We used the Electron Paramagnetic Resonance (EPR) technique to study the interaction of SO2 molecules on bare and partially hydroxylated Alkali-Earth Oxides surface (AEOs). When SO2 is adsorbed on the surfaces of higher basicity (CaO and SrO) disproportionation reaction occurs with formation of SO2•- radical. We show also that, when the same reaction is present on partially hydroxylated surfaces a fraction of the electrons exchanged during the redox process are trapped on the oxides surface forming colour centres ((H+)(e-) centres).

EPR study of electron trapping on partially hydroxylated alkali-earth oxides occurring during SO2 disproportionation.

LIVRAGHI, Stefano;PAGANINI, Maria Cristina;GIAMELLO, Elio
2011

Abstract

We used the Electron Paramagnetic Resonance (EPR) technique to study the interaction of SO2 molecules on bare and partially hydroxylated Alkali-Earth Oxides surface (AEOs). When SO2 is adsorbed on the surfaces of higher basicity (CaO and SrO) disproportionation reaction occurs with formation of SO2•- radical. We show also that, when the same reaction is present on partially hydroxylated surfaces a fraction of the electrons exchanged during the redox process are trapped on the oxides surface forming colour centres ((H+)(e-) centres).
349
100
104
SO2; EPR; Alkaly Earth Oxides; Surface; Catalysis; Disproportionation
Stefano Livraghi; Maria Cristina Paganini*; Elio Giamello
File in questo prodotto:
File Dimensione Formato  
2011_JMolCat-A.pdf

Accesso riservato

Tipo di file: MATERIALE NON BIBLIOGRAFICO
Dimensione 353.83 kB
Formato Adobe PDF
353.83 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
2011-SO2.pdf

Accesso aperto con embargo fino al 31/10/2013

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 219.6 kB
Formato Adobe PDF
219.6 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/88951
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact