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<p>In various heterogeneous catalytic processes, the active sites are often composed of two or more metal elements to balance activity, selectivity and durability. However, precisely controlling the compositions of supported bimetallic or multi-metallic clusters and maintaining their stability under high-temperature reaction conditions presents a substantial challenge. Here we show that the migration of K and Sn species during ethane dehydrogenation over multiple reaction–regeneration cycles aggravates the compositional heterogeneity of K–Pt–Sn clusters encapsulated within MFI zeolite, thereby promoting coke formation and accelerating catalyst deactivation. Through a water-soaking treatment, we achieve the redistribution of K and Sn species within the MFI zeolite, thereby constructing sub-nanometre K–Pt–Sn active sites with optimal composition. The resulting catalyst delivers high ethylene yields, ethylene selectivity above 99%, and a stable lifetime of over 3,600 h over multiple reaction–regeneration cycles.</p><p></p>

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Managing the atom migration in zeolite-encapsulated K–Pt–Sn clusters for non-oxidative dehydrogenation of ethane

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Zhe He,
  • Wenying Li,
  • Tianxiang Chen,
  • Carlo Marini,
  • Miguel Lopez Haro,
  • Hai Xiao,
  • Lichen Liu

摘要

In various heterogeneous catalytic processes, the active sites are often composed of two or more metal elements to balance activity, selectivity and durability. However, precisely controlling the compositions of supported bimetallic or multi-metallic clusters and maintaining their stability under high-temperature reaction conditions presents a substantial challenge. Here we show that the migration of K and Sn species during ethane dehydrogenation over multiple reaction–regeneration cycles aggravates the compositional heterogeneity of K–Pt–Sn clusters encapsulated within MFI zeolite, thereby promoting coke formation and accelerating catalyst deactivation. Through a water-soaking treatment, we achieve the redistribution of K and Sn species within the MFI zeolite, thereby constructing sub-nanometre K–Pt–Sn active sites with optimal composition. The resulting catalyst delivers high ethylene yields, ethylene selectivity above 99%, and a stable lifetime of over 3,600 h over multiple reaction–regeneration cycles.