氧化石墨烯负载吡啶基碱性离子液体催化合成碳酸二甲酯的研究  

Dimethyl carbonate synthesis catalyzed by graphene oxide immobilized basic pyridinium ionic liquid

作　　者：高敏[1] 万梓宇 张卫红[1] 管琪雯 杜晨辉 GAO Min;WAN Zi-yu;ZHANG Wei-hong;GUAN Qi-wen;DU Chen-hui(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《现代化工》2021年第10期118-122,共5页Modern Chemical Industry

基　　金：江苏省先进催化与绿色制造协同创新中心创新型人才支持项目(ACGM2018-03-16)。

摘　　要：以氧化石墨烯(GO)为载体,采用缩合与阴离子交换2步反应制备负载吡啶基碱性离子液体催化剂GO-[SPy]OH。通过FT-IR、TGA、XPS等手段对催化剂组成和结构进行表征,并考察了催化剂质量、醇酯摩尔比、反应时间、反应温度等工艺参数对酯交换合成碳酸二甲酯(DMC)反应的影响。结果表明,在催化剂质量为0.05 g、反应温度为90℃、甲醇/碳酸乙烯酯摩尔比为12∶1、反应时间为3 h的优化条件下,DMC的收率达到92%,选择性为100%。催化剂重复使用4次后仍能保持良好的催化活性。Graphene oxide immobilized pyridinium-type basic ionic liquid( GO-[SPy]OH) catalyst is fabricated by using a two-step strategy,i. e.,a condensation and an anion-exchanging reaction. The composition and structure of the catalyst are determined by employing FT-IR,TGA and XPS.The catalytic performance of GO-[SPy]OH is evaluated in the transesterification of ethylene carbonate( EC) with MeOH to form dimethyl carbonate( DMC).Influences of reaction conditions including reaction time,reaction temperature,the molar ratio of MeOH to EC and the catalyst dosage on the transesterification reaction are investigated.It is found that the yield and selectivity of DMC can reach 92% and 100%,respectively under the optimum reaction conditions that the usage of the catalyst is 0. 05 g,reactive temperature is at90℃,the molar ratio of MeOH to EC is 12 ∶ 1 and the reaction lasts for 3 h. The catalyst can maintain a good catalytic activity after it has been used for 4 times repeatedly.

关 键 词：碳酸二甲酯 酯交换 氧化石墨烯 碱性离子液体 

分 类 号：TQ225[化学工程—有机化工]