Preparation And Catalytic Performance Of Metal Organic Framework Supported Ag Nanoparticle Catalysts

The metal organic framework materials(MOFs)is a novel multidimensional and organic-inorganic hybrid crystal material with a pore structure composed of metal ions as the center or inorganic clusters as "nodes".MOFs is self-assembled with organic polychromatic ligands such as carboxylic acids.In the reported porous materials,MOFs not only has a large specific surface area,low skeleton density and high pore volume,but also has the advantages of simple synthesis method,high stability and low price.and it has been applied in the gas separation and storage,catalysis,drug release,chemical sensing and fluorescent materials and other fields.In the field of catalysis,MOFs is considered to be a very promising carrier,and the preparation of catalysts by introducing metal active sites has become a hotspot.In this thesis,Ag@UIO-66 and Ag@MIL-101 composites were synthesized on the basis of the high stability of MIL-101 and UIO-66,and the styrene epoxidation catalysis was studied.The thesis was divided into four parts.The first part mainly introduced the preparation of MOFs,metal nanoparticles @MOF and which application in catalysis,as well as the significance and progress of the thesis.The second part mainly introduced the preparation methods of Ag@UIO-66 composite materials with different loading weight and the properties of catalyzing styrene epoxidation.Ag@UIO-66 composite materials were prepared using solution impregnation method to uniformly load Ag nanoparticles on the UIO-66.The structural properties of Ag@UIO-66 composite materials were analyzed with the methods of X-ray powder diffraction,infrared spectroscopy,transmission electron microscopy,and inductively coupled plasma emission spectroscopy.The third part mainly introduced the preparation of Ag@MIL-101 composite materials with different loading weight and the properties of catalyzing styrene epoxidation.The preparation was also carried out using thesolution impregnation method.And the structural properties of the prepared catalysts were characterized by X-ray powder diffraction,infrared spectroscopy,transmission electron microscopy and inductively coupled plasma emission spectroscopy.The fourth part was the conclusion part,which mainly summarized the synthesis methods and properties of the two kinds of composite materials Ag@UIO-66、Ag@MIL-101.The two kinds of composite materials have strong catalytic effect and high selectivity to styrene,and after a number of cycles still have good stability,The materials have potential application value in industrial catalysis.