N-Doped Mesoporous Carbon Supported Pd NPs For Coupling Reaction

In recent years, with the rapid development of modern science and technology, especially nanotechnology, porous material with its excellent physical and chemical performance has caught people’s attention. Porous carbon materials is one of the most important new materials in recent decades, because it has stability under high temperature, and the advantages of acid and alkali resistance and organic solvent, and it is not expensive and easy to get. The carbon materials show a huge value of research and application in gas adsorption, metal catalyst, hydrogen storage and fuel cell. In this study, we use a new type of porous carbon as carrier to prepare the porous carbon supported nanopalladium catalysts (Pd@MPC), the catalyst has good mechanical strength and thermal stability. In addition, the catalyst has capsule-like porous structure, which brings it high specific surface area and porosity. Our studies show that the catalyst has a very high catalytic performance for the Sonogashira coupling reaction. It can get almost quantitative high yields with aromatics iodine and aromatics bromine in low load of palladium, and be able to achieve Sonogashira coupling reaction of chlorobenzene. Compared with reported heterogeneous catalysts, the catalyst also has the advantages of recycling, environmental protection, and can still maintain higher catalytic activity repeated use 5 times.Study shows that it can effectively change the properties of carbon material, such as adsorption, surface polarity and electrical conductivity, and enhance the interaction between active component and carriers by introducing N atoms into the carbon material. At the same time, it can improve the stability and the activity of catalyst. This thesis focuses on the forefront and trend of development of N-doped mesoporous carbon materials. It research on one-step synthesis method of N-doped mesoporous carbon materials, and regulate the synthetic conditions and synthetic route. We successfully synthesized ordered mesoporous carbon (N-MPC), and then prepared the Pd@N-MPC with ethylene glycol reduction method to investigate its application in Heck reaction. It is found that in the water/ethylene glycol mixture solvent, and the presence of CH3COOK, Pd@N-MPC has excellent catalytic performance for aryl iodide, and after recycling five times, the catalyst structure still remains the same, catalytic performance was not significantly reduced. our work of this paper has important scientific significance for designing and discovering new carbon catalyst, applying the carbon catalyst in industry.