Effect of leaching temperature on structure and performance of Raney Cu catalysts for hydrogenation of dimethyl oxalate
Effect of leaching temperature on structure and performance of Raney Cu catalysts for hydrogenation of dimethyl oxalate
复制标题
浸出温度对草酸二甲酯加氢雷尼铜催化剂结构和性能的影响
DOI：
10.1016/j.apcata.2015.10.029
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发表时间：
2016-01-05
影响因子：
5.5
通讯作者：
Liu, Kefeng
中科院分区：
文献类型：
--
作者：
Kong, Xiangpeng;Ma, Cailian;Liu, Kefeng
在催化剂制备过程中，系统地研究了通过在氢氧化钠溶液中选择性浸出Cu-Al（50wt%Cu-50wt%Al）合金颗粒合成的Raney Cu催化剂。结果表明，Raney Cu催化剂的微观结构，物理化学和表面性质深刻地依赖于浸出温度。在草酸二甲酯（DMO）气相加氢反应中，在温和的浸取条件下制备的Raney Cu催化剂容易失活，生成乙醇酸甲酯（MG）。在较高的浸取温度下制备的催化剂具有良好的稳定性，有利于乙二醇的合成。特别地，在40 ℃下获得的Raney Cu催化剂在DMO加氢中显示出优异的上级稳定性和95.0%的MG选择性。此外，还对Raney Cu催化剂在DMO加氢反应中失活的原因进行了详细的讨论。(C)2015 Elsevier B. V.版权所有。
As-synthesized Raney Cu catalysts through selective leaching of Cu-Al (50 wt%Cu-50 wt%Al) alloy pellets in sodium hydroxide solution have been systematically investigated during the catalyst preparation process. Results reveal that the microstructures, physicochemical and surface properties of the Raney Cu catalysts depend profoundly on the leaching temperature. In gas-phase hydrogenation of dimethyl oxalate (DMO), the Raney Cu catalysts prepared at the mild leaching conditions tend to deactivate rapidly, the formation of methyl glycolate (MG). As-prepared catalysts at higher leaching temperature exhibit excellent stability, favoring the synthesis of ethylene glycol (EG). Especially, Raney Cu catalyst obtained at 40 degrees C shows the superior stability and MG selectivity of 95.0% in DMO hydrogenation. Furthermore, the reasons for deactivation of Raney Cu catalyst in DMO hydrogenation have been discussed in detail. (C) 2015 Elsevier B.V. All rights reserved.