The Preparation And Properties Of A Series Of UiO-based Catalysts Via Pre-Synthesis And Post-Modification Methods

Metal–organic frameworks?MOFs?are,to some extent,a special class of porous materials with excellent structure and excellent performance.In recent years,the study of MOFs materials is becoming more and more deeper,especially in the field of catalysis,MOFs materials play a key role.Due to the fine structure and functional properties of UiO-based MOFs,four kinds of UiO-based catalysts were received via the pre-synthesis and post-modification methods.The structural characterizations and catalysis properties of UiO-based catalysts were investigated,such as hot catalysis,photocatalysis,chiral catalysis.?.We got a UiO-67-type MOF?UiO-67-IM,1?which is decorated withn-pentadecyl-attached imidazolium salt via direct ligand functionalization.we got a UiO-67-type MOF?UiO-67-IM,1?which is decorated with n-pentadecyl-attached imidazolium salt via direct ligand functionalization.1 can realize the catalysis of azide reaction and thiocyanate reaction of benzyl halide.The results show that the catalyst has good catalytic effect,high catalytic yield,and the catalyst can be recycled,and the catalytic efficiency of the catalyst is almost no change in 5 cyclic catalytic reactions.?.CuI was load to 1 by post-modification method to got the bifunctional compositecatalyst CuI@UiO-67-IM?2?.Due to the introduction of CuI,the catalyst can catalyze the“Click”reaction.The result shows that the catalytic effect is good and the yield is high.We further studied the“one–pot”tandem reaction,and the result also showes the catalyst has high efficiency.The catalyst can be recycled and reused more than five times.?.The chiral functional group was introduced by the pre-modified synthesismethod,and the chiral catalyst uio-68-chiral?3?was obtained.After that TiO₂was loaded into 3 by the post-modification synthesis method,we got the composite chiral catalyst TiO₂@uio-68-chiral?4?.By using the compound chiral catalyst 4,the order"one pot"oxidation and Morita-Baylis-Hillman reaction was successfully carried out,with high yield and enantioselectivity.Using 4 to realize the series reaction of light and hot"one pot"reaction under mild conditions,the catalyst can be recycled more than 5 times.It shows that MOFs materials of UiO combined with some new functional groups in catalytic reaction will have good catalytic effect.The research of this paper has enriched the research content of MOFs material application in catalysis.