CO气相合成草酸二乙酯催化剂性能评价

EVALUATION OF CATALYST FOR DIETHYL OXALATE SYNTHESIS FROM CO IN GASEOUS PHASE

考察了Al2O3载体的类型和形状、活性组分Pd的负载量、活性组分Pd和助催化剂Fe之比对工业原料CO气相催化合成草酸二乙酯(DEO)反应的影响。结果表明,当Pd的负载量为1%～5%、Pd Fe为0.2～2.0(mol比)、条状α Al2O3为载体时,催化剂的性能优良,在此条件下,草酸二乙酯的最大收率可达60%,CO转化率可达63%,草酸二乙酯选择性可达98%。

The gaseous phase synthesis of diethyl oxalate and oxalic acid with CO was an important project of C1 chemical technology because CO source was abundant and its oxygen content was 57%. This process is a new green chemical technology. The catalysts for the titled reaction were prepared with impregnation method. The performance of Pd-Me/Al_2O_3 catalysts for the synthesis of diethyl oxalate from CO in gaseous phase were optimized and evaluated in a fixed-bed flow reactor with industrial feed gases that includes oxygen, H_2O, and sulfur. The influences of Pd loading, the molar ratio of Pd to promoter Fe and the type of Al_2O_3 supports on the performance of the catalysts were investigated. It was found that the performance of the catalyst was appropriate when the Pd loading was 1%～5%, Pd/Fe molar ratio was 0.2～2.0 and the supports were bar α-Al_2O_3 carriers. The yield of diethyl oxalate was more than 900g/L·h-1 with the conversion of CO over 63% and the selectivity to diethyl oxalate more than 95%, and the catalysts was stable.