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This publication focuses on catalytical solutions in after treatment systems (ATS) for heavy duty hydrogen internal combustion engines (HD-H2-ICE). To reduce NOx in the exhaust gas, SCR catalyst technology in combination with urea injection, well-known from Diesel application, can be used if the H2-ICE is running under lean conditions. As a supporting tool for the SCR catalyst, a NOx-Storage-Catalyst (NSC) is designed to store NOx at low temperatures (<150 °C) and provide optimized emission concentration for the SCR at operating temperatures (200 °C). Additionally, the NSC has H2-Oxidation function to remove possible hydrogen slip from the exhaust stream. Based on the SCR washcoat, the NSC can be designed to produce an optimized NO2/NOx ratio to enhance the NOx reduction efficiency of the SCR. A second concept to remove NOx is to use hydrogen as the reductant. Therefore, the engine should run periodically between lean and rich operation settings. On this case a Lean-NOx-Trap (LNT) in combination with a SCR can be used. Based on the used operation mode either the LNT or the SCR catalyst reduces NOx.

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Exhaust After Treatment Solutions for Heavy Duty Hydrogen Internal Combustion Engines to Reach Ultra-Low NOx Emissions

  • 会议论文

  • 发表日期：

    2025年

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  • Mirko Pfeifer,
  • Shahram Alijani,
  • Thomas Wolff,
  • David Berthout,
  • Loic Rouleau,
  • Bruno Walter,
  • Geoffrey Bourrachot

摘要

This publication focuses on catalytical solutions in after treatment systems (ATS) for heavy duty hydrogen internal combustion engines (HD-H2-ICE). To reduce NOx in the exhaust gas, SCR catalyst technology in combination with urea injection, well-known from Diesel application, can be used if the H2-ICE is running under lean conditions. As a supporting tool for the SCR catalyst, a NOx-Storage-Catalyst (NSC) is designed to store NOx at low temperatures (<150 °C) and provide optimized emission concentration for the SCR at operating temperatures (200 °C). Additionally, the NSC has H2-Oxidation function to remove possible hydrogen slip from the exhaust stream. Based on the SCR washcoat, the NSC can be designed to produce an optimized NO2/NOx ratio to enhance the NOx reduction efficiency of the SCR. A second concept to remove NOx is to use hydrogen as the reductant. Therefore, the engine should run periodically between lean and rich operation settings. On this case a Lean-NOx-Trap (LNT) in combination with a SCR can be used. Based on the used operation mode either the LNT or the SCR catalyst reduces NOx.