Synthesis Of Magnetic Catalyst Cu-BTC And Their Catalytic Properties

Metal-Organic Frameworks, a new type of material, is developing very rapidly in last decade. Since it has some excellent properties, such as 3D channel structure, larger specific surface area, more active, easy to functional and so on, it has been widely used in hydrogen storage, catalysis, adsorption, and other fields. Therefore, it also becomes a new type of porous materials except carbon nanomaterials and zeolite. Especially in the field of catalysis, because MOFs category is numerous, and functional direction can be customized, so it received extensive development.Such as the use of the catalytic activity of MOFs itself, or to use its 3D channel structure load reactive group, or MOFs functionalization, etc., targeted to speed up certain types of chemical reactions. When the end of the reaction, MOFs are often not easy to be recycled, So the research about magnetic carrier becomes more necessary.This paper studied the preparation and functionalization of load type catalyst, and characterized the structure form of MOFs by TEM, SEM, FT-IR, XRD, and N2 adsorption/stripping methods. At last, its catalytic performance was evaluated by Ullmann reaction of iodoacetophenone and phenol. Specific studies are as follows:A new type of magnetic Cu-BTC@SiO2@Fe3O4 catalysts was synthesized. In the first step, Fe3O4 nanoparticles was synthesised with FeCl3 as source of iron, PVP as dispersing agent, and ethylene glycol as solvent. Then its surface load a uniform layer of SiO2 protective shell with the hydrolyzing of TEOS. By ultrasonic method, the surface of the magnetic core SiO2@Fe3O4 generated a layer of porous MOFs Cu-BTC with H3BTC and copper acetate as raw material. By means of FT-IR, XRD, TEM and BET, the structure form of magnetic core was found to be good. Cu-BTC was found to be wrapping around the magnetic core SiO2@Fe3O4, forming a shell thickness of about 30nm. For its catalytic performance, by evaluating the Ullmann reaction of iodoacetophenone and phenol, its catalytic performance was found to be good.The Ni/Cu-BTC@SiO2@Fe3O4 catalysts was synthesized. Using porous adsorption characteristics of Cu-BTC, we synthesized the Ni/Cu-BTC@SiO2@Fe3O4 catalysts by dipping method and reduction method of NaBH4. By means of FT-IR, XRD, TEM and N2 adsorption/stripping, the structure form of Ni/Cu-BTC@SiO2@ Fe3O4 was found to be good, though the thickness of Cu-BTC was reduced. For its catalytic performance, by evaluating the Ullmann reaction of iodoacetophenone and phenol, its catalytic performance was found to be good. Compared with Cu-BTC@SiO2@ Fe3O4, the reaction time and the amount of base was reduced now. So it has a higher reaction efficiency with the Ni/Cu-BTC@SiO2@Fe3O4 catalysts.