SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 222-229.DOI: 10.1016/j.cjche.2022.02.016

• • 上一篇    下一篇

Defective NH2-UiO-66 (Zr) effectively converting CO2 into cyclic carbonate under ambient pressure, solvent-free and co-catalyst-free conditions

Xueting Liu, Chunhui Hu, Jingjing Wu, Peng Cui, Fengyu Wei   

  1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei 230009, China
  • 收稿日期:2021-10-21 修回日期:2022-02-12 出版日期:2022-03-28 发布日期:2022-04-28
  • 通讯作者: Fengyu Wei,E-mail:weifyliuj@hfut.edu.cn
  • 基金资助:
    This work was financially supported by the Anhui Provincial Natural Science Foundation (No. 1908085MB42), the National Natural Science Foundation of China (Grant. 51372062).

Defective NH2-UiO-66 (Zr) effectively converting CO2 into cyclic carbonate under ambient pressure, solvent-free and co-catalyst-free conditions

Xueting Liu, Chunhui Hu, Jingjing Wu, Peng Cui, Fengyu Wei   

  1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei 230009, China
  • Received:2021-10-21 Revised:2022-02-12 Online:2022-03-28 Published:2022-04-28
  • Contact: Fengyu Wei,E-mail:weifyliuj@hfut.edu.cn
  • Supported by:
    This work was financially supported by the Anhui Provincial Natural Science Foundation (No. 1908085MB42), the National Natural Science Foundation of China (Grant. 51372062).

摘要: In this study, a series of metal–organic frameworks (MOFs) NH2-UiO-66-xHAc catalysts were synthesized by solvothermal method using acetic acid (HAc) as a modulator, and were applied to the cycloaddition of CO2 and epichlorohydrin (EPIC) under ambient pressure. Influences of the modulation by HAc on morphologies and structures of the MOFs are demonstrated via PXRD, FESEM, FTIR, N2 adsorption–desorption, XPS and 1H NMR characterizations. The results show that the MOFs containing mesoporous pores can be prepared by adjusting the concentration of HAc. By optimizing the amount of HAc added, the specific surface area of NH2-UiO-66-8HAc is as high as 879.17 m2·g-1, which is 28.3% higher than that of the original MOFs. And the evaluation of catalytic performance showed that HAc modulation enhanced the activity of NH2-UiO-66-xHAc under mild conditions. The exposure of Lewis acid sites, increased specific surface area and porosity via the modulation of HAc defective ligand can be supposed the key factors to determine the enhanced catalytic activities. In addition, considering the influence of gas concentration on the reaction, the concept of TOP (Turnover of Pressure, defined as the mass of conversions of a unit mass catalyst under unit pressure and unit time) was first proposed in this article.

关键词: CO2 conversion, Metal-organic frameworks, Acetic acid modulation, Defect, Mild conditions

Abstract: In this study, a series of metal–organic frameworks (MOFs) NH2-UiO-66-xHAc catalysts were synthesized by solvothermal method using acetic acid (HAc) as a modulator, and were applied to the cycloaddition of CO2 and epichlorohydrin (EPIC) under ambient pressure. Influences of the modulation by HAc on morphologies and structures of the MOFs are demonstrated via PXRD, FESEM, FTIR, N2 adsorption–desorption, XPS and 1H NMR characterizations. The results show that the MOFs containing mesoporous pores can be prepared by adjusting the concentration of HAc. By optimizing the amount of HAc added, the specific surface area of NH2-UiO-66-8HAc is as high as 879.17 m2·g-1, which is 28.3% higher than that of the original MOFs. And the evaluation of catalytic performance showed that HAc modulation enhanced the activity of NH2-UiO-66-xHAc under mild conditions. The exposure of Lewis acid sites, increased specific surface area and porosity via the modulation of HAc defective ligand can be supposed the key factors to determine the enhanced catalytic activities. In addition, considering the influence of gas concentration on the reaction, the concept of TOP (Turnover of Pressure, defined as the mass of conversions of a unit mass catalyst under unit pressure and unit time) was first proposed in this article.

Key words: CO2 conversion, Metal-organic frameworks, Acetic acid modulation, Defect, Mild conditions