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<p>Ammonia decomposition is a key reaction in the green hydrogen economy because ammonia is an important carbon-free hydrogen carrier. In contrast to the prevalent focus on developing active catalysts to address the reaction’s slow kinetics at low temperatures, we introduce a tungsten wire lightbulb reactor that operates at unconventionally locally high temperatures while maintaining enhanced efficiency. Near the wire, the local temperature reaches up to 1,800 K, enabling ultrafast ammonia decomposition with rate constants much higher than those of leading catalysts under typical reaction conditions. Concurrently, the sharp temperature decrease along the radial direction allows for low power input, thus enhancing energy efficiency. The lightbulb reactor also realized up to 99.995% conversion at enhanced power input without the use of additional separation steps. We further propose a scaled-up reactor design that is two to three orders of magnitude smaller than current state-of-the-art reactors and highlight its potential applications within the emerging hydrogen economy.</p><p></p>

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Ultrafast ammonia decomposition using an electrified tungsten wire lightbulb reactor

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Keshia Saradima Indriadi,
  • Sie Shing Wong,
  • Peijie Han,
  • Sikai Wang,
  • Di Xu,
  • Ning Yan

摘要

Ammonia decomposition is a key reaction in the green hydrogen economy because ammonia is an important carbon-free hydrogen carrier. In contrast to the prevalent focus on developing active catalysts to address the reaction’s slow kinetics at low temperatures, we introduce a tungsten wire lightbulb reactor that operates at unconventionally locally high temperatures while maintaining enhanced efficiency. Near the wire, the local temperature reaches up to 1,800 K, enabling ultrafast ammonia decomposition with rate constants much higher than those of leading catalysts under typical reaction conditions. Concurrently, the sharp temperature decrease along the radial direction allows for low power input, thus enhancing energy efficiency. The lightbulb reactor also realized up to 99.995% conversion at enhanced power input without the use of additional separation steps. We further propose a scaled-up reactor design that is two to three orders of magnitude smaller than current state-of-the-art reactors and highlight its potential applications within the emerging hydrogen economy.