An in-situ supported palladium-on-carbon catalyst, its preparation method and application

By controlling the growth and dispersion of palladium nanoparticles through in-situ loading, the problems of inhomogeneity and easy leaching of palladium-carbon catalysts were solved, achieving the preparation of efficient and stable palladium-carbon catalysts and improving catalytic activity and service life.

CN122298398APending Publication Date: 2026-06-30CHINA CHENGDA ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA CHENGDA ENG
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Palladium-on-carbon catalysts prepared by existing impregnation methods suffer from problems such as uneven palladium nanoparticle size, poor dispersion, easy agglomeration, and leaching, which affect the stability and service life of the catalyst.

Method used

The in-situ loading method is adopted. By preparing metal salt and modified reducing aqueous solution, surface modifiers such as polyvinylpyrrolidone and hexadecyltrimethylammonium bromide are used in combination with reducing agents such as formaldehyde and hydrazine hydrate to control the growth of nanoparticles and form a uniform and stable dispersion. The stability is improved by calcination treatment.

Benefits of technology

Pd nanoparticles with small and uniform particle size were prepared, which significantly improved catalytic activity and stability, reduced leaching, and lowered costs.

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Abstract

This invention discloses an in-situ supported palladium-on-carbon catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The preparation method includes: preparing a palladium metal salt solution; dissolving a surface modifier and a reducing agent in water to obtain a modified reducing aqueous solution; immersing pretreated activated carbon in the modified reducing aqueous solution to obtain a modified reducing activated carbon suspension; subjecting the palladium metal salt solution to a reduction reaction with the reduced activated carbon suspension to obtain a palladium-on-carbon catalyst suspension; removing the solvent from the palladium-on-carbon catalyst suspension, and washing and calcining the resulting solid product to obtain the final palladium-on-carbon catalyst. This invention also discloses the in-situ supported palladium-on-carbon catalyst prepared by the above method and its application as a hydrogenation catalyst. The Pd nanoparticles supported on the palladium-on-carbon catalyst of this invention have regular morphology, small particle size, narrow and uniform particle size distribution, good dispersibility, good loading stability, and low leaching during use.
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