • Niobium-silica catalysts for the selective epoxidation of cyclic alkenes: the generation of the active site by grafting niobocene dichloride (literal)
Abstract
  • Niobium-containing silica materials obtained by deposition via liquid-phase grafting or dry impregnation of niobocene(IV) dichloride are active and selective catalysts in the epoxidation of alkenes in the presence of aqueous hydrogen peroxide. The generation of the catalytically-active Nb species was followed step-by-step, and investigated using a combined DR-UV-Vis, NIR, Raman, XRD, XANES and EXAFS analyses. At the end of the grafting procedure, the nature of the surface active species can be described as an oxo-Nb(V) site, tripodally grafted onto the silica surface in close proximity to other Nb(V) centres. The liquid-phase methodology provides a better dispersion of the metal sites onto the siliceous support than the dry-impregnation approach. The niobium-silica catalysts were then tested in the epoxidation of cyclohexene and 1-methylcyclohexene, as model substrates. (literal)
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