Synthesis of ammonia catalyst, its preparation method and application

By using a Ru-based catalyst supported on SrTiO3 and with alkali metal or alkaline earth metal promoters, the problem of instability of ammonia synthesis catalysts under high temperature and high pressure was solved, achieving efficient ammonia synthesis under low temperature and low pressure, reducing energy consumption and cost, and making it suitable for industrial production.

CN117920204BActive Publication Date: 2026-07-21NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Filing Date
2024-01-18
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing ammonia synthesis catalysts operate under high temperature and high pressure conditions, resulting in high energy consumption. Furthermore, common supports are unstable or prone to moisture absorption in a hydrogen atmosphere, making it difficult to meet the requirements for efficient catalysis under low temperature and low pressure.

Method used

A catalyst was prepared by solvothermal reaction using SrTiO3 as the support, Ru as the active component, and alkali metals or alkaline earth metals as promoters. This improved the specific surface area and oxygen vacancy content of the catalyst, thereby enhancing the catalytic activity and stability of Ru/SrTiO3.

Benefits of technology

This method enables efficient ammonia synthesis at low temperature and low pressure, reducing energy consumption and costs in the industrial production of ammonia. The catalyst preparation method is simple and suitable for large-scale industrial production.

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Abstract

The application belongs to the technical field of synthetic ammonia and specifically relates to a synthetic ammonia catalyst, a preparation method and application thereof, wherein SrTiO3 is used as a carrier, Ru is used as an active component, and an alkali metal or an alkaline earth metal is used as an additive; the loading amount of Ru on the SrTiO3 is 1-10 wt%, and the alkali metal or the alkaline earth metal is added in an amount of 0.1-10 times the molar content of Ru; and the precursor of the alkaline earth metal is one or a combination of nitrate, carbonate, sulfate or halide of K, Rb, Cs and Ba. The catalyst has the advantages of simple preparation method, mild conditions, strong controllable performance, excellent carrier stability, low raw material cost and suitability for industrial mass production. When the catalyst is used in a synthetic ammonia reaction, the required pressure and temperature can be reduced, the reaction conditions are relatively mild, the reaction is easy to implement, the cost of industrialized production of synthetic ammonia is reduced, and therefore the catalyst is suitable for popularization and use.
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