Synthesis And Catalytic Performance Of Metal Nanoparticles-MOFs Composites

Metal-Organic Framework(MOF)as one of organic-inorganic hybrid materials,has shown potential application prospects in many fields,especially in catalysis,due to its high specific surface area,structural diversity,tailoring and other characteristics.In recent years,active metal nanoparticles(MNPs)have attracted great interest because they are confined in the skeleton/cavity/channel of MOFs or coated by MOFs.As packaging substrates,MOFs can effectively promote the mass transfer and diffusion of substrates and products,and a variety of metal joints and adjustable organic binder can produce excellent synergies with the encapsulated active MNPs.The results obtained are as follows:1.Although MOFs-based nanocomposites have been widely reported at present,their development has reached a bottleneck,which is reflected in high synthesis cost,single material component,and performance to be optimized.Therefore,we mainly break through this bottleneck from these three aspects.In this work,Cu₂O nanocrystals were first synthesized,and Cu₂O-based MOF was successfully constructed on Cu₂O surface with regular morphology by in-situ etching to obtain Cu₂O@HKUST-1.Then,nano-catalyst was obtained by reducing with NH₃BH₃.The obtained Cu@HKUST-1 effectively combines the plasma photothermal effect and hydrogenation activity of Cu NCs with the Lewis acidity of MOF to realize the synergistic catalysis of one-pot.In this study,the SPR effect of metal nanocrystals was properly combined with Lewis acid of MOFs for the first time to realize the synergistic catalysis of single-pot series reactions.2.Although the application value of MOFs has been reflected in many fields,it has some shortcomings such as poor thermal stability and acid-base stability.In order to enhance the stability of MOFs in the catalytic process,the porous carbon materials derived from MOFs have attracted extensive attention of scientists.In the second project of this paper,we synthesized a new type of MOFs and obtained a porous carbon catalyst through simple gradient calcination.The catalyst has better catalytic activity for the catalytic dehydrogenation of NH₃BH₃,and then catalyze the reduction of nitrobenzene or olefins hydrogenation.In addition,the transitional metal catalyst,is economical and cheap,easy to recycle,and can be reused for many times,which is particularly important for the practical application of metal catalysts in industrial catalysis.