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<p>Methanation, the process of producing methane from CO<sub>2</sub> and hydrogen via renewable energy sources, has attracted considerable attention. However, reducing the hydrogen content in the product methane gas remains a challenge for using this product gas as a city gas. To overcome this challenge, this study investigated the ethanol dehydration–hydrogenation reaction (C<sub>2</sub>H<sub>5</sub>OH + H<sub>2</sub> → C<sub>2</sub>H<sub>6</sub> + H<sub>2</sub>O) using ethanol, which is widely used as a biofuel, and hydrogen in the product methane gas. The reactions were performed under practical conditions using Pd and solid acid catalysts. It was confirmed that ethanol could be converted to ethane in high yields while the hydrogen content is reduced in the methane-rich gas. This study demonstrates the practical applicability of the ethanol dehydration-hydrogenation reaction to the methanation process to generate city gas.</p> Graphical Abstract <p></p>

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Reduction of the Hydrogen Content of CO2 Methanation Product Gas via Catalytic Ethanol Dehydration–Hydrogenation

  • 期刊论文

  • 发表日期：

    2025年1月18日

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  • Shimpei Norioka,
  • Tomoki Uchiyama,
  • Hirofumi Ohtsuka,
  • Yoshiharu Uchimoto

摘要

Methanation, the process of producing methane from CO2 and hydrogen via renewable energy sources, has attracted considerable attention. However, reducing the hydrogen content in the product methane gas remains a challenge for using this product gas as a city gas. To overcome this challenge, this study investigated the ethanol dehydration–hydrogenation reaction (C2H5OH + H2 → C2H6 + H2O) using ethanol, which is widely used as a biofuel, and hydrogen in the product methane gas. The reactions were performed under practical conditions using Pd and solid acid catalysts. It was confirmed that ethanol could be converted to ethane in high yields while the hydrogen content is reduced in the methane-rich gas. This study demonstrates the practical applicability of the ethanol dehydration-hydrogenation reaction to the methanation process to generate city gas.

Graphical Abstract