Articles written in Journal of Chemical Sciences
Volume 126 Issue 4 July 2014 pp 1013-1020
The direct transformation of ethanol to ethyl acetate over Cu/SiO2 catalysts that contain copper phyllosilicate
Xue Yu Shubo Zhai Wanchun Zhu Shuang Gao Jianbiao Yan Hongjing Yuan Lili Chen Jiahuan Luo Wenxiang Zhang Zhenlu Wang
Cu/SiO2 catalysts that contain copper phyllosilicate, were successfully prepared using the ammonia-evaporation method. The catalysts were characterized via XRD, ICP, BET, FTIR, TPR, XPS, NH3-TPD and FTIR of Pyridine Adsorption techniques. The results demonstrated that the formation of the copper phyllosilicate species significantly affected the structural properties and caused the CuO nanoparticles to become highly dispersed, and the copper phyllosilicate would provide access to the Lewis acidic Cu+ species. It was found that the catalyst with a 23.7 wt% copper loading exhibited the best ethanol conversion and ethyl acetate selectivity. When compared to a catalyst with the same copper loading which was prepared with the impregnation method, the higher activity and selectivity of catalysts might be ascribed to the homogenous distribution of copper nanoparticles, which was the active site for the dehydrogenation, and the amount of Lewis acidic Cu+ sites active for esterification. The synergetic effect between the Cu0 and Lewis acidic sites was the key factor to achieve direct transformation of ethanol to ethyl acetate.
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