【摘要】 用沉淀沉积法和不同加料顺序制备了一系列草酸二乙酯气相加氢制乙二醇的Cu/SiO2催化剂,考察了反应温度、反应压力及氢气/草酸二乙酯摩尔比对催化性能的影响,以优化催化剂的制备方法和反应工艺条件.通过TPR,XRD,BET,HRTEM和SEM对催化剂进行了表征,揭示催化剂的稳定性、成型和活性位的分布.通过对实验数据的分析,确定了最佳的制备方法、铜负载量、还原温度和反应工艺条件,使草酸二乙酯的转化率和乙二醇的收率分别达到94.8%和76.0%.更多还原

【Abstract】 The Cu/SiO2 catalyst for gas-phase hydrogenation of diethyl oxalate(DEO) to ethylene glycol(EG) was prepared through the homogeneous deposition-precipitation method.The catalyst was evaluated at different reaction temperatures,pressures,and molar ratios of H2/DEO to optimize the catalyst preparation method and reaction conditions.Characterizations were carried out using various methods such as TPR,XRD,BET,HRTEM,and SEM to study the thermal stability of the catalyst,the catalyst forming,and the distribution of the active site.From the results of these experiments,the best preparation method,Cu loading,reduction temperature,and reaction conditions were obtained.Under the optimized conditions,the DEO conversion and EG yield reached 94.8% and 76.0%,respectively.更多还原