Investigation on Process Mechanism on Cu–Cr Catalysts for Ethanol Dehydrogenation to Ethyl Acetate

Author: Zhang Minhua   Li Guiming   Jiang Haoxi   Zhang Jiyan  

Publisher: Springer Publishing Company

ISSN: 1011-372X

Source: Catalysis Letters, Vol.141, Iss.8, 2011-08, pp. : 1104-1110

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Abstract

The Cu–Cr catalysts were prepared by co-precipitation method,and the role of active sites on Cu–Cr catalyst for direct synthesis of ethyl acetate from ethanol was investigated. The catalysts were characterized by means of XRD, TEM, XPS, ethanol-TPSR, EA-TPD and FT-IR etc., respectively. The results show that the outermost surface layer of Cu–Cr catalysts after reduction is composed of Cu0, Cr2O3 and CuCr2O4 phases. The ethanol dehydrogenation step is carried out on Cu0 active sites, but the selectivity of ethyl acetate is not remarkably influenced by the properties of Cu0 active sites, the proper performances of Lewis acidic sites on the Cu–Cr catalyst might play a key role to improve the selectivity of ethyl acetate.