高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2474.doi: 10.7503/cjcu20210221

• 物理化学 • 上一篇    下一篇

Zr-MOF空心纳米球固载离子液体对CO2环加成反应的催化性能

李美燕, 陈紫娟, 汪淑华(), 陈超()   

  1. 南昌大学化学学院,江西环境与能源催化重点实验室, 南昌 330031
  • 收稿日期:2021-04-06 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 汪淑华,陈超 E-mail:shwang@ncu.edu.cn;chaochen@ncu.edu.cn
  • 基金资助:
    国家自然科学基金(21961021);江西省自然科学基金重点项目(20202ACB203001)

Zr-MOF Hollow Nanospheres Supported Ionic Liquid for CO2 Cycloaddition Reaction

LI Meiyan, CHEN Zijuan, WANG Shuhua(), CHEN Chao()   

  1. Key Laboratory of Jiangxi Province for Environment and Energy Catalysis,College of Chemistry,Nanchang University,Nanchang 330031,China
  • Received:2021-04-06 Online:2021-08-10 Published:2021-08-05
  • Contact: WANG Shuhua,CHEN Chao E-mail:shwang@ncu.edu.cn;chaochen@ncu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21961021);the Natural Science Foundation of Jiangxi Province, China(20202ACB203001)

摘要:

通过后合成修饰方法(PSM)构筑了空心纳米球(Void@UiO-66-Ⅰ)和实心块(UiO-66-Ⅰ) 2种形貌的季铵盐功能化UiO-66-NH2(Zr), 得到兼具酸碱活性位点和氢键给体的新型功能化金属-有机框架材料. 通过一系列表征证明2种催化剂的成功合成, 并将它们用于催化转化CO2和氧化苯乙烯的环加成反应. 由于Void@UiO-66-Ⅰ催化剂的季铵盐部分含有大量的羟基和卤素阴离子, 可以通过氢键和亲核攻击与环氧化合物连接, 诱导环氧化合物开环, 促使反应顺利进行, 且催化剂的中空结构有利于物质进出催化剂, 起到加快反应速率的作用, 使得该催化剂在CO2与氧化苯乙烯环加成反应中表现出比实心块UiO-66-Ⅰ催化剂更好的催化性能. Void@UiO-66-Ⅰ催化剂在120 ℃, CO2压力为1.2 MPa, 反应时间为6 h, 无溶剂和助催化剂的反应条件下, 碳酸苯乙烯酯的收率和选择性分别为85.5%和95%.

关键词: UiO-66, 纳米空心球, 季铵盐, 后合成修饰, 二氧化碳环加成

Abstract:

Hollow nanosphere Void@UiO-66-Ⅰ and bulk UiO-66-Ⅰ were designed and prepared by post- synthetic modification(PSM) technique. Such two Zr-MOFs functionalized by quaternary ammonium salt possessed acid-base active sites and hydrogen bond donors. A series of characterization results demonstrated that the two catalysts were successfully synthesized and could be used to catalyze the cycloaddition reaction of CO2 and styrene oxide. Due to the quaternary ammonium salt of Void@UiO-66-Ⅰ with a large number of hydro-xyl groups and halogen anion, it could induce the epoxide ring-opening by hydrogen bond and nucleophilic attack of the iodide, promoting the reaction proceed smoothly. Moreover, the hollow structure of Void@UiO-66-Ⅰ was conducive to the mass transport. Therefore, it showed better catalytic performance than bulk UiO-66-Ⅰ catalyst for the reaction of CO2 and styrene oxide cycloaddition. Under optimal reaction conditions(120 ℃, initial CO2 pressure 1.2 MPa, 6 h), without solvent and co-catalyst, the yield and selectivity of styrene carbonate(SC) were 85.5% and 95.2%, respectively.

Key words: UiO-66, Hollow nanospheres, Quaternary ammonium salt, Post-synthetic modification, CO2 cycloaddition reaction

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