Dependence of copper species on the nature of the support for dispersed CuO catalysts (Articolo in rivista)

Type
Label
  • Dependence of copper species on the nature of the support for dispersed CuO catalysts (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp056604c (literal)
Alternative label
  • Gervasini A., Manzoli M., Martra G., Ponti A., Ravasio N., Sordelli L., Zaccheria F. (2006)
    Dependence of copper species on the nature of the support for dispersed CuO catalysts
    in The journal of physical chemistry. B
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gervasini A., Manzoli M., Martra G., Ponti A., Ravasio N., Sordelli L., Zaccheria F. (literal)
Pagina inizio
  • 7851 (literal)
Pagina fine
  • 7861 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 110 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Antonella Gervasini* Dipartimento di Chimica Fisica ed Elettrochimica & Centro di Eccellenza CIMAINA, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy Maela Manzoli and Gianmario Martra Dipartimento di Chimica I.F.M. & NIS Centre of Excellence, Università di Torino, via P. Giuria 7, I-10125 Torino, Italy, and UdR Torino 1 Interuniversity Consortium INCA Alessandro Ponti Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, via Golgi 19, I-20133 Milano, Italy, and UdR Milano Università, INSTM, via Giusti 9, 50121 Firenze, Italy Nicoletta Ravasio* and Laura Sordelli Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, via Golgi 19, I-20133 Milano, Italy Federica Zaccheria Dipartimento di Chimica Inorganica, Metallorganica e Analitica (CIMA), Università degli Studi di Milano, via Venezian 21, I-20133 Milano, Italy (literal)
Titolo
  • Dependence of copper species on the nature of the support for dispersed CuO catalysts (literal)
Abstract
  • Copper catalysts prepared by chemisorption-hydrolysis technique over silica (Cu/Si) and silica-alumina (Cu/SiAl) supports were studied to understand the role of the support on the nature and surface properties of the copper species stabilized on their surfaces. The morphological and surface properties of the copper phases have been characterized by complementary techniques, such as HRTEM, EXAFS-XANES, EPR, XPS, and FTIR. For the FTIR investigation, molecular probes (CO and NO) were also adsorbed on the surfaces to test the reactivity of the copper species. Moreover, the catalytic performances of the two catalysts have been compared in the HC-SCR reaction (NO reduction by C2H4) performed in highly oxidant conditions. The superior activity and selectivity of the supported silica-alumina catalyst with respect to that supported on silica could be related with the different nature of the copper species stabilized on the two supports, as emerged from the results obtained from the spectroscopic investigations. Small and well-dispersed CuO particles were present on silica, whereas isolated copper ions predominated on silica-alumina, likely in regions rich in alumina that made some exchangeable sites available, as indicated by FTIR spectra of adsorbed CO. The less positive global charge of copper species on Cu/SiAl than in Cu/Si has been confirmed by EPR, XPS, and EXAFS-XANES analyses. (literal)
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