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首页> 外文期刊>Catalysis Communications >Highly active and selective Cu/SiO2 catalysts prepared by the urea hydrolysis method in dimethyl oxalate hydrogenation
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Highly active and selective Cu/SiO2 catalysts prepared by the urea hydrolysis method in dimethyl oxalate hydrogenation

机译：草酸二甲酯加氢中尿素水解法制备的高活性和高选择性Cu / SiO2催化剂

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摘要

Cu/SiO2 catalysts have been successfully prepared via urea hydrolysis method. The catalysts have been systematically characterized by X-ray diffraction, high-resolution transmission electron microscopy, N2-physisorption and H2 temperature-programmed reduction. The results demonstrated the presence of copper nanoparticles and their high dispersion on the SiO2 support. Catalysts with different copper loadings were prepared, and their performances in the hydrogenation of dimethyl oxalate to ethylene glycol were studied. A 100% conversion of dimethyl oxalate and maximum 98% selectivity of ethylene glycol were reached with 15.6 wt.% copper loading at 200 °C and 2 MPa. Furthermore, under the same reaction conditions, the catalyst can maintain the selectivity of 90% when the reduction temperature reduced from 350 °C to 200 °C. The high activity and selectivity over the catalyst may be ascribed to the homogenously distribution of copper nanoparticles on the large surface.
机译：通过尿素水解法已经成功地制备了Cu / SiO 2催化剂。通过X射线衍射，高分辨率透射电子显微镜，N2物理吸附和H2程序升温还原对催化剂进行了系统表征。结果表明铜纳米颗粒的存在及其在SiO2载体上的高分散性。制备了不同载铜量的催化剂，研究了草酸二甲酯加氢制乙二醇的性能。在200°C和2 MPa下，铜负载量为15.6 wt％时，草酸二甲酯的转化率为100％，乙二醇的最大选择性为98％。此外，在相同的反应条件下，当还原温度从350℃降低至200℃时，催化剂可以保持90％的选择性。催化剂上的高活性和选择性可以归因于铜纳米颗粒在大表面上的均匀分布。

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