Catalyst as well as preparation method and application thereof

By preparing nitrogen-ligand-supported Rh/Ru bimetallic nanoparticle catalysts, the problems of low recovery rate and insufficient activity of heterogeneous catalysts were solved, achieving efficient and stable NBR hydrogenation, which is suitable for industrial production.

CN120904252APending Publication Date: 2025-11-07SHENZHEN XINYUANBANG TECH CO LTD
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Patent Information

Application Number
CN202510596881.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-09
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

The heterogeneous catalysts used in the current NBR to HNBR production have low recovery rates and low activity. The catalyst preparation process is complex and the activity decays too quickly, making it difficult to meet industrial requirements.

Method used

A nitrogen-containing ligand-supported bimetallic nanoparticle catalyst, composed of rhodium and ruthenium, was prepared by mixing, settling, washing, and drying specific ligands with metal ions to form Rh/Ru bimetallic nanoparticles with high specific surface area and stable crystal structure.

Benefits of technology

The catalyst exhibits high catalytic activity and selectivity, with NBR hydrogenation degree reaching over 91%. It also demonstrates good thermal stability, ease of storage and recovery, and a loss rate of less than 4%, making it suitable for industrial production.

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Abstract

In order to overcome the problems of low recovery rate and low activity of a heterogeneous catalyst used for preparing HNBR from NBR in the prior art, the invention provides a catalyst as well as a preparation method and application thereof. The catalyst comprises metal particles and nitrogen-containing ligands, the metal particles comprise metal rhodium and metal ruthenium, the nitrogen-containing ligands comprise M1 and M2, the structural formula of the catalyst is as shown in formula 1, and M1 and M2 are respectively and independently selected from at least one of benzimidazole, diaminobiphenyl and thienopyrazine; and x is 25 to 75. The catalyst provided by the invention has an extremely high specific surface area, provides a large number of active sites and has higher catalytic activity, and when the dosage of the catalyst is greater than 0.3 wt%, the hydrogenation degree of NBR can reach 91% or above through first catalysis.
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