Pd(PPh_3)_2Cl_2-CuCl_2/AC催化乙醇氧化羰化合成碳酸二乙酯

Study on the catalytic synthesis of diethyl carbonate via vapor phase oxidative carbonylation of ethanol

采用浸渍法制备了乙醇直接气相氧化羰化合成碳酸二乙酯的负载型催化剂,并在连续流动固定床反应装置上评价了催化剂的反应活性,考察了催化剂活性组分、载体、活性组分负载量等因素对催化反应活性的影响。结果表明,活性炭是较好的载体,CuC l2是较好的铜盐前驱体,添加了Pd(PPh3)2C l2的CuC l2/AC催化剂活性更高。当Cu负载量为9.0%,Pd负载量为0.5%时,催化剂的活性较好。在优化的催化剂制备条件下,乙醇的转化率超过30%,碳酸二乙酯(DEC)的选择性达到95%。

Diethyl carbonate （DEC） synthesis reaction by oxidative carbonylation of ethanol has been studied using vapor phase flow reaction system in the presence of Cu-based catalyst prepared by the conventional impregnation method. The effect of various preparation parameters on the catalytic activities were intensively evaluated in terms of ethanol conversion and DEC selectivity. The results show that activated carbon and CuCl2 are better support and precursor respectively and their catalytic activity was improved when Pd（ PPh3 ）2Cl2 was applied as the promoter. The catalyst had better activity when Cu and Pd loading are 9.0% and 0.5% respectively. The conversion of ethanol was over 30% and DEC selectivity was 95 % under optimum preparation condition and the catalysts retained better catalytic activity in 100 h continues reaction.