N2O decomposition catalyst

A SiO2-Al2O3 catalyst with iron support effectively decomposes N2O and NO in exhaust gases from ammonia fuel sources, addressing the challenge of water and sulfur oxide presence.

JP7841078B2Active Publication Date: 2026-04-06MITSUBISHI HEAVY IND LTD
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Patent Information

Application Number
JP2024512482
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-03-29
Filing Date
2023-03-27
Publication Date
2026-04-06
Estimated Expiration
2043-03-27

AI Technical Summary

Technical Problem

Existing catalysts are ineffective in decomposing nitrous oxide (N2O) and nitric oxide (NO) in exhaust gases from ammonia fuel combustion sources, particularly in the presence of water and sulfur oxides, which are common in coal-fired fluidized bed boilers, ammonia-fueled marine engines, and ammonia-fueled gas turbines.

Method used

A catalyst comprising SiO2 and Al2O3 support with an iron element, characterized by specific pyridine desorption profiles and crystallite size, promoting N2O and NO decomposition even in the presence of water and sulfur oxides.

Benefits of technology

The catalyst effectively decomposes N2O and NO in exhaust gases with high water and sulfur oxide content, maintaining high decomposition rates after exposure to harsh conditions.

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Patent Text Reader

Abstract

Provided are: a catalyst containing a carrier including SiO2 and Al2O3 and an iron element carried on the carrier, having a total amount of desorbed pyridine of 100 μmol or more with respect to 1 g catalyst within the range of 150℃ inclusive to 450℃ exclusive in the TPD spectrum, and configured to promote the decomposition reaction of nitrogen monoxide and nitric monoxide; and a method for reducing nitrogen monoxide and nitric monoxide in a gas containing water and / or a sulfur oxide, nitrogen monoxide, and nitric monoxide, the method comprising bringing a gas and a reductant into contact with the catalyst to decompose nitrogen monoxide and nitric monoxide, the gas containing water and / or a sulfur oxide, nitrogen monoxide, and nitric monoxide.
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Citation Information

Patent Citations

  • Denitrification catalyst for high temperature waste gas

    JP1991296436A

  • Method for removing nitrous oxide in exhaust gas and catalyst for removing the same

    JP1996057262A

  • A zeolite catalyst supported with iron ions, a method for producing the same, and a method for reducing nitrous oxide alone or both nitrous oxide and nitric oxide simultaneously using an ammonia reducing agent with the catalyst.

    JP2012521288A

  • Organotemplate-free synthetic process for production of zeolitic material

    JP2013049624A

  • Novel metal-containing zeolite beta for NOx reduction

    JP2013526406A