摘要
通过烷基化反应和简单的一锅法将醇胺离子液体(TEA)嫁接到氯甲基聚苯乙烯(PS-Cl)微球上,将形成的嫁接型离子液体催化剂(PS-[TEA]I)用于催化CO2和环氧化物生成环状碳酸酯的反应.采用傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)表征催化剂的结构和形貌,采用X射线光电子能谱(XPS)、元素分析(EA)和热重分析(TGA)研究了醇胺离子液体的嫁接量和热稳定性.在环加成反应中,该催化剂无需溶剂和助催化剂,在催化剂用量为0.10 g、温度为120℃、CO_(2)压力为2 MPa以及反应时间为4 h的条件下,碳酸丙烯脂(PC)的产率达到93.30%,并且反应后容易分离,可重复使用.最后提出了羟基形成的氢键可激活环氧化物和I-亲核进攻促进开环的反应机理.
The alcohol amine ionic liquid(TEA)was grafted onto chloromethyl polystyrene(PS-Cl)microspheres through alkylation reaction and the simple one-pot method and the resulting ionic liquid-supported catalyst(PS-[TEA]I)was used to catalyze the formation of cyclic carbonates from carbon dioxide and epoxides.The structure and morphology of the catalyst were characterized with the Fourier transform infrared spectroscopy(FT-IR)and the scanning electron microscope(SEM).The grafting amount and the thermal stability of alcohol amine ionic liquids were studied with the X-ray photoelectron spectroscopy(XPS),the elemental analysis(EA)and the thermogravimetric analysis(TGA).In the cycloaddition reaction,the catalyst did not require solvents and co-catalysts.Under the experimental conditions of catalyst dosage of 0.10 g,120℃temperature,2 MPa CO_(2) pressure and 4 h reaction time,the yield of propylene carbonate(PC)reached 93.30%.It was easy to separate after the reaction and could be reused.The reaction mechanism of hydrogen bond formed with hydroxyl activating epoxide and I-nucleophilic attack to promote ring opening was finally proposed.
作者
卢金凯
张梦
初秉宪
金理健
肖健泽
李斌
董丽辉
范闽光
LU Jinkai;ZHANG Meng;CHU Bingxian;JIN Lijian;XIAO Jianze;LI Bin;DONG Lihui;FAN Minguang(School of Chemistry and Chemical Engineering, Guangxi University∥Guangxi Key Laboratory of Petrochemical Resources Processing and Process Intensification Technology, Nanning 530004, China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2021年第6期43-49,共7页
Journal of South China Normal University(Natural Science Edition)
基金
国家自然科学基金项目(21968002)
广西石化资源加工及过程强化技术重点实验室项目(2019k006)。
关键词
二氧化碳的固定
醇胺离子液体
非均相催化
聚苯乙烯
环状碳酸酯
carbon dioxide fixation
alcohol amine ionic liquid
heterogeneous catalysis
polystyrene
cyclic carbonate
