Defective NH_(2)-UiO-66(Zr) effectively converting CO_(2) into cyclic carbonate under ambient pressure,solvent-free and co-catalyst-free conditions  

作　　者：Xueting Liu Chunhui Hu Jingjing Wu Peng Cui Fengyu Wei 

机构地区：[1]School of Chemistry and Chemical Engineering,Hefei University of Technology,Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical Engineering,Hefei 230009,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第3期222-229,共8页中国化学工程学报（英文版）

基　　金：financially supported by the Anhui Provincial Natural Science Foundation(1908085MB42);the National Natural Science Foundation of China(51372062)。

摘　　要：In this study,a series of metal-organic frameworks(MOFs)NH_(2)-UiO-66-x HAc catalysts were synthesized by solvothermal method using acetic acid(HAc)as a modulator,and were applied to the cycloaddition of CO_(2)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,N_(2)adsorption-desorption,XPS and ^(1)H 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 NH_(2)-UiO-66-8 HAc is as high as 879.17 m^(2)·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 NH_(2)-UiO-66-x HAc 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：CO_(2)conversion Metal-organic frameworks Acetic acid modulation Defect Mild conditions 

分 类 号：TQ225.52[化学工程—有机化工] TQ426[环境科学与工程—环境工程] X701