Zn、A1改性Cu／SiO2催化剂及其对草酸二甲酯加氢合成乙二醇催化性能的影响

采用溶胶凝胶法制备Cu／Si02催化剂．考察助剂Zn、A1对Cu／SiO2催化剂在草酸二甲酯（DMO）加氢合成乙二醇（EG）催化反应中催化性能及其稳定性的影响，并采用TPR、BET、XRD等方法表征催化剂结构．结果表明：加入助剂zn后，Cu／SiO2催化剂的催化活性有所提高，在反应温度205℃、压力常压、氢酯摩尔比80、液时空速0．4h-1条件下，草酸二甲酯加氢制乙二醇的收率达到97％；加入助剂A1后，在同样的反应条件下，Cu／SiO2催化剂的催化活性有所降低，乙二醇的收率为90％左右．在催化剂中加入助剂zn、A1后，催化剂的稳定性均有所下降，在反应3h后，DMO的转化率开始逐渐降低．

Effect of Promoter Zn,AI on Cu/SiO2 Catalysts for Synthesis of Ethylene Glycol from Dimethyl Oxalate Hydrogenation

The influences of Zn, AI promoters on the catalytic performance of Cu/SiO2 catalyst in the ethylene glycol synthesis from dimethyl oxalate （DMO） hydrogenation were studied. Cu/SiO2 catalysts were prepared by sol-gel method, and Zn and AI were loaded by additive of nitrate. The catalytic performances of the prepared catalysts were investigated under conditions of 205 ℃, the pressure is 0. 1 MPa, n（H2）：n（DMO） = 80,LHSV = 0.4 h-1. The experimental results showed that Zn promoted catalysts showed a higher performance than Cu/SiO2, with EG yield of 97 %, and A1 promoted catalysts showed a lower performance with EG yield of 90 %. Characterizations of XRD, H2-TPR, BET revealed the catalytic performance was affected by the structure of the catalyst.