Spectroscopic enlightening the local structure of VOx active sites in catalysts for the odh of propane (Articolo in rivista)

Type
Label
  • Spectroscopic enlightening the local structure of VOx active sites in catalysts for the odh of propane (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp307031b (literal)
Alternative label
  • Ilenia Rossetti, Giulia Fulvia Mancini, Paolo Ghigna, Marco Scavini, Marco Piumetti, Barbara Bonelli, Fabrizio Cavani, Antonio Comite (2012)
    Spectroscopic enlightening the local structure of VOx active sites in catalysts for the odh of propane
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ilenia Rossetti, Giulia Fulvia Mancini, Paolo Ghigna, Marco Scavini, Marco Piumetti, Barbara Bonelli, Fabrizio Cavani, Antonio Comite (literal)
Pagina inizio
  • 22386 (literal)
Pagina fine
  • 22398 (literal)
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  • 116 (literal)
Rivista
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  • 13 (literal)
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  • +Dipartimento Chimica, Universita? degli Studi di Milano, CNR-ISTM and INSTM Unit Milano-Universita?, v. C. Golgi 19, 20133 Milano, Italy §Dipartimento Chimica, Universita degli Studi di Pavia and INSTM Unit Pavia, V.le Taramelli 13, I-27100, Pavia, Italy ?Dipartimento Scienza Applicata e Tecnologia, Politecnico di Torino and INSTM unit of Torino-Politecnico, Corso Duca degli Abruzzi 24, I-10129 Turin, Italy ?Dipartimento Chimica Industriale e dei Materiali, Viale Risorgimento 4, 40136 Bologna, Italy #Dipartimento Chimica e Chimica Industriale, Universita? degli Studi di Genova, via Dodecaneso 31, 16146 Genova, Italy (literal)
Titolo
  • Spectroscopic enlightening the local structure of VOx active sites in catalysts for the odh of propane (literal)
Abstract
  • Site isolation of V active sites has been often correlated to catalytic performance for the oxidative dehydrogenation (ODH) of propane to propylene. In particular, catalyst selectivity seems favored by high V dispersion. The latter property is hardly attainable by traditional preparation methods, especially by impregnation except at very low V loading, which however may lead to a too high surface exposure of the acidic sites of the support. In this paper, the effect of the preparation procedure on catalyst properties has been investigated, particularly considering catalysts prepared by flame pyrolysis, a synthesis method which induced a very high V dispersion also at relatively high vanadium loading. Transmission electron microscopy also allowed us to assess V oxide dispersion depending on both the support type and the preparation method. Furthermore, the local structure of the V active sites has been deeply investigated by X-ray absorption spectroscopy, allowing us to propose a possible structure of the active sites. The average oxidation state of surface V species was then studied by X-ray photoelectron spectroscopy (XPS), showing a role of V oxidation state on catalyst selectivity. The catalytic performance has been interpreted on the basis of V species and catalyst acidity (as measured by IR spectroscopy), another fundamental parameter that in turn results to be correlated with V dispersion on different supports. More selective catalysts were indeed characterized by the presence of weaker Brønsted acidic sites. (literal)
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