常温常压下分别在离子液体 1-丁基-3-甲基咪唑四氟硼酸盐([bmim]BF4)-MeCN混合溶剂和纯MeCN溶剂中研究了CO2在Cu电极上的循环伏安行为. 结果表明, CO2均发生不可逆还原反应生成CO-2. 与纯MeCN溶剂相比,在混合溶剂中CO2还原峰电位均有正移. 这表明溶剂中的咪唑型离子液体对活化CO2有催化作用. 在混合溶剂中,以CO2和MeOH为原料合成碳酸二甲酯(DMC), 考察了[bmim]BF4/MeCN体积比、工作电极材料、 MeOH浓度和电解电位等对DMC产物收率的影响. 与其他DMC合成方法相比,本法反应条件温和、设备简单、合成产物收率较高. 在优化的条件下, DMC产物收率可达79.6%. 并提出了合成DMC可能的反应机理.
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