铜含量对草酸二甲酯加氢制乙二醇Cu/SiO2催化剂性能的影响  

Effect of copper content on the performance of Cu/SiO_2 catalyst for dimethyl oxalate hydrogenation to ethylene glycol

作　　者：马俊国[1,2] 葛庆杰[1] 徐恒泳[1] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《天然气化工—C1化学与化工》2016年第6期10-14,36,共6页Natural Gas Chemical Industry

基　　金：国家自然科学基金(批准号:21403215)

摘　　要：采用蒸氨沉淀法制备了不同铜含量的系列Cu/SiO_2催化剂,并利用H_2-TPR、N_2O化学吸附、BET、XRD,FT-IR等手段进行了表征,研究了铜含量对Cu/SiO_2催化剂催化草酸二甲酯加氢制乙二醇的反应性能的影响。结果表明,活性金属铜的高效分散,对催化剂性能具有较大影响,过量的铜会覆盖于催化剂表面,造成铜的活性比表面积下降,降低催化剂的加氢性能。对于所考察SiO_2载体,其可以有效分散高达40%的活性金属铜,而较高铜含量的催化剂具有较优的加氢活性,尤其是具有较优的低温加氢活性。催化剂C-40-Cu在180℃时,可达到几乎100%的DMO转化率和大于97%的乙二醇选择性。Several Cu/SiO2 catalysts with different copper content were prepared by ammonia evaporation method, and characterized by H2-TPR, N2O chemisorption, BET, XRD and FT-IR. The effect of copper content on the catalytic performances of the catalysts for DMO hydrogenation to EG was investigated. The results show that efficient dispersion of the active metal copper has a greater effect on the catalyst performance. Excessive copper will cover the surface of the catalyst causing the decline of active surface area of copper and hydrogenation activity of the catalyst. When copper is below 40% by mass in the catalyst, it could be well dispersed on the support, and the hydrogenation activity of catalyst, especially low temperature activity, increases with copper content. At 180℃, the conversion of DMO was 100% with a EG selectivity of above 97% over the catalyst C-40-Cu.

关 键 词：草酸二甲酯加氢 乙二醇 Cu/Si O2 铜含量 

分 类 号：TQ426.8[化学工程] TQ223.162