Details

Autor(en) / Beteiligte

• Sato, A.G.
• Volanti, D.P.
• Meira, D.M.
• Damyanova, S.
• Longo, E.
• Bueno, J.M.C.

Titel

Effect of the ZrO2 phase on the structure and behavior of supported Cu catalysts for ethanol conversion

Ist Teil von

• Journal of catalysis, 2013-11, Vol.307, p.1-17

Ort / Verlag

Amsterdam: Elsevier Inc

Erscheinungsjahr

2013

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Effect of ZrO2 phases on the formation of acetaldehyde and ethyl acetate from ethanol over Cu/ZrO2 catalysts. [Display omitted] •Cu catalysts supported on am-, m-, and t-ZrO2 for selective ethanol conversion.•Cu/m-ZrO2 catalyst shows a high selectivity to ethyl acetate.•The high rate of ethyl acetate is defined by oxygen mobility from bulk ZrO2 to Cu.•A high rate for acetaldehyde formation is observed for Cu/t-ZrO2 catalyst. 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.