Site-selective ethanol conversion over supported copper catalysts

The origin and influence of active sites on supported copper catalysts, and their catalytic properties for ethanol conversion, were investigated using Cu/SiO2, Cu2O/SiO2, and Cu/ZrO2. Diffuse reflectance infrared Fourier transform spectroscopy of adsorbed CO revealed that Cu1+ was more prevalent tha...

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Published inCatalysis communications Vol. 26; pp. 122 - 126
Main Authors Sato, André G., Volanti, Diogo P., de Freitas, Isabel C., Longo, Elson, Bueno, José Maria C.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.09.2012
Subjects
Copper catalysts
DRIFTS
Ethanol chemistry
Hydrogen
XANES
Zirconia polymorphs
Copper catalysts
Ethanol chemistry
DRIFTS
XANES
Hydrogen
Zirconia polymorphs
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Summary:The origin and influence of active sites on supported copper catalysts, and their catalytic properties for ethanol conversion, were investigated using Cu/SiO2, Cu2O/SiO2, and Cu/ZrO2. Diffuse reflectance infrared Fourier transform spectroscopy of adsorbed CO revealed that Cu1+ was more prevalent than Cu0 species at the Cu/SiO2 surface, and that Cu0 was the main species on Cu/ZrO2. The Cu1+/Cu0 pair provided by Cu/SiO2 generates sites that are highly selective for the dehydrogenation of ethanol. Ethyl acetate can be formed from ethanol and acetaldehyde at ZrO2 or Cu surfaces. A combination of the Cu1+/Cu0 pair and Cu0 interfaced to ZrO2 is needed to efficiently transform ethanol to ethyl acetate. [Display omitted] ► Different than for Cu/ZrO2, over Cu/SiO2, Cu1+ was prevalent over Cu0 species. ► Cu1+/Cu0 and Cu0 interfaced to ZrO2 are needed to higher selectivity to ethyl acetate. ► Cu1+/Cu0 pair provided by Cu/SiO2 generates sites highly selective to acetaldehyde.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2012.05.008