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<p>The utilization of red mud is a topic of significant interest due to its great production around the world, being the major by-product of alumina production. Nevertheless, its correct valorization is a matter of great complexity. In this work, we propose a novel use of red mud as a catalyst for the release of hydrogen from hydrolysis of ammonia borane in mild conditions. Ammonia borane is among the best chemical hydrogen carriers with a gravimetric hydrogen capability of up to 19 wt% but is characterized by a complex reactivity under thermal stimuli. Accordingly, ammonia borane hydrolysis has emerged as a solid route for direct and safe hydrogen release. In this work, we achieved complete hydrolysis of ammonia borane both at 30&#xa0;°C and 40&#xa0;°C after 660&#xa0;s and 12&#xa0;s, respectively, with a red mud loading of 10 wt%. The addition of red mud decreased the activation energy of the hydrolysis reaction over 90% and increased the kinetic constant over two orders of magnitude. Furthermore, red mud preserved the catalytic activity after three cycles with no significant changes.</p>

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Complex Waste Stream Utilization for Hydrogen Evolution: Ammonia Borane Hydrolysis Over Red Mud Catalyst Under Mild Conditions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月12日

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  • Mattia Bartoli,
  • Marco Etzi,
  • Stefania Lettieri,
  • Giuseppe Ferraro,
  • Candido Fabrizio Pirri,
  • Angelica Monica Chiodoni,
  • Sergio Bocchini

摘要

The utilization of red mud is a topic of significant interest due to its great production around the world, being the major by-product of alumina production. Nevertheless, its correct valorization is a matter of great complexity. In this work, we propose a novel use of red mud as a catalyst for the release of hydrogen from hydrolysis of ammonia borane in mild conditions. Ammonia borane is among the best chemical hydrogen carriers with a gravimetric hydrogen capability of up to 19 wt% but is characterized by a complex reactivity under thermal stimuli. Accordingly, ammonia borane hydrolysis has emerged as a solid route for direct and safe hydrogen release. In this work, we achieved complete hydrolysis of ammonia borane both at 30 °C and 40 °C after 660 s and 12 s, respectively, with a red mud loading of 10 wt%. The addition of red mud decreased the activation energy of the hydrolysis reaction over 90% and increased the kinetic constant over two orders of magnitude. Furthermore, red mud preserved the catalytic activity after three cycles with no significant changes.