A polyimide-derived graphene-coated catalyst and a preparation method and application thereof

By preparing a polyimide-derived graphene-encapsulated platinum catalyst, the corrosion problem of the catalyst in the nitrobenzene process for preparing p-aminophenol under acidic conditions was solved, achieving catalytic performance with high activity, high selectivity, and long lifespan.

CN119793446BActive Publication Date: 2026-06-23ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Filing Date
2024-12-17
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The existing catalysts for the preparation of p-aminophenol by the nitrobenzene process are easily corroded in acidic environments, leading to catalyst deactivation and low yield. It is also difficult to maintain high activity and selectivity under acidic conditions.

Method used

By encapsulating a platinum catalyst with polyimide-derived graphene and controlling the carbon source precursor, carbonization temperature, and treatment atmosphere, a carbon layer with high nitrogen content and specific configuration is prepared, forming a stable carbon-coated catalyst that enhances the catalyst's acid resistance and active sites.

Benefits of technology

Under acidic conditions, the catalyst exhibits high activity, high selectivity, and stability. Platinum metal is not easily lost, and the catalyst exhibits better stability than traditional supported catalysts, thereby improving the selectivity and yield of the target product.

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Abstract

The application discloses a polyimide-derived graphene-coated catalyst and a preparation method and application thereof. The preparation method is as follows: (1) a supported platinum catalyst is weighed, the supported platinum catalyst is added into a polyamide acid solution, and a mixture is obtained after sufficient mixing; (2) the mixture is transferred into an autoclave, heated at 150-200 DEG C in an oven for 8-15 hours, the obtained mixture is cooled to room temperature, and a dry product is obtained through washing, suction filtration and vacuum drying; (3) the dry product is ground, high-temperature calcination is carried out under a nitrogen atmosphere, and then, secondary high-temperature calcination is carried out under an inert protective atmosphere, a hydrogen atmosphere or a vacuum state, so as to obtain a polyimide-derived graphene-coated platinum catalyst. The application provides application of the polyimide-derived graphene-coated platinum catalyst in preparation of p-aminophenol through nitrobenzene hydrogenation rearrangement, and the catalyst has high conversion rate, selectivity and stability.
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