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- Effect of the ZrO2 phase on the structure and behavior of supported Cu catalysts for ethanol conversion
- Universidade Federal de São Carlos (UFSCar)
- Universidade Estadual Paulista (UNESP)
- Bulgarian Academy of Sciences
- The effect of amorphous (am-), monoclinic (m-), and tetragonal (t-) ZrO2 phase on the physicochemical and catalytic properties of supported Cu catalysts for ethanol conversion was studied. The electronic parameters of Cu/ZrO2 were determined by in situ XAS, and the surface properties of Cu/ZrO2 were defined by XPS and DRIFTS of CO-adsorbed. The results demonstrated that the kind of ZrO2 phase plays a key role in the determination of structure and catalytic properties of Cu/ZrO 2 catalysts predetermined by the interface at Cu/ZrO2. The electron transfer between support and Cu surface, caused by the oxygen vacancies at m-ZrO2 and am-ZrO2, is responsible for the active sites for acetaldehyde and ethyl acetate formation. The highest selectivity to ethyl acetate for Cu/m-ZrO2 catalyst up to 513 K was caused by the optimal ratio of Cu0/Cu+ species and the high density of basic sites (O2-) associated with the oxygen mobility from the bulk m-ZrO2. © 2013 Elsevier Inc. All rights reserved.
- Journal of Catalysis, v. 307, p. 1-17.
- Cu/ZrO2 catalysts
- Ethanol dehydrogenation
- Ethyl acetate
- Catalytic properties
- Electron transfer
- Electronic parameters
- Ethanol conversion
- Ethyl acetates
- Oxygen mobility
- Supported Cu
- Catalyst selectivity
- Zirconium alloys
- Catalyst supports
- Acesso restrito
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