A method for preparing amine compounds using a reversed-phase metal catalyst

By using non-precious metal reversed-phase catalysts such as reversed-phase CeOx/Ni and reversed-phase CeYOx/Co, a highly efficient hydrogenation amination reaction using lignin-based phenolic compounds as raw materials was achieved, solving the problem of high cost of precious metal catalysts and realizing the green synthesis of high-value-added amine compounds.

CN122355835APending Publication Date: 2026-07-10NANJING TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING TECH UNIV
Filing Date
2026-04-20
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing technologies, precious metal catalysts are expensive and dependent on non-renewable resources, which limits the large-scale application and raw material adaptability of lignin-derived aromatic monomers, making it difficult to efficiently prepare high-value-added amine compounds such as 4,4'-methylenediphenylamine and hexamethylenediamine.

Method used

Using non-precious metal reversed-phase catalysts, such as reversed-phase CeOx/Ni and reversed-phase CeYOx/Co, lignin-based phenolic compounds are converted into amine compounds through hydrogenation amination reactions. The reaction is carried out in two or one steps under hydrogen and ammonia atmospheres using reversed-phase nickel/cobalt-based metal catalysts.

Benefits of technology

It enables the efficient preparation of a series of monocyclic anilines and complex bicyclic amines in a green and sustainable manner, with selectivity and yield reaching 80%-90%. It is applicable to structurally complex compounds, reduces costs, and improves the adaptability of raw materials.

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Abstract

This invention discloses a method for preparing amine compounds using a reversed-phase metal catalyst, belonging to the field of high-quality biomass utilization technology. The method uses lignin-based phenolic compounds as raw materials and employs a reversed-phase nickel / cobalt-based metal catalyst for hydrogenation-ammoniation to prepare amine compounds. The reversed-phase nickel / cobalt-based non-noble metal catalyst of this invention possesses both active sites suitable for hydrogenation and active sites suitable for amination / dehydrogenation, exhibiting both highly efficient hydrogenation and amination / dehydrogenation dual functions. This significantly improves the selectivity and yield of amine compounds and has been successfully applied to more structurally complex bicyclic phenolic compounds.
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