焙烧温度对草酸二甲酯加氢制乙二醇Cu/SiO_2催化剂性能的影响  

Effect of calcination temperature on Cu/SiO_2 catalyst for hydrogenation of dimethyl oxalate to ethylene glycol

作　　者：张雅静[1] 赵鑫[1] 李朋辉[1] 郑娜[1] 吴静[1] 

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《天然气化工—C1化学与化工》2014年第5期31-34,共4页Natural Gas Chemical Industry

基　　金：沈阳市科技局项目(NoF11-264-1-76);辽宁省教育厅项目(L2011065)

摘　　要：以氨水(w=28%)作为沉淀剂,十六烷基三甲基溴化铵(CTAB)为改性剂,采用沉淀沉积法(蒸氨法)制备了Cu/SiO2催化剂,采用BET、XRD、H2-TPR等对催化剂结构进行表征,考察了焙烧温度对催化剂草酸二甲酯加氢制备乙二醇反应性能的影响。结果表明焙烧温度影响催化剂晶体结构、孔结构和活性组分的还原性能,从而影响了Cu/SiO2催化剂对草酸二甲酯加氢制备乙二醇的催化性能。当焙烧温度为400℃时催化剂表现出较好的催化性能。在固定床反应器中,当反应温度为200℃,反应压力为2.1MPa,n(H2)/n(DMO)为90,LHSV为0.8h-1,草酸二甲酯的转化率达到100%,乙二醇的选择性为97.3%。Cu/SiO2 catalysts were prepared using aqueous ammonia （w（NH3）=28%） as precipitant and cetyl trimethyl ammonium bromide （CTAB） as modifier by one of deposition-precipitation techniques--the ammonia evaporation method. The effect of calcination temperature on the performances of catalysts for hydrogenation of dimethyl oxalate to ethylene glycol was investigated by means of XRD, BET and H2-TPR. The results showed that calcination temperature affected the crystal structure, pore structure and active component reducibility of the catalysts, thus influenced the catalytic performances of the catalysts on hydrogenation of dimethyl oxalate （DMO） to ethylene glycol （EG）. The catalyst calcined at 400℃ showed the best catalytic performance, and DMO hydrogenation over this catalyst in the fixed-bed reactor under the reaction conditions of 200℃, 2.1MPa , n （H2）：n （DMO）=90 and LHSV=0.8h-1 gave 100% DMO conversion and 97.3% EG selectivity.

关 键 词：草酸二甲酯 加氢 乙二醇 CU/SIO2 催化剂制备 焙烧温度 

分 类 号：TQ426[化学工程] O643[理学—物理化学]