Palladium-supporting multilayer composite film and preparation method thereof

Abstract

The invention discloses a palladium-supporting multilayer composite film and a preparation method thereof. According to the invention, a layer of organic high-molecular film is sprayed onto the surface of a substrate; the substrate is repeatedly soaked in a palladium salt water solution and a fluorenone pyridine solution; and the multilayer composite film is formed with a self-assembly manner. The preparation process of the film substrate is simple, and the performance of the film is stable. The film assists in highly effectively catalyzing a carbon-carbon coupling reaction, and can be repeatedly used, such that catalyst consumption is reduced, and environment pollution is reduced. The film can be widely applied in the field of catalysis.

Description

technical field [0001] The invention belongs to the field of thin-film catalysis, and in particular relates to a palladium-loaded multilayer composite thin-film substrate for catalytic coupling reaction and a preparation method thereof. Background technique [0002] Biphenyl compounds constructed by carbon-carbon coupling reactions are widely found in people's daily life, such as agrochemicals, medicinal chemistry, natural products, commercial dyes, liquid crystal materials, and functional materials. Therefore, carbon-carbon coupling reactions are organic One of the most important methods in synthetic reactions has always been a research hotspot in the fields of catalytic chemistry, organic chemistry, and material chemistry. The cross-coupling reaction catalyzed by transition metals or their complexes is one of the most important means to construct the structure of biphenyl. Complete under milder conditions. Metal Pd or its complexes are one of the most widely used and eff...

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Problems solved by technology

[0003] In recent years, both homogeneous palladium catalysts and heterogeneous palladium catalysis have been greatly developed. Homogeneous palladium catalysts have been widely used due to the advantages of mild reaction conditions, good catalytic effect, high selectivity and less by-products in the reaction. application, but because it is difficult to separate from the product, the disadvantages such as the low service life of the catalyst limit its application, such as a kind of spirofluorene pyridine palladium nanoparticles disclosed by Zhao Xiuhua et al. and its preparation method (CN103951611A), the catalytic efficiency is high, but not easy to recycle

Heterogeneous catalysts are easy to separate from the product and can be recycled multiple times, but the catalytic efficiency is not as good as that of homogeneous palladium catalysts, and the required reaction temperature is high, thus limiting its industrial application

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