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Effect of the ZrO₂ phase on the structure and behavior of supported Cu catalysts for ethanol conversion
- Sato, A.G., Volanti, D.P., Meira, D.M., Damyanova, S., Longo, E., Bueno, J.M.C.
- Journal of catalysis 2013 v.307 pp. 1-17
- X-ray photoelectron spectroscopy, acetaldehyde, active sites, catalysts, copper, electron transfer, ethanol, ethyl acetate, oxygen
- 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/ZrO₂ 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 513K 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.