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MgO/NaY催化甲醇与碳酸乙烯酯酯交换合成碳酸二甲酯

倪 蓓,许 杰,薛 冰,刘 平,李永昕   

  1. 常州大学石油化工学院,江苏 常州 213164
  • 出版日期:2012-05-05 发布日期:2012-05-05

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

NI Bei,XU Jie,XUE Bing,LIU Ping,LI Yongxin   

  1. Institute of Petrochemical Technology,Changzhou University,Changzhou 213164,Jiangsu,China
  • Online:2012-05-05 Published:2012-05-05

摘要: 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%。

关键词: 氧化镁, 甲醇, 碳酸乙烯酯, 碳酸二甲酯

Abstract: 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%.

Key words: MgO, methanol, ethylene carbonate, dimethyl carbonate

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