Nanostructured Au/Al2O3-CeO2 catalysts with a low content of precious metal (0.9%wt.) were prepared immobilizing two different stabilized Au sols on a high surface area Al2O3-CeO2 mixed oxide with a uniform pore size distribution, synthesized by a one-pot methodology. The samples were characterized by elemental analysis, N2 physisorption, XRPD, TEM and 27Al-MAS NMR techniques. The catalytic activity of the two samples in the preferential oxidation of CO in excess of H2 (CO-PROX) was comparatively evaluated in the 35-110°C temperature range. The Au-THPS/AlCe20 sample, prepared immobilizing a sol obtained reducing an aqueous solution of gold tetrachloroaurate salt with bis[tetrakis(hydroxymethyl)phosphonium sulfate], resulted very active and selective at low temperatures and its catalytic activity was correlated with the structural characteristics of the metal particles and of the ordered mesoporous support.

Gold stabilized aqueous sols immobilized on mesoporous CeO2-Al2O3 as catalysts for the preferential oxidation of carbon monoxide

STORARO, Loretta;MORETTI, Elisa;TALON, Aldo;CANTON, Patrizia;LENARDA, Maurizio
2010-01-01

Abstract

Nanostructured Au/Al2O3-CeO2 catalysts with a low content of precious metal (0.9%wt.) were prepared immobilizing two different stabilized Au sols on a high surface area Al2O3-CeO2 mixed oxide with a uniform pore size distribution, synthesized by a one-pot methodology. The samples were characterized by elemental analysis, N2 physisorption, XRPD, TEM and 27Al-MAS NMR techniques. The catalytic activity of the two samples in the preferential oxidation of CO in excess of H2 (CO-PROX) was comparatively evaluated in the 35-110°C temperature range. The Au-THPS/AlCe20 sample, prepared immobilizing a sol obtained reducing an aqueous solution of gold tetrachloroaurate salt with bis[tetrakis(hydroxymethyl)phosphonium sulfate], resulted very active and selective at low temperatures and its catalytic activity was correlated with the structural characteristics of the metal particles and of the ordered mesoporous support.
File in questo prodotto:
File Dimensione Formato  
63storaro10.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: Accesso chiuso-personale
Dimensione 907.11 kB
Formato Adobe PDF
907.11 kB Adobe PDF   Visualizza/Apri

I documenti in ARCA 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: https://hdl.handle.net/10278/30197
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 14
social impact