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<p>Precise stabilization of atomic structures under reaction environments remains a central challenge in heterogeneous catalysis. Here, we demonstrate that ammonia (NH<sub>3</sub>) serves as a chemically active nitrogen source to derive the selective migration of ruthenium (Ru) atoms onto ceria (CeO<sub>2</sub>) domains, forming a durable atomically dispersed structure. During ammonia decomposition, nitrogen-containing intermediates promote atomic redistribution of Ru and anchor the atoms selectively at CeO<sub>2</sub>, yielding stable Ru-ceria interfaces. The resulting catalyst exhibits high activity in high-pressure ammonia decomposition for hydrogen production, attributed to its lowered activation energy and mitigated hydrogen poisoning. Furthermore, both the catalytic performance and the atomic Ru structure are preserved during long-term high-pressure operation, confirming the exceptional structural stability of the designed configuration. This study establishes active-nitrogen-driven migration as an effective strategy for constructing robust and reaction-friendly catalyst surface.</p>

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Active nitrogen mediated selective ruthenium migration on ceria for high pressure ammonia decomposition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Gunjoo Kim,
  • Gahong Kim,
  • Hyunsik Hwang,
  • Eunseong Yoo,
  • Jae-eon Hwang,
  • Jae Won Lee,
  • Hae Ryeong Lee,
  • Keunsoo Kim,
  • Hyangsoo Jeong,
  • Yongmin Kim,
  • Suk Woo Nam,
  • Sungeun Yang,
  • Andreas T. Güntner,
  • Hyunjoo Lee,
  • Keun Hwa Chae,
  • Hyung Chul Ham,
  • Hyuntae Sohn

摘要

Precise stabilization of atomic structures under reaction environments remains a central challenge in heterogeneous catalysis. Here, we demonstrate that ammonia (NH3) serves as a chemically active nitrogen source to derive the selective migration of ruthenium (Ru) atoms onto ceria (CeO2) domains, forming a durable atomically dispersed structure. During ammonia decomposition, nitrogen-containing intermediates promote atomic redistribution of Ru and anchor the atoms selectively at CeO2, yielding stable Ru-ceria interfaces. The resulting catalyst exhibits high activity in high-pressure ammonia decomposition for hydrogen production, attributed to its lowered activation energy and mitigated hydrogen poisoning. Furthermore, both the catalytic performance and the atomic Ru structure are preserved during long-term high-pressure operation, confirming the exceptional structural stability of the designed configuration. This study establishes active-nitrogen-driven migration as an effective strategy for constructing robust and reaction-friendly catalyst surface.