Highly active Cu/SiO₂ catalysts for hydrogenation of diethyl malonate to 1,3-propanediol

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• 作者：Tongmei Ding ; Hengshui Tian ; ^{hstian@ecust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jichang Liu ; Wenbin Wu ; Jintao Yu
• 关键词：Copper ; Silica ; Diethyl malonate ; Hydrogenation ; 1 ; 3-Propanediol ; Calcination temperature
• 刊名：Chinese Journal of Catalysis
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：37
• 期：4
• 页码：484-493
• 全文大小：2904 K

文摘

Cu/SiO₂ catalysts prepared by the ammonia evaporation method were applied to hydrogenation of diethyl malonate to 1,3-propanediol. The calcination temperature played an important role in the structural evolution and catalytic performance of the Cu/SiO₂ catalysts, which were systematically characterized by N₂ adsorption-desorption, inductively coupled plasma-atomic emission spectroscopy, N₂O chemisorption, X-ray diffraction, Fourier transform infrared spectroscopy, H₂ temperature-programmed reduction, transmission electron microscopy, and X-ray photoelectron spectroscopy. When the Cu/SiO₂ catalyst was calcined at 723 K, 90.7% conversion of diethyl malonate and 32.3% selectivity of 1,3-propanediol were achieved. Compared with Cu/SiO₂ catalysts calcined at other temperatures, the enhanced catalytic performance of the Cu/SiO₂ catalyst calcined at 723 K can be attributed to better dispersion of copper species, larger cupreous surface area and greater amount of copper phyllosilicate, which results in a higher ratio of Cu⁺/Cu⁰. The synergetic effect of Cu⁰ and Cu⁺ is suggested to be responsible for the optimum activity.