Preparation of a palladium-supported highly crystalline carbon nitride and its application in catalytic dehydrogenation of dipentene

By preparing palladium-supported high-crystalline carbon nitride catalysts, the problems of low catalytic efficiency, selectivity and poor stability of traditional catalysts are solved, and efficient dipentene dehydrogenation preparation has good stability and recovery properties for umbrella hydrocarbons.

CN116689010BActive Publication Date: 2025-04-29HUAQIAO UNIVERSITY +2
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Patent Information

Application Number
CN202310651336.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-02
Publication Date
2025-04-29
Estimated Expiration
2043-06-02

AI Technical Summary

Technical Problem

The traditional catalytic dehydrogenation preparation of dipentene has problems such as low catalytic efficiency and selectivity, poor stability, difficulty in recycling, and environmental pollution, which restricts its application.

Method used

High crystalline carbon nitride was prepared by calcining the nitrogen-containing precursor and mixing it with alkali metal halide salt, calcining and grinding, and then supporting metal palladium by chemical reduction method to prepare a palladium-supported high crystalline carbon nitride catalyst.

Benefits of technology

The prepared palladium-supported high-crystalline carbon nitride catalyst has high activity, good stability, easy recovery and functionalization, and can effectively promote the dipentene dehydrogenation reaction. The content of the dipentene hydrocarbon in the product reaches 89.74%, and the dipentene conversion rate and selectivity for the dipentene hydrocarbon are close to 100%.

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Abstract

The invention discloses a preparation method of palladium-loaded high-crystalline carbon nitride and its application in catalytic dehydrogenation of dipentene. The preparation method of palladium-loaded high-crystalline carbon nitride comprises the following steps: calcining a nitrogen-containing precursor and mixing it evenly with an alkali metal halide salt, calcining and grinding to obtain a solid powder, and then washing, drying and grinding the obtained solid powder to obtain a high-crystalline carbon nitride; and then loading metal palladium on the high-crystalline carbon nitride by a chemical reduction method to obtain a palladium-loaded high-crystalline carbon nitride catalyst. The obtained palladium-loaded high-crystalline carbon nitride has an ordered crystal structure, nanosheet morphology, pore structure and nitrogen-rich micro-heterocyclic structure, so that the binding force between the high-crystalline carbon nitride and palladium nanoparticles is stronger, the palladium nanoparticles are small in size, uniformly dispersed and stable, and the catalytic dehydrogenation performance of dipentene is improved. The catalyst is applied to the reaction of preparing p-cymene by catalytic dehydrogenation of dipentene to obtain a high-quality p-cymene product.
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