A kind of graphene catalyst supported by metal particles and preparation method thereof

Abstract

The invention discloses a graphene catalyst supported by metal particles and a preparation method thereof, belonging to the technical field of catalysts. The present invention adds platinum dioxide, graphene, diphenylamine, bromobenzene, and carbon nanotubes, wherein platinum dioxide and carbon nanotubes are doped, and graphene is combined with diphenylamine and triphenylamine after halogenation. Graphene and carbon nanotubes were hot pressed to form a new catalyst. In the present invention, the combination of carbon nanotubes and graphene is selected on the carrier, which increases the contact area between the catalyst and the two reaction substances. On the other hand, it can increase the thermal stability of the catalyst. Platinum dioxide is selected as the catalyst in the design. Added diphenylamine and halogen, on the one hand, can enhance the activity of platinum dioxide, on the other hand, can increase the stability of the catalyst, and improve the life and effect of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a graphene catalyst supported by metal particles and a preparation method thereof. Background technique [0002] In the production method of aniline, the traditional nitrobenzene iron powder reduction method is to dissolve nitrobenzene in a solvent, reduce iron powder as a catalyst, add acid and then heat the reaction, then add alkali to adjust the pH, and finally extract. This reaction is very complicated and the iron powder produced is difficult to handle. [0003] Nitrobenzene catalytic hydrogenation method, compared with the traditional method, its process is simple and suitable for large-scale, industrial production can be carried out, the product is convenient to handle, and will not contain unnecessary impurities. The disadvantage lies in the consumption of the catalyst. The catalyst generally uses precious metals, but precious metals The high price limits t...

AI Technical Summary

Problems solved by technology

[0002] In the production method of aniline, the traditional nitrobenzene iron powder reduction method is to dissolve nitrobenzene in a solvent, reduce iron powder as a catalyst, add acid and then heat the reaction, then add alkali to adjust the pH, and finally extract. This reaction is very complex and the iron powder produced is difficult to handle

[0003] Nitrobenzene catalytic hydrogenation method, compared with the traditional method, its process is simple and suitable for large-scale, industrial production can be carried out, the product is convenient to handle, and will not contain unnecessary impurities. The disadvantage lies in the consumption of the catalyst. The catalyst generally uses precious metals, but precious metals High price limits the development of catalytic hydrogenation of nitrobenzene

[0004] The catalytic hydrogenation reaction uses hydrogen as the main source of hydrogen ions, because hydrogen is in a flowing state and needs to be inserted into the solvent. The surface area of ​​the traditional catalyst is too small, and the contact area between the two reactants and the catalyst is limited, resulting in a long reaction time. , lower yield and lower selectivity

[0005] In the catalyzed hydrogenation of nitrobenzene, the main catalyst used is platinum dioxide, and the air contains moisture. The contact between platinum dioxide and the moisture in the air, as well as impurities inside, lead to a decrease in the activity of platinum dioxide, thereby reducing the catalyst performance

The catalytic hydrogenation reaction of nitrobenzene is an exothermic reaction and requires a certain pressure, so the reaction needs to be restricted to a certain extent. If the reaction is not restricted, it may be dangerous, so the development of a catalyst that can meet the requirements of nitrobenzene The catalyst required for hydrogenation reaction production is particularly important

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