Preparation method and application of carbon-doped coated platinum catalyst

Abstract

The invention discloses a preparation method and application of a carbon-doped coated platinum catalyst. The preparation method of the doped carbon-coated platinum catalyst comprises the following steps: weighing a supported metal platinum catalyst, adding water into the supported platinum catalyst, uniformly mixing, adding hydrogen peroxide with the concentration of 2-5wt%, stirring for 0.5-4 hours at the temperature of 30-50 DEG C, adding a soluble carbon source compound and a soluble heteroatom-containing compound, dipping for 0.5-10 hours at room temperature, and carrying out vacuum drying until moisture is dried, so as to obtain the doped carbon-coated platinum catalyst. And then carrying out high-temperature roasting for 2-10 hours at the temperature of 400-1000 DEG C in an inert protective atmosphere, a hydrogen atmosphere or a vacuum state to prepare the doped carbon-coated platinum catalyst. The catalyst provided by the invention has a complete carbon layer wrapping metal active component with a proper structure and thickness, so that the stability of the reaction process is ensured, and the catalyst has better activity and selectivity. The catalyst is used for a reaction for preparing p-aminophenol through nitrobenzene catalytic hydrogenation rearrangement, and has high stability and high target product yield.

Description

(1) Technical field [0001] The invention relates to a preparation method of a carbon-doped platinum catalyst and its application in the preparation of p-aminophenol by hydrogenation and rearrangement of nitrobenzene. (2) Background technology [0002] Supported noble metal catalysts have excellent hydrogenation performance and are widely used. However, in a strongly acidic reaction environment, precious metals are easily lost, resulting in deactivation of the catalyst. [0003] P-aminophenol is an important chemical raw material and organic intermediate, widely used in medicine, dyes, antioxidants, photosensitive materials and pesticides and other fields. In the pharmaceutical industry, p-aminophenol can be used to synthesize paracetamol (paracetamol), adipine, buprofen, vitamin B, compound amides and other drugs. At present, the largest use of para-aminophenol is for the synthesis of paracetamol, an antipyretic and analgesic drug. In the rubber industry, p-aminophenol ca...

AI Technical Summary

Problems solved by technology

Although the process is mature, the three wastes are discharged and the product purity is low.

[0005] Catalytic hydrogenation of nitrobenzene to generate hydroxyaniline, and then Bamberger rearrangement reaction in acidic medium, one-step generation of p-aminophenol is a green and efficient synthesis process, but the disadvantage is that the selectivity of the target product p-aminophenol is low, and Hydrogenation catalyst (the main active component is Pt) in a strongly acidic reaction environment, the noble metal is easy to lose, resulting in catalyst deactivation

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