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<p>The increasing demand for hydrogen as an energy carrier requires new, more environmentally friendly production processes. While steam methane reforming is currently the predominant method, it causes high CO<sub>2</sub> emissions. As an alternative, water electrolysis offers a&#xa0;climate-neutral option, but it is associated with high energy requirements. Methane pyrolysis is a&#xa0;promising alternative because it converts methane into hydrogen and solid carbon in an oxygen-free environment without releasing CO<sub>2</sub>.</p><p>This study investigates the use of iron-silicon alloys as catalysts for methane pyrolysis in a&#xa0;liquid metal reactor. Three different alloys with 5, 10 and 15 mol% silicon are tested. The reaction takes place at 1200 °C in a&#xa0;molten iron bath with an excess of carbon to ensure stable process control. The experiments show that a&#xa0;higher silicon content significantly improves the hydrogen yield.</p><p>The hydrogen yields obtained are 28.58% for FeSi5, 38.52% for FeSi10 and 48.23% for FeSi15, corresponding to an almost linear increase in methane decomposition efficiency. Despite the carbon excess, no formation of cementite was detected, indicating stable process control. However, due to the short test duration of 55 min, long-term studies are required to evaluate the potential of these alloys for industrial application.</p>

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Einfluss des Siliziumgehalts in Eisen-Silizium-Schmelzen bei der Methanpyrolyse

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月12日

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  • Christoph Scherr,
  • David Scheiblehner,
  • Stefan Wibner,
  • David Neuschitzer,
  • Helmut Antrekowitsch

摘要

The increasing demand for hydrogen as an energy carrier requires new, more environmentally friendly production processes. While steam methane reforming is currently the predominant method, it causes high CO2 emissions. As an alternative, water electrolysis offers a climate-neutral option, but it is associated with high energy requirements. Methane pyrolysis is a promising alternative because it converts methane into hydrogen and solid carbon in an oxygen-free environment without releasing CO2.

This study investigates the use of iron-silicon alloys as catalysts for methane pyrolysis in a liquid metal reactor. Three different alloys with 5, 10 and 15 mol% silicon are tested. The reaction takes place at 1200 °C in a molten iron bath with an excess of carbon to ensure stable process control. The experiments show that a higher silicon content significantly improves the hydrogen yield.

The hydrogen yields obtained are 28.58% for FeSi5, 38.52% for FeSi10 and 48.23% for FeSi15, corresponding to an almost linear increase in methane decomposition efficiency. Despite the carbon excess, no formation of cementite was detected, indicating stable process control. However, due to the short test duration of 55 min, long-term studies are required to evaluate the potential of these alloys for industrial application.