Ammonia decomposition catalysts, honeycomb structures, and internal combustion engines

By using a barium-zirconium-ruthenium perovskite composite oxide catalyst, the problems of insufficient low-temperature activity and poor high-temperature heat resistance of existing ammonia decomposition catalysts have been solved, achieving efficient ammonia decomposition over a wide temperature range.

CN122094779APending Publication Date: 2026-05-26MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2024-10-29
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing ammonia decomposition catalysts have insufficient initial activity at low temperatures, poor heat resistance at high temperatures, and ruthenium tends to aggregate, leading to a decline in catalytic performance.

Method used

A perovskite-structured composite oxide composed of barium, zirconium, and ruthenium was used as an ammonia decomposition catalyst. By controlling the Ba/Zr ratio and Ru content, ruthenium was ensured to be solidly dissolved in the catalyst lattice, thereby improving dispersibility and stability.

Benefits of technology

It exhibits excellent initial ammonia decomposition activity at low temperatures and maintains stable catalytic performance at high temperatures, even maintaining a high ammonia conversion rate after heat treatment at 1200℃.

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Abstract

This disclosure relates to an ammonia decomposition catalyst comprising a composite oxide having a perovskite structure consisting of at least barium, zirconium, and ruthenium, a honeycomb structure comprising the ammonia decomposition catalyst, and an internal combustion engine equipped with the ammonia decomposition catalyst. According to this disclosure, an ammonia decomposition catalyst exhibiting excellent initial activity and heat resistance even at low temperatures, a honeycomb structure comprising the ammonia decomposition catalyst, and an internal combustion engine equipped with the ammonia decomposition catalyst can be provided.
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Citation Information

Patent Citations

  • Ammonia decomposition catalyst

    JP2010110697A

  • Ammonia decomposition system, internal combustion engine system, and ammonia decomposition method

    JP2024009392A