title: Gold stabilized aqueous sols immobilized on mesoporous CeO2-Al2O3 as catalysts for the preferential oxidation of carbon monoxide.
abstract: Nanostructured Au/Al(2)O(3)-CeO(2) catalysts with a low content of precious metal (0.9% wt.) were prepared immobilizing two different stabilized Au sols on a high surface area Al(2)O(3)-CeO(2) mixed oxide with a uniform pore size distribution, synthesized by a one-pot methodology. The samples were characterized by elemental analysis, N(2) physisorption, XRPD, TEM and (27)Al-MAS NMR techniques. The catalytic activity of the two samples in the preferential oxidation of CO in excess of H(2) (CO-PROX) was comparatively evaluated in the 35-110 degrees 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.
authors.affiliation: Department of Chemistry, University Ca' Foscari of Venice, Via Torino 155/B, 30172 Venice, Italy. storaro@unive.it
authors.forename: Loretta
authors.initials: L
authors.lastname: Storaro
authors.forename: Maurizio
authors.initials: M
authors.lastname: Lenarda
authors.forename: Elisa
authors.initials: E
authors.lastname: Moretti
authors.forename: Aldo
authors.initials: A
authors.lastname: Talon
authors.forename: Francesca
authors.initials: F
authors.lastname: Porta
authors.forename: Bernardo
authors.initials: B
authors.lastname: Moltrasio
authors.forename: Patrizia
authors.initials: P
authors.lastname: Canton