Transformation of ethanol to ethyl acetate over Cu/SiO₂ catalysts modified by ZrO₂

Abstract

Direct transformation of ethanol to ethyl acetate was investigated on a series of Cu(ZrO₂)/SiO₂ catalysts. Inductively coupled plasma(ICP), surface area analysis, X-ray diffraction(XRD), H₂-temperature programmed reduction(H₂-TPR), X-ray photoelectron spectroscopy(XPS), NH₃-temperature programmed desorption(NH3-TPD) and Fourier transform-infrared spectroscopy(FTIR) techniques were used to characterize the catalysts. The results reveal that ZrO₂ can improve the dispersion of copper species and increase the acidity of the Cu(ZrO₂)/SiO₂ catalysts. The Cu₀ is responsible for ethanol dehydrogenation to acetaldehyde, and both the Lewis acid and Brønsted acid sites were in favor of the selectivity to ethyl acetate. The synergistic effect of Cu₀ and an appropriate amount of acidic sites played an important role in the production of ethyl acetate.

Keywords

Ethyl acetate / Ethanol / Zirconium / Copper based catalyst / Acid site

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