MgO/NaY催化甲醇与碳酸乙烯酯酯交换合成碳酸二甲酯

以硝酸镁为前体，通过等体积浸渍法制备不同负载量的MgO/NaY催化剂，用CO2-TPD和TEM对催化剂进行了表征，考察MgO负载量、反应温度、反应时间等条件对甲醇与碳酸乙烯酯（EC）酯交换反应合成对碳酸二甲酯（DMC）的影响。实验结果表明：MgO的负载量对催化剂表面的碱量和MgO分散程度有着重要影响。高分散的MgO物种越多，其催化剂碱量越高。采用12%MgO/NaY为催化剂、反应温度70 ℃、n(甲醇)∶n(EC)= 8∶1、反应时间3 h时，EC的转化率和DMC的选择性最佳，DMC收率高达89%。

Efficient synthesis of dimethyl carbonate via the transesterification of ethylene carbonate with methanol over MgO/NaY catalyst

MgO/NaY catalysts prepared via wet impregnation method have been investigated for the catalytic synthesis of dimethyl carbonate(DMC)by the methanol with ethylene carbonate(EC).Several techniques,including CO2-TPD,TEM,were applied to characterize the structure and basic properties of the as-synthesized catalysts.The effects of MgO loading amount,reaction temperature,reaction time,and the ratio of methanol to EC on the catalytic performance have been studied.The results demonstrated that the MgO-loading amount played an important role on the dispersion of MgO species and the basic property of catalysts.The best catalytic performance was obtained over the 12% MgO/NaY catalyst under 70 °C with a ratio of methanol to EC of 8∶1,affording a remarkable DMC yield of 89%.