Exhaust gas emission reduction system

JP7863519B2Active Publication Date: 2026-05-21SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Natural gas engines emit unburned methane (CH4), a potent greenhouse gas, due to incomplete combustion, which adversely affects the performance and lifespan of methane oxidation catalysts (MOCs) used for emission reduction, as catalyst poisons like SO2, P, Zn, Ca, and Si deactivate the MOCs.

Method used

A double-bed methane reduction system with a guard bed upstream of the MOC bed, using transition metal oxides and aluminum oxide carriers, effectively removes catalyst poisons before the exhaust gas reaches the MOC, maintaining its catalytic activity and extending its lifespan.

Benefits of technology

The system significantly reduces CH4 emissions to below 200 ppmv, ensuring compliance with emission standards and preserving the MOC's performance by capturing and converting catalyst poisons, thereby enhancing the overall efficiency and longevity of the emission reduction process.

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Patent Text Reader

Abstract

A system for removing methane oxidation catalyst (MOC) poisons from an exhaust gas includes a methane abatement unit capable of receiving an exhaust gas containing methane (CH4) and MOC poisons. The methane abatement unit includes a guard bed capable of removing MOC poisons from the exhaust gas and generating an intermediate exhaust gas containing CH4 and free of MOC poisons. The guard bed includes an MOC poison capture component having a first transition metal oxide, an aluminum oxide (Al2O3) support material, and a dolomite-derived support material. The methane abatement unit also includes an MOC bed fluidly coupled to and positioned downstream of the guard bed. The MOC bed includes MOC and is capable of removing CH4 from the intermediate exhaust gas to generate a treated exhaust gas having less than about 200 parts per million by volume (ppmv) of CH4.
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Citation Information

Patent Citations

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