Site-selective ethanol conversion over supported copper catalysts
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Data
2012-09-05
Autores
Sato, Andre G.
Volanti, Diogo P. [UNESP]
de Freitas, Isabel C.
Longo, Elson [UNESP]
Bueno, Jose Maria C.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
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 Cu-0 species at the Cu/SiO2 surface, and that Cu-0 was the main species on Cu/ZrO2. The Cu1+/Cu-0 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+/Cu-0 pair and Cu-0 interfaced to ZrO2 is needed to efficiently transform ethanol to ethyl acetate. (C) 2012 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
DRIFTS, XANES, Zirconia polymorphs, Hydrogen, Copper catalysts, Ethanol chemistry
Como citar
Catalysis Communications. Amsterdam: Elsevier B.V., v. 26, p. 122-126, 2012.