Structure–reactivity relationship in Co3O4 promoted Au/CeO2 catalysts for the CH3OH oxidation reaction revealed by in situ FTIR and operando EXAFS studies. Issue 5 (11th January 2017)

• Record Type: Journal Article
• Authors: Manzoli, M.; Vindigni, F.; Tabakova, T.; Lamberti, C.; Dimitrov, D.; Ivanov, K.; Agostini, G.
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 5(2017)
• Page Start: 2083
• Page End: 2094
• Publication Date: 2017-01-11
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta06442f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A strong influence of the amount of the Co3 O4 promoter on the catalytic performance in methanol oxidation of different gold catalysts supported on ceria was observed. Abstract : A strong influence of the amount of the Co3 O4 promoter on the catalytic performance in methanol oxidation of different gold catalysts supported on ceria was observed. The activity followed the order: Au/10 wt% Co3 O4 -doped CeO2 > Au/5 wt% Co3 O4 -doped CeO2 > Au/15 wt% Co3 O4 -doped CeO2 > Au/CeO2 ≫ Au/Co3 O4 . FTIR measurements of adsorbed CO indicate that oxidized gold sites are initially present on the activated samples and that such species are involved in the methanol reaction. Methanol oxidation performed under static conditions gave rise at 75 °C to mainly formate species on Au/CeO2 and to a large variety of different carbonate species on Au/10 wt% Co3 O4 -doped CeO2 . FTIR and EXAFS analyses revealed that the active sites present on the best performing Au/CeO2 catalyst added with 10 wt% Co3 O4 are oxidized gold species, close to Co sites, at the interface with the support, which are reduced under reaction conditions. These species are able to activate and to react with oxygen giving rise to formate and carbonate species.