The Preparation Of Cu₂O@HKUST-1 Core-shell Structure Catalyst And Study On Its Catalytic Property

Cuprous oxide, its molecular formula is Cu₂O and molecular weight is 143.05, melting point is 1235 ?. Cuprous oxide is an important inorganic metallic oxide which have low price and mild reaction condition to catalyze organic reaction so received extensive attraction. However, nanoscale cuprous oxide is easily oxidized in air which cause some difficulty in using and development in science research. Metal-organic frameworks, MOFs have great potential in optics and magnetism and catalyze and gas sparing-storage, because of there are many characteristics such as large specific surface area, high porosity, abundant unsaturated coordination, disperse metal active site and strongly functionalization. Combining with the advantages of both, we can protect the cuprous oxide from oxidation when selective reactant shape with the affluent pore structure.The thesis would introduce a designed method to synthesis Cu₂O@HKUST-1 core-shell structure. We use the Cu₂O about 100 nm as template, through partly self-sacrifice its surface molecule to coordinate 1,3,5-H3 BTC so formative Cu₂O@HKUST-1 core-shell structure with HKUST-1 shell and Cu₂O core. After testing by some catalyst characterizations such as PXRD and TEM, they prove the structure have some physicochemical characteristicsc. Inspecting the designed synthesis Cu₂O@HKUST-1 structure's catalytic effect in carbon monoxide probe reaction, we found the outer layer's HKUST-1 can gathering gas so it can slowly release and restore gas molecule, which protect the active centre, cuprous oxide, from oxidation in relatively high temperature and oxygen phenomenon. In addition, we can limited the range of reactant with the abundant homogeneous duct of HKUST-1 shell structure. We apply the designed catalyst to the coupled reaction of phenylboronic acid and its ramification, the 3,5-dimethyl phynylbornic acid and 3,5-diphenyl phynylbornic acid. The result of reaction shows that as the increasing of molecular weight of phenylboronic acid ramification, the comparison of core-shell structure catalyst and cuprous oxide would be more obvious.Besides, this thesis firstly make use of electron beam irradiate technology, irradiating the classic MOFs formation with electron beam and using for styrene epoxidation reaction. The experimental result prove the HKUST-1 material have obvious improvement of the selective of the production, that styrene oxide after dealing.