Preparation method of magnetic nanoparticle supported precious metal catalyst

Abstract

The preparation method of a magnetic nanoparticle supported precious metal catalyst comprises the following steps: grafting the silane coupling agent containing thiol to the surface of magnetic ferriferrous oxide nanoparticles, using the thiols on the surface to conduct the click reaction with vinyl organic ligand compound to form magnetic nanoparticle supporting complex, complexing with precious metal salt to acquire the magnetic nanoparticle supported precious metal catalyst. According to the method, the click chemical reaction is used to combine the magnetic nanoparticle surface and the vinyl organic ligand compound by covalent bonds, and solidly bind the ligand to the magnetic nanoparticle. At the same time the method can guarantee that the ligand is far from the supporter, and can coordinate with the precious metal in a better way to achieve the effect of homogeneous catalysis. Moreover under the external magnetic field, the catalyst is easy to be magnetized, and has the advantage of fast separation, fast recycling and reusable features. The method can lower the production cost, and enhance the production efficiency. The catalyst prepared by the method can be used in the coupling reaction and addition reaction of metal catalytic reaction.

Description

technical field [0001] The invention relates to a method for preparing a magnetic nanoparticle-loaded noble metal catalyst based on a click chemistry method, which belongs to the technical field of catalysts. Background technique [0002] Noble metal catalyzed reaction is one of the important means of organic chemical synthesis methods, but these noble metal catalysts are difficult to sort and recover from the reaction system, which increases the cost of the reaction, and even organometallic catalysis such as palladium metal will cause palladium black during the reaction process, which not only reduces the activity of the catalyst , but also pollute the reaction product, which is greatly limited in practical application. Therefore, more and more scientific researchers are solving these problems through the research on supported catalysts, striving to maintain the high efficiency of homogeneous catalysts, solve the recycling of catalysts, and achieve the goals of minimum cons...

AI Technical Summary

Problems solved by technology

However, whether it is an organic polymer carrier or an inorganic carrier, its catalytic activity, stability and recycling performance need to be further improved, and its application range is quite limited.

In recent years, magnetic nanoparticles have received widespread attention as catalyst supports, and the technical means is to use magnetic Fe 3 o 4 The surface of nanoparticles is coated with a thin layer of silica gel, and various organic ligands are connected to the hydroxyl groups on the surface, but the content of precious metals is also low, resulting in an increase in usage, and the activity of the nanoparticles is gradually reduced due to the weak ligands during recycling.